Lemma 1
Let \(\mathfrak{F}:[\sigma _{1},\sigma _{2}]\rightarrow \mathbb{R} \) be an absolutely continuous map** on \((\sigma _{1},\sigma _{2})\) so that \(\mathfrak{F}^{\prime }\in L_{1} [ \sigma _{1},\sigma _{2} ] \). Then, the following equality holds:
$$\begin{aligned} & \frac{1}{8} \biggl[ \mathfrak{F} ( \sigma _{1} ) +3 \mathfrak{F} \biggl( \frac{2\sigma _{1}+\sigma _{2}}{3} \biggr) +3\mathfrak{F} \biggl( \frac{\sigma _{1}+2\sigma _{2}}{3} \biggr) +\mathfrak{F} ( \sigma _{2} ) \biggr] \\ & \quad - \frac{\Gamma ( \alpha ) }{2\curlyvee _{\lambda } ( \alpha ,\sigma _{2}-\sigma _{1} ) } \bigl[ \mathcal{J}_{\sigma _{1}+}^{ ( \alpha ,\lambda ) } \mathfrak{F} ( \sigma _{2} ) +\mathcal{J}_{\sigma _{2}-}^{ ( \alpha ,\lambda ) }\mathfrak{F} ( \sigma _{1} ) \bigr] = \frac{ ( \sigma _{2}-\sigma _{1} ) ^{\alpha +1}}{2\curlyvee _{\lambda } ( \alpha ,\sigma _{2}-\sigma _{1} ) } \sum ^{3}_{i=1}I_{i}. \end{aligned}$$
(7)
Here,
$$ \textstyle\begin{cases} I_{1}=\int _{0}^{\frac{1}{3}} \{ \curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,\mu ) - \frac{1}{8}\curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,1 ) \}\\ \hphantom{I_{1}}\quad \times [ \mathfrak{F}^{\prime } ( \mu \sigma _{2}+ ( 1-\mu ) \sigma _{1} ) - \mathfrak{F}^{\prime } ( \mu \sigma _{1}+ ( 1-\mu ) \sigma _{2} ) ] \,d\mu , \\ I_{2}=\int _{\frac{1}{3}}^{\frac{2}{3}} \{ \curlyvee _{ \lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,\mu ) -\frac{1}{2}\curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,1 ) \} \\ \hphantom{I_{1}}\quad \times [ \mathfrak{F}^{\prime } ( \mu \sigma _{2}+ ( 1-\mu ) \sigma _{1} ) - \mathfrak{F}^{\prime } ( \mu \sigma _{1}+ ( 1-\mu ) \sigma _{2} ) ] \,d\mu , \\ I_{3}=\int _{\frac{2}{3}}^{1} \{ \curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,\mu ) - \frac{7}{8}\curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,1 ) \} \\ \hphantom{I_{1}}\quad \times [ \mathfrak{F}^{\prime } ( \mu \sigma _{2}+ ( 1-\mu ) \sigma _{1} ) - \mathfrak{F}^{\prime } ( \mu \sigma _{1}+ ( 1-\mu ) \sigma _{2} ) ] \,d\mu .\end{cases} $$
Proof
From fundamental rules of integration by parts, we have
$$\begin{aligned} I_{1}& = \int _{0}^{\frac{1}{3}} \biggl\{ \curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,\mu ) - \frac{1}{8}\curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,1 ) \biggr\} \\ &\quad \times\bigl[ \mathfrak{F}^{\prime } \bigl( \mu \sigma _{2}+ ( 1-\mu ) \sigma _{1} \bigr) - \mathfrak{F}^{\prime } \bigl( \mu \sigma _{1}+ ( 1-\mu ) \sigma _{2} \bigr) \bigr] \,d\mu \\ & =\frac{1}{\sigma _{2}-\sigma _{1}} \biggl\{ \curlyvee _{ \lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,\mu ) -\frac{1}{8}\curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,1 ) \biggr\} \\ &\quad \times\bigl[ \mathfrak{F} \bigl( \mu \sigma _{2}+ ( 1-\mu ) \sigma _{1} \bigr) +\mathfrak{F} \bigl( \mu \sigma _{1}+ ( 1- \mu ) \sigma _{2} \bigr) \bigr] \bigg\vert _{0}^{\frac{1}{3}} \\ & \quad -\frac{\alpha }{\sigma _{2}-\sigma _{1}} \int _{0}^{ \frac{1}{3}}\mu ^{\alpha -1}e^{-\lambda (\sigma _{2}-\sigma _{1})\mu } \bigl[ \mathfrak{F} \bigl( \mu \sigma _{2}+ ( 1-\mu ) \sigma _{1} \bigr) + \mathfrak{F} \bigl( \mu \sigma _{1}+ ( 1-\mu ) \sigma _{2} \bigr) \bigr] \,d\mu \\ & =\frac{1}{\sigma _{2}-\sigma _{1}} \biggl\{ \curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } \biggl( \alpha , \frac{1}{3} \biggr) -\frac{1}{8}\curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,1 ) \biggr\} \biggl[ \mathfrak{F} \biggl( \frac{2\sigma _{1}+\sigma _{2}}{3} \biggr) + \mathfrak{F} \biggl( \frac{\sigma _{1}+2\sigma _{2}}{3} \biggr) \biggr] \\ & \quad +\frac{1}{8 ( \sigma _{2}-\sigma _{1} ) } \curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,1 ) \bigl[ \mathfrak{F} ( \sigma _{1} ) + \mathfrak{F} ( \sigma _{2} ) \bigr] \\ & \quad -\frac{1}{\sigma _{2}-\sigma _{1}} \int _{0}^{ \frac{1}{3}}\mu ^{\alpha -1}e^{-\lambda (\sigma _{2}-\sigma _{1})\mu } \bigl[ \mathfrak{F} \bigl( \mu \sigma _{2}+ ( 1-\mu ) \sigma _{1} \bigr) + \mathfrak{F} \bigl( \mu \sigma _{1}+ ( 1-\mu ) \sigma _{2} \bigr) \bigr] \,d \mu . \end{aligned}$$
(8)
In a similar manner, applying the fundamental rules of integration by parts, we obtain
$$\begin{aligned} I_{2}& =\frac{1}{\sigma _{2}-\sigma _{1}} \biggl\{ \curlyvee _{ \lambda ( \sigma _{2}-\sigma _{1} ) } \biggl( \alpha , \frac{2}{3} \biggr) -\frac{1}{2}\curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,1 ) \biggr\} \\ &\quad \times\biggl[ \mathfrak{F} \biggl( \frac{2\sigma _{1}+\sigma _{2}}{3} \biggr) +\mathfrak{F} \biggl( \frac{\sigma _{1}+2\sigma _{2}}{3} \biggr) \biggr] \\ & \quad -\frac{1}{ ( \sigma _{2}-\sigma _{1} ) } \biggl\{ \curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } \biggl( \alpha ,\frac{1}{3} \biggr) -\frac{1}{2}\curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,1 ) \biggr\} \\ &\quad \times\biggl[ \mathfrak{F} \biggl( \frac{2\sigma _{1}+\sigma _{2}}{3} \biggr) +\mathfrak{F} \biggl( \frac{\sigma _{1}+2\sigma _{2}}{3} \biggr) \biggr] \\ & \quad -\frac{1}{\sigma _{2}-\sigma _{1}} \int _{\frac{1}{3}}^{ \frac{2}{3}}\mu ^{\alpha -1}e^{-\lambda (\sigma _{2}-\sigma _{1})\mu } \bigl[ \mathfrak{F} \bigl( \mu \sigma _{2}+ ( 1-\mu ) \sigma _{1} \bigr) +\mathfrak{F} \bigl( \mu \sigma _{1}+ ( 1-\mu ) \sigma _{2} \bigr) \bigr] \,d\mu \end{aligned}$$
(9)
and
$$\begin{aligned} I_{3}& =\frac{1}{8 ( \sigma _{2}-\sigma _{1} ) }\curlyvee _{ \lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,1 ) \bigl[ \mathfrak{F} ( \sigma _{1} ) + \mathfrak{F} ( \sigma _{2} ) \bigr] \\ & \quad -\frac{1}{\sigma _{2}-\sigma _{1}} \biggl\{ \curlyvee _{ \lambda ( \sigma _{2}-\sigma _{1} ) } \biggl( \alpha , \frac{2}{3} \biggr) -\frac{7}{8}\curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,1 ) \biggr\} \biggl[ \mathfrak{F} \biggl( \frac{2\sigma _{1}+\sigma _{2}}{3} \biggr) +\mathfrak{F} \biggl( \frac{\sigma _{1}+2\sigma _{2}}{3} \biggr) \biggr] \\ & \quad -\frac{1}{\sigma _{2}-\sigma _{1}} \int _{\frac{2}{3}}^{ \frac{1}{3}}\mu ^{\alpha -1}e^{-\lambda (\sigma _{2}-\sigma _{1})\mu } \\ &\quad \times\bigl[ \mathfrak{F} \bigl( \mu \sigma _{2}+ ( 1-\mu ) \sigma _{1} \bigr) +\mathfrak{F} \bigl( \mu \sigma _{1}+ ( 1-\mu ) \sigma _{2} \bigr) \bigr] \,d\mu . \end{aligned}$$
(10)
Let us collect from the equality (8) to (10). Then, it yields
$$\begin{aligned} \sum^{3}_{i=1}I_{i}& = \frac{\curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,\sigma _{2}-\sigma _{1} ) }{4 ( \sigma _{2}-\sigma _{1} ) ^{\alpha +1}} \biggl[ \mathfrak{F} ( \sigma _{1} ) +3 \mathfrak{F} \biggl( \frac{2\sigma _{1}+\sigma _{2}}{3} \biggr) +3\mathfrak{F} \biggl( \frac{\sigma _{1}+2\sigma _{2}}{3} \biggr) +\mathfrak{F} ( \sigma _{2} ) \biggr] \\ & \quad -\frac{1}{\sigma _{2}-\sigma _{1}} \int _{0}^{1}\mu ^{ \alpha -1}e^{-\lambda (\sigma _{2}-\sigma _{1})\mu } \\ &\quad \times\bigl[ \mathfrak{F} \bigl( \mu \sigma _{2}+ ( 1-\mu ) \sigma _{1} \bigr) +\mathfrak{F} \bigl( \mu \sigma _{1}+ ( 1- \mu ) \sigma _{2} \bigr) \bigr] \,d\mu . \end{aligned}$$
(11)
By using the equality (11) and with the help of the change of the variable \(x=\mu \sigma _{2}+ ( 1-\mu ) \sigma _{1}\) and \(x=\mu \sigma _{1}+ ( 1-\mu ) \sigma _{2}\) for \(\mu \in [ 0,1 ] \) respectively, it can be rewritten as follows
$$\begin{aligned} \sum^{3}_{i=1}I_{i}& = \frac{\curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,\sigma _{2}-\sigma _{1} ) }{4 ( \sigma _{2}-\sigma _{1} ) ^{\alpha +1}} \biggl[ \mathfrak{F} ( \sigma _{1} ) +3 \mathfrak{F} \biggl( \frac{2\sigma _{1}+\sigma _{2}}{3} \biggr) +3\mathfrak{F} \biggl( \frac{\sigma _{1}+2\sigma _{2}}{3} \biggr) +\mathfrak{F} ( \sigma _{2} ) \biggr] \\ & \quad - \frac{\Gamma ( \alpha ) }{ ( \sigma _{2}-\sigma _{1} ) ^{\alpha +1}} \bigl[ \mathcal{J}_{\sigma _{2}-}^{ ( \alpha ,\lambda ) } \mathfrak{F} ( \sigma _{1} ) +\mathcal{J}_{\sigma _{1}+}^{ ( \alpha ,\lambda ) } \mathfrak{F} ( \sigma _{2} ) \bigr] . \end{aligned}$$
(12)
If we multiply both sides of (12) by \(\frac{ ( \sigma _{2}-\sigma _{1} ) ^{\alpha +1}}{2\curlyvee _{\lambda } ( \alpha ,\sigma _{2}-\sigma _{1} ) }\), then the equality (7) is obtained readily. This finishes the proof of Lemma 1. □
Theorem 3
Let us consider that the assumptions of Lemma 1are valid and the function \(\vert \mathfrak{F}^{\prime } \vert \) is convex on \([ \sigma _{1},\sigma _{2} ] \). Then, the following Newton’s rule inequality holds:
$$\begin{aligned} & \biggl\vert \frac{1}{8} \biggl[ \mathfrak{F} ( \sigma _{1} ) +3\mathfrak{F} \biggl( \frac{2\sigma _{1}+\sigma _{2}}{3} \biggr) +3 \mathfrak{F} \biggl( \frac{\sigma _{1}+2\sigma _{2}}{3} \biggr) + \mathfrak{F} ( \sigma _{2} ) \biggr] \\ &\qquad - \frac{\Gamma ( \alpha ) }{2\curlyvee _{\lambda } ( \alpha ,\sigma _{2}-\sigma _{1} ) } \bigl[ \mathcal{J}_{\sigma _{1}+}^{ ( \alpha ,\lambda ) } \mathfrak{F} ( \sigma _{2} ) +\mathcal{J}_{\sigma _{2}-}^{ ( \alpha ,\lambda ) }\mathfrak{F} ( \sigma _{1} ) \bigr] \biggr\vert \\ &\quad \leq \frac{ ( \sigma _{2}-\sigma _{1} ) ^{\alpha +1}}{2\curlyvee _{\lambda } ( \alpha ,\sigma _{2}-\sigma _{1} ) } \bigl( \Omega _{1} ( \alpha ,\lambda ) +\Omega _{2} ( \alpha ,\lambda ) +\Omega _{3} ( \alpha ,\lambda ) \bigr) \bigl[ \bigl\vert \mathfrak{F}^{\prime } ( \sigma _{1} ) \bigr\vert + \bigl\vert \mathfrak{F}^{\prime } ( \sigma _{2} ) \bigr\vert \bigr] , \end{aligned}$$
(13)
where
$$ \textstyle\begin{cases} \Omega _{1} ( \alpha ,\lambda ) =\int _{0}^{ \frac{1}{3}} \vert \curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,\mu ) -\frac{1}{8}\curlyvee _{ \lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,1 ) \vert \,d\mu , \\ \Omega _{2} ( \alpha ,\lambda ) =\int _{ \frac{1}{3}}^{\frac{2}{3}} \vert \curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,\mu ) -\frac{1}{2}\curlyvee _{ \lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,1 ) \vert \,d\mu , \\ \Omega _{3} ( \alpha ,\lambda ) =\int _{ \frac{2}{3}}^{1} \vert \curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,\mu ) -\frac{7}{8}\curlyvee _{ \lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,1 ) \vert \,d\mu .\end{cases} $$
(14)
Proof
We shall first take modulus in Lemma 1. Then, we get
$$\begin{aligned} & \bigg\vert \frac{1}{8} \biggl[ \mathfrak{F} ( \sigma _{1} ) +3\mathfrak{F} \biggl( \frac{2\sigma _{1}+\sigma _{2}}{3} \biggr) +3 \mathfrak{F} \biggl( \frac{\sigma _{1}+2\sigma _{2}}{3} \biggr) + \mathfrak{F} ( \sigma _{2} ) \biggr] \\ & \qquad - \frac{\Gamma ( \alpha ) }{2\curlyvee _{\lambda } ( \alpha ,\sigma _{2}-\sigma _{1} ) } \bigl[ \mathcal{J}_{\sigma _{1}+}^{ ( \alpha ,\lambda ) } \mathfrak{F} ( \sigma _{2} ) +\mathcal{J}_{\sigma _{2}-}^{ ( \alpha ,\lambda ) }\mathfrak{F} ( \sigma _{1} ) \bigr] \bigg\vert \\ & \quad \leq \frac{ ( \sigma _{2}-\sigma _{1} ) ^{\alpha +1}}{2\curlyvee _{\lambda } ( \alpha ,\sigma _{2}-\sigma _{1} ) } \\ & \qquad \times \bigg\{ \int _{0}^{\frac{1}{3}} \biggl\vert \curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,\mu ) -\frac{1}{8}\curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,1 ) \biggr\vert \\ &\qquad \times\bigl\vert \mathfrak{F}^{ \prime } \bigl( \mu \sigma _{2}+ ( 1-\mu ) \sigma _{1} \bigr) - \mathfrak{F}^{\prime } \bigl( \mu \sigma _{1}+ ( 1- \mu ) \sigma _{2} \bigr) \bigr\vert \,d\mu \\ & \qquad + \int _{\frac{1}{3}}^{\frac{2}{3}} \biggl\vert \curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,\mu ) -\frac{1}{2}\curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,1 ) \biggr\vert \\ &\qquad \times\bigl\vert \mathfrak{F}^{\prime } \bigl( \mu \sigma _{2}+ ( 1-\mu ) \sigma _{1} \bigr) -\mathfrak{F}^{\prime } \bigl( \mu \sigma _{1}+ ( 1-\mu ) \sigma _{2} \bigr) \bigr\vert \,d\mu \\ & \qquad + \int _{\frac{2}{3}}^{1} \biggl\vert \curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,\mu ) -\frac{7}{8}\curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,1 ) \biggr\vert \\ &\qquad \times\bigl\vert \mathfrak{F}^{ \prime } \bigl( \mu \sigma _{2}+ ( 1-\mu ) \sigma _{1} \bigr) - \mathfrak{F}^{\prime } \bigl( \mu \sigma _{1}+ ( 1- \mu ) \sigma _{2} \bigr) \bigr\vert \,d\mu \bigg\} . \end{aligned}$$
(15)
With the aid of the convexity of \(\vert \mathfrak{F}^{\prime } \vert \), it follows
$$\begin{aligned} & \biggl\vert \frac{1}{8} \biggl[ \mathfrak{F} ( \sigma _{1} ) +3\mathfrak{F} \biggl( \frac{2\sigma _{1}+\sigma _{2}}{3} \biggr) +3 \mathfrak{F} \biggl( \frac{\sigma _{1}+2\sigma _{2}}{3} \biggr) + \mathfrak{F} ( \sigma _{2} ) \biggr] \\ & \qquad - \frac{\Gamma ( \alpha +1 ) }{2 ( \sigma _{2}-\sigma _{1} ) ^{\alpha }} \bigl[ J_{\sigma _{1}+}^{\alpha } \mathfrak{F} ( \sigma _{2} ) +J_{\sigma _{2}-}^{\alpha } \mathfrak{F} ( \sigma _{1} ) \bigr] \biggr\vert \\ &\quad \leq \frac{ ( \sigma _{2}-\sigma _{1} ) ^{\alpha +1}}{2\curlyvee _{\lambda } ( \alpha ,\sigma _{2}-\sigma _{1} ) } \biggl\{ \int _{0}^{\frac{1}{3}} \biggl\vert \curlyvee _{ \lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,\mu ) -\frac{1}{8}\curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,1 ) \biggr\vert \\ & \qquad \times \bigl[ \mu \bigl\vert \mathfrak{F}^{\prime } ( \sigma _{2} ) \bigr\vert + ( 1-\mu ) \bigl\vert \mathfrak{F}^{\prime } ( \sigma _{1} ) \bigr\vert +\mu \bigl\vert \mathfrak{F}^{\prime } ( \sigma _{1} ) \bigr\vert + ( 1-\mu ) \bigl\vert \mathfrak{F}^{\prime } ( \sigma _{2} ) \bigr\vert \bigr] \,d\mu \\ & \qquad + \int _{\frac{1}{3}}^{\frac{2}{3}} \biggl\vert \curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,\mu ) -\frac{1}{2}\curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,1 ) \biggr\vert \\ & \qquad \times \bigl[ \mu \bigl\vert \mathfrak{F}^{\prime } ( \sigma _{2} ) \bigr\vert + ( 1-\mu ) \bigl\vert \mathfrak{F}^{\prime } ( \sigma _{1} ) \bigr\vert +\mu \bigl\vert \mathfrak{F}^{\prime } ( \sigma _{1} ) \bigr\vert + ( 1-\mu ) \bigl\vert \mathfrak{F}^{\prime } ( \sigma _{2} ) \bigr\vert \bigr] \,d\mu \\ & \qquad + \int _{\frac{2}{3}}^{1} \biggl\vert \curlyvee _{ \lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,\mu ) -\frac{7}{8}\curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,1 ) \biggr\vert \\ & \qquad \times \bigl[ \mu \bigl\vert \mathfrak{F}^{\prime } ( \sigma _{2} ) \bigr\vert + ( 1-\mu ) \bigl\vert \mathfrak{F}^{\prime } ( \sigma _{1} ) \bigr\vert +\mu \bigl\vert \mathfrak{F}^{\prime } ( \sigma _{1} ) \bigr\vert + ( 1-\mu ) \bigl\vert \mathfrak{F}^{\prime } ( \sigma _{2} ) \bigr\vert \bigr] \,d\mu \biggr\} \\ & \quad = \frac{ ( \sigma _{2}-\sigma _{1} ) ^{\alpha +1}}{2\curlyvee _{\lambda } ( \alpha ,\sigma _{2}-\sigma _{1} ) } \bigl( \Omega _{1} ( \alpha ,\lambda ) + \Omega _{2} ( \alpha ,\lambda ) +\Omega _{3} ( \alpha , \lambda ) \bigr) \bigl[ \bigl\vert \mathfrak{F}^{\prime } ( \sigma _{1} ) \bigr\vert + \bigl\vert \mathfrak{F}^{\prime } ( \sigma _{2} ) \bigr\vert \bigr] . \end{aligned}$$
This completes the proof of Theorem 3. □
Theorem 4
Suppose that the assumptions of Lemma 1hold. Suppose also that the function \(\vert \mathfrak{F}^{\prime } \vert ^{q}\), \(q>1\) is convex on \([\sigma _{1},\sigma _{2}]\). Then, we have the following Newton’s rule inequality
$$\begin{aligned} & \biggl\vert \frac{1}{8} \biggl[ \mathfrak{F} ( \sigma _{1} ) +3\mathfrak{F} \biggl( \frac{2\sigma _{1}+\sigma _{2}}{3} \biggr) +3 \mathfrak{F} \biggl( \frac{\sigma _{1}+2\sigma _{2}}{3} \biggr) + \mathfrak{F} ( \sigma _{2} ) \biggr] \\ &\qquad - \frac{\Gamma ( \alpha ) }{2\curlyvee _{\lambda } ( \alpha ,\sigma _{2}-\sigma _{1} ) } \bigl[ \mathcal{J}_{\sigma _{1}+}^{ ( \alpha ,\lambda ) } \mathfrak{F} ( \sigma _{2} ) +\mathcal{J}_{\sigma _{2}-}^{ ( \alpha ,\lambda ) }\mathfrak{F} ( \sigma _{1} ) \bigr] \biggr\vert \\ & \quad \leq \frac{ ( \sigma _{2}-\sigma _{1} ) ^{\alpha +1}}{2\curlyvee _{\lambda } ( \alpha ,\sigma _{2}-\sigma _{1} ) } \biggl\{ \bigl( \varphi _{1} ( \alpha ,\lambda ,p ) + \varphi _{3} ( \alpha ,\lambda ,p ) \bigr) \\ & \qquad \times \biggl[ \biggl( \frac{5 \vert \mathfrak{F}^{\prime } ( \sigma _{1} ) \vert ^{q}+ \vert \mathfrak{F}^{\prime } ( \sigma _{2} ) \vert ^{q}}{18} \biggr) ^{\frac{1}{q}}+ \biggl( \frac{ \vert \mathfrak{F}^{\prime } ( \sigma _{1} ) \vert ^{q}+5 \vert \mathfrak{F}^{\prime } ( \sigma _{2} ) \vert ^{q}}{18} \biggr) ^{\frac{1}{q}} \biggr] \\ & \qquad +2\varphi _{2} ( \alpha ,\lambda ,p ) \biggl( \frac{ \vert \mathfrak{F}^{\prime } ( \sigma _{1} ) \vert ^{q}+ \vert \mathfrak{F}^{\prime } ( \sigma _{2} ) \vert ^{q}}{6} \biggr) ^{\frac{1}{q}} \biggr\} . \end{aligned}$$
Here, \(\frac{1}{p}+\frac{1}{q}=1\) and
$$ \textstyle\begin{cases} \varphi _{1} ( \alpha ,\lambda ,p ) = ( \int _{0}^{ \frac{1}{3}} \vert \curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,\mu ) -\frac{1}{8}\curlyvee _{ \lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,1 ) \vert ^{p}\,d\mu ) ^{\frac{1}{p}}, \\ \varphi _{2} ( \alpha ,\lambda ,p ) = ( \int _{ \frac{1}{3}}^{\frac{2}{3}} \vert \curlyvee _{\lambda ( \sigma _{2}- \sigma _{1} ) } ( \alpha ,\mu ) -\frac{1}{2} \curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,1 ) \vert ^{p}\,d\mu ) ^{\frac{1}{p}}, \\ \varphi _{3} ( \alpha ,\lambda ,p ) = ( \int _{ \frac{2}{3}}^{1} \vert \curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,\mu ) -\frac{7}{8}\curlyvee _{ \lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,1 ) \vert ^{p}\,d\mu ) ^{\frac{1}{p}}.\end{cases} $$
Proof
Now, applying Hölder inequality in inequality (15), it follows
$$\begin{aligned} & \bigg\vert \frac{1}{8} \biggl[ \mathfrak{F} ( \sigma _{1} ) +3\mathfrak{F} \biggl( \frac{2\sigma _{1}+\sigma _{2}}{3} \biggr) +3 \mathfrak{F} \biggl( \frac{\sigma _{1}+2\sigma _{2}}{3} \biggr) + \mathfrak{F} ( \sigma _{2} ) \biggr] \\ &\qquad - \frac{\Gamma ( \alpha ) }{2\curlyvee _{\lambda } ( \alpha ,\sigma _{2}-\sigma _{1} ) } \bigl[ \mathcal{J}_{\sigma _{1}+}^{ ( \alpha ,\lambda ) } \mathfrak{F} ( \sigma _{2} ) +\mathcal{J}_{\sigma _{2}-}^{ ( \alpha ,\lambda ) }\mathfrak{F} ( \sigma _{1} ) \bigr] \bigg\vert \\ & \quad \leq \frac{ ( \sigma _{2}-\sigma _{1} ) ^{\alpha +1}}{2\curlyvee _{\lambda } ( \alpha ,\sigma _{2}-\sigma _{1} ) } \\ &\qquad \times \bigg\{ \biggl( \int _{0}^{\frac{1}{3}} \biggl\vert \curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,\mu ) -\frac{1}{8}\curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,1 ) \biggr\vert ^{p}\,d\mu \biggr) ^{ \frac{1}{p}}\\ &\qquad \times\biggl( \int _{0}^{\frac{1}{3}} \bigl\vert \mathfrak{F}^{\prime } \bigl( \mu \sigma _{2}+ ( 1-\mu ) \sigma _{1} \bigr) \bigr\vert ^{q}\,d\mu \biggr) ^{\frac{1}{q}} \\ & \qquad + \biggl( \int _{0}^{\frac{1}{3}} \biggl\vert \curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,\mu ) -\frac{1}{8}\curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,1 ) \biggr\vert ^{p}\,d\mu \biggr) ^{ \frac{1}{p}}\\ &\qquad \times \biggl( \int _{0}^{\frac{1}{3}} \bigl\vert \mathfrak{F}^{\prime } \bigl( \mu \sigma _{1}+ ( 1-\mu ) \sigma _{2} \bigr) \bigr\vert ^{q}\,d\mu \biggr) ^{\frac{1}{q}} \\ & \qquad + \biggl( \int _{\frac{1}{3}}^{\frac{2}{3}} \biggl\vert \curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,\mu ) -\frac{1}{2}\curlyvee _{ \lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,1 ) \biggr\vert ^{p}\,d\mu \biggr) ^{\frac{1}{p}} \\ &\qquad \times\biggl( \int _{\frac{1}{3}}^{\frac{2}{3}} \bigl\vert \mathfrak{F}^{\prime } \bigl( \mu \sigma _{2}+ ( 1- \mu ) \sigma _{1} \bigr) \bigr\vert ^{q}\,d\mu \biggr) ^{\frac{1}{q}} \\ & \qquad + \biggl( \int _{\frac{1}{3}}^{\frac{2}{3}} \biggl\vert \curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,\mu ) -\frac{1}{2}\curlyvee _{ \lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,1 ) \biggr\vert ^{p}\,d\mu \biggr) ^{\frac{1}{p}} \\ &\qquad \times\biggl( \int _{\frac{1}{3}}^{\frac{2}{3}} \bigl\vert \mathfrak{F}^{\prime } \bigl( \mu \sigma _{1}+ ( 1- \mu ) \sigma _{2} \bigr) \bigr\vert ^{q}\,d\mu \biggr) ^{\frac{1}{q}} \\ & \qquad + \biggl( \int _{\frac{2}{3}}^{1} \biggl\vert \curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,\mu ) -\frac{7}{8}\curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,1 ) \biggr\vert ^{p}\,d\mu \biggr) ^{ \frac{1}{p}} \\ &\qquad \times\biggl( \int _{\frac{2}{3}}^{1} \bigl\vert \mathfrak{F}^{\prime } \bigl( \mu \sigma _{2}+ ( 1-\mu ) \sigma _{1} \bigr) \bigr\vert ^{q}\,d\mu \biggr) ^{\frac{1}{q}} \\ & \qquad + \biggl( \int _{\frac{2}{3}}^{1} \biggl\vert \curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,\mu ) -\frac{7}{8}\curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,1 ) \biggr\vert ^{p}\,d\mu \biggr) ^{ \frac{1}{p}}\\ &\qquad \times \biggl( \int _{\frac{2}{3}}^{1} \bigl\vert \mathfrak{F}^{\prime } \bigl( \mu \sigma _{1}+ ( 1-\mu ) \sigma _{2} \bigr) \bigr\vert ^{q}\,d\mu \biggr) ^{\frac{1}{q}}\bigg\} . \end{aligned}$$
It is known that \(\vert \mathfrak{F}^{\prime } \vert ^{q}\) is convex. Then, we have
$$\begin{aligned} & \biggl\vert \frac{1}{8} \biggl[ \mathfrak{F} ( \sigma _{1} ) +3\mathfrak{F} \biggl( \frac{2\sigma _{1}+\sigma _{2}}{3} \biggr) +3 \mathfrak{F} \biggl( \frac{\sigma _{1}+2\sigma _{2}}{3} \biggr) + \mathfrak{F} ( \sigma _{2} ) \biggr] \\ & \qquad - \frac{\Gamma ( \alpha ) }{2\curlyvee _{\lambda } ( \alpha ,\sigma _{2}-\sigma _{1} ) } \bigl[ \mathcal{J}_{\sigma _{1}+}^{ ( \alpha ,\lambda ) } \mathfrak{F} ( \sigma _{2} ) +\mathcal{J}_{\sigma _{2}-}^{ ( \alpha ,\lambda ) }\mathfrak{F} ( \sigma _{1} ) \bigr] \biggr\vert \\ & \quad \leq \frac{ ( \sigma _{2}-\sigma _{1} ) ^{\alpha +1}}{2\curlyvee _{\lambda } ( \alpha ,\sigma _{2}-\sigma _{1} ) } \\ & \qquad \times \biggl\{ \biggl( \int _{0}^{\frac{1}{3}} \biggl\vert \curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,\mu ) -\frac{1}{8}\curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,1 ) \biggr\vert ^{p}\,d\mu \biggr) ^{ \frac{1}{p}} \\ &\qquad \times\biggl[ \biggl( \int _{0}^{\frac{1}{3}}\mu \bigl\vert \mathfrak{F}^{\prime } ( \sigma _{2} ) \bigr\vert ^{q}+ ( 1-\mu ) \bigl\vert \mathfrak{F}^{\prime } ( \sigma _{1} ) \bigr\vert ^{q}\,d\mu \biggr) ^{\frac{1}{q}} \\ & \qquad + \biggl( \int _{0}^{\frac{1}{3}}\mu \bigl\vert \mathfrak{F}^{\prime } ( \sigma _{1} ) \bigr\vert ^{q}+ ( 1-\mu ) \bigl\vert \mathfrak{F}^{\prime } ( \sigma _{2} ) \bigr\vert ^{q}\,d\mu \biggr) ^{\frac{1}{q}} \biggr] \\ &\qquad + \biggl( \int _{\frac{1}{3}}^{\frac{2}{3}} \biggl\vert \curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,\mu ) - \frac{1}{2}\curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,1 ) \biggr\vert ^{p}\,d\mu \biggr) ^{ \frac{1}{p}} \\ & \qquad \times \biggl[ \biggl( \int _{\frac{1}{3}}^{ \frac{2}{3}}\mu \bigl\vert \mathfrak{F}^{\prime } ( \sigma _{2} ) \bigr\vert ^{q}+ ( 1-\mu ) \bigl\vert \mathfrak{F}^{\prime } ( \sigma _{1} ) \bigr\vert ^{q}\,d \mu \biggr) ^{\frac{1}{q}}\\ &\qquad + \biggl( \int _{\frac{1}{3}}^{ \frac{2}{3}}\mu \bigl\vert \mathfrak{F}^{\prime } ( \sigma _{1} ) \bigr\vert ^{q}+ ( 1-\mu ) \bigl\vert \mathfrak{F}^{\prime } ( \sigma _{2} ) \bigr\vert ^{q}\,d \mu \biggr) ^{\frac{1}{q}} \biggr] \\ & \qquad + \biggl( \int _{\frac{2}{3}}^{1} \biggl\vert \curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,\mu ) -\frac{7}{8}\curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,1 ) \biggr\vert ^{p}\,d\mu \biggr) ^{ \frac{1}{p}}\\ &\qquad \times \biggl[ \biggl( \int _{\frac{2}{3}}^{1}\mu \bigl\vert \mathfrak{F}^{\prime } ( \sigma _{2} ) \bigr\vert ^{q}+ ( 1-\mu ) \bigl\vert \mathfrak{F}^{\prime } ( \sigma _{1} ) \bigr\vert ^{q}\,d\mu \biggr) ^{\frac{1}{q}} \\ & \qquad + \biggl( \int _{\frac{2}{3}}^{1}\mu \bigl\vert \mathfrak{F}^{\prime } ( \sigma _{1} ) \bigr\vert ^{q}+ ( 1-\mu ) \bigl\vert \mathfrak{F}^{\prime } ( \sigma _{2} ) \bigr\vert ^{q}\,d\mu \biggr) ^{ \frac{1}{q}} \biggr] \biggr\} \\ & \quad = \frac{ ( \sigma _{2}-\sigma _{1} ) ^{\alpha +1}}{2\curlyvee _{\lambda } ( \alpha ,\sigma _{2}-\sigma _{1} ) } \biggl\{ \biggl[ \biggl( \int _{0}^{\frac{1}{3}} \biggl\vert \curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,\mu ) -\frac{1}{8}\curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,1 ) \biggr\vert ^{p}\,d\mu \biggr) ^{\frac{1}{p}} \\ & \qquad + \biggl( \int _{\frac{2}{3}}^{1} \biggl\vert \curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,\mu ) -\frac{7}{8}\curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,1 ) \biggr\vert ^{p}\,d\mu \biggr) ^{ \frac{1}{p}} \biggr] \\ & \qquad \times \biggl[ \biggl( \frac{5 \vert \mathfrak{F}^{\prime } ( \sigma _{1} ) \vert ^{q}+ \vert \mathfrak{F}^{\prime } ( \sigma _{2} ) \vert ^{q}}{18} \biggr) ^{\frac{1}{q}}+ \biggl( \frac{ \vert \mathfrak{F}^{\prime } ( \sigma _{1} ) \vert ^{q}+5 \vert \mathfrak{F}^{\prime } ( \sigma _{2} ) \vert ^{q}}{18} \biggr) ^{\frac{1}{q}} \biggr] \\ & \qquad + \biggl( \int _{\frac{1}{3}}^{\frac{2}{3}} \biggl\vert \curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,\mu ) -\frac{1}{2}\curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,1 ) \biggr\vert ^{p}\,d\mu \biggr) ^{ \frac{1}{p}} \\ & \qquad \times \biggl[ \biggl( \frac{ \vert \mathfrak{F}^{\prime } ( \sigma _{1} ) \vert ^{q}+ \vert \mathfrak{F}^{\prime } ( \sigma _{2} ) \vert ^{q}}{6} \biggr) ^{ \frac{1}{q}}+ \biggl( \frac{ \vert \mathfrak{F}^{\prime } ( \sigma _{1} ) \vert ^{q}+ \vert \mathfrak{F}^{\prime } ( \sigma _{2} ) \vert ^{q}}{6} \biggr) ^{\frac{1}{q}} \biggr] \biggr\} . \end{aligned}$$
This ends the proof of Theorem 4. □
Theorem 5
Assume that the assumptions of Lemma 1are valid. Assume also that the function \(\vert \mathfrak{F}^{\prime } \vert ^{q}\), \(q\geq 1\) is convex on \([\sigma _{1},\sigma _{2}]\). Then, the following Newton’s rule inequality holds:
$$\begin{aligned} & \biggl\vert \frac{1}{8} \biggl[ \mathfrak{F} ( \sigma _{1} ) +3\mathfrak{F} \biggl( \frac{2\sigma _{1}+\sigma _{2}}{3} \biggr) +3 \mathfrak{F} \biggl( \frac{\sigma _{1}+2\sigma _{2}}{3} \biggr) + \mathfrak{F} ( \sigma _{2} ) \biggr] \\ & \qquad - \frac{\Gamma ( \alpha ) }{2\curlyvee _{\lambda } ( \alpha ,\sigma _{2}-\sigma _{1} ) } \bigl[ \mathcal{J}_{\sigma _{1}+}^{ ( \alpha ,\lambda ) } \mathfrak{F} ( \sigma _{2} ) +\mathcal{J}_{\sigma _{2}-}^{ ( \alpha ,\lambda ) }\mathfrak{F} ( \sigma _{1} ) \bigr] \biggr\vert \\ & \quad \leq \frac{ ( \sigma _{2}-\sigma _{1} ) ^{\alpha +1}}{2\curlyvee _{\lambda } ( \alpha ,\sigma _{2}-\sigma _{1} ) } \bigl\{ \bigl( \Omega _{1} ( \alpha , \lambda ) \bigr) ^{1- \frac{1}{q}} \bigl[ \bigl( \Omega _{4} ( \alpha ,\lambda ) \bigl\vert \mathfrak{F}^{\prime } ( \sigma _{2} ) \bigr\vert ^{q}\\ &\qquad + \bigl( \Omega _{1} ( \alpha ,\lambda ) -\Omega _{4} ( \alpha ,\lambda ) \bigr) \bigl\vert \mathfrak{F}^{\prime } ( \sigma _{1} ) \bigr\vert ^{q} \bigr) ^{\frac{1}{q}} \\ & \qquad + \bigl( \Omega _{4} ( \alpha ,\lambda ) \bigl\vert \mathfrak{F}^{\prime } ( \sigma _{1} ) \bigr\vert ^{q}+ \bigl( \Omega _{1} ( \alpha ,\lambda ) - \Omega _{4} ( \alpha ,\lambda ) \bigr) \bigl\vert \mathfrak{F}^{\prime } ( \sigma _{2} ) \bigr\vert ^{q} \bigr) ^{\frac{1}{q}} \bigr] \\ & \qquad + \bigl( \Omega _{2} ( \alpha ,\lambda ) \bigr) ^{1- \frac{1}{q}} \bigl[ \bigl( \Omega _{5} ( \alpha ,\lambda ) \bigl\vert \mathfrak{F}^{\prime } ( \sigma _{2} ) \bigr\vert ^{q}+ \bigl( \Omega _{2} ( \alpha ,\lambda ) - \Omega _{5} ( \alpha ,\lambda ) \bigr) \bigl\vert \mathfrak{F}^{\prime } ( \sigma _{1} ) \bigr\vert ^{q} \bigr) ^{\frac{1}{q}} \\ & \qquad + \bigl( \Omega _{5} ( \alpha ,\lambda ) \bigl\vert \mathfrak{F}^{\prime } ( \sigma _{1} ) \bigr\vert ^{q}+ \bigl( \Omega _{2} ( \alpha ,\lambda ) - \Omega _{5} ( \alpha ,\lambda ) \bigr) \bigl\vert \mathfrak{F}^{\prime } ( \sigma _{2} ) \bigr\vert ^{q} \bigr) ^{\frac{1}{q}} \bigr] \\ & \qquad + \bigl( \Omega _{3} ( \alpha ,\lambda ) \bigr) ^{1- \frac{1}{q}} \bigl[ \bigl( \Omega _{6} ( \alpha ,\lambda ) \bigl\vert \mathfrak{F}^{\prime } ( \sigma _{2} ) \bigr\vert ^{q}+ \bigl( \Omega _{3} ( \alpha ,\lambda ) - \Omega _{6} ( \alpha ,\lambda ) \bigr) \bigl\vert \mathfrak{F}^{\prime } ( \sigma _{1} ) \bigr\vert ^{q} \bigr) ^{\frac{1}{q}} \\ & \qquad + \bigl( \Omega _{6} ( \alpha ,\lambda ) \bigl\vert \mathfrak{F}^{\prime } ( \sigma _{1} ) \bigr\vert ^{q}+ \bigl( \Omega _{3} ( \alpha ,\lambda ) - \Omega _{6} ( \alpha ,\lambda ) \bigr) \bigl\vert \mathfrak{F}^{\prime } ( \sigma _{2} ) \bigr\vert ^{q} \bigr) ^{\frac{1}{q}} \bigr] \bigr\} . \end{aligned}$$
Here, \(\Omega _{1} ( \alpha ,\lambda ) \), \(\Omega _{2} ( \alpha ,\lambda ) \) and \(\Omega _{3} ( \alpha ,\lambda ) \) are described in (14) and
$$ \textstyle\begin{cases} \Omega _{4} ( \alpha ,\lambda ) =\int _{0}^{ \frac{1}{3}}\mu \vert \curlyvee _{\lambda ( \sigma _{2}- \sigma _{1} ) } ( \alpha ,\mu ) -\frac{1}{8} \curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,1 ) \vert \,d\mu , \\ \Omega _{5} ( \alpha ,\lambda ) =\int _{ \frac{1}{3}}^{\frac{2}{3}}\mu \vert \curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,\mu ) -\frac{1}{2}\curlyvee _{ \lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,1 ) \vert \,d\mu , \\ \Omega _{6} ( \alpha ,\lambda ) =\int _{ \frac{2}{3}}^{1}\mu \vert \curlyvee _{\lambda ( \sigma _{2}- \sigma _{1} ) } ( \alpha ,\mu ) -\frac{7}{8} \curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,1 ) \vert \,d\mu .\end{cases} $$
Proof
Let us start with applying power-mean inequality in inequality (15). Then, we have
$$\begin{aligned} & \bigg\vert \frac{1}{8} \biggl[ \mathfrak{F} ( \sigma _{1} ) +3\mathfrak{F} \biggl( \frac{2\sigma _{1}+\sigma _{2}}{3} \biggr) +3 \mathfrak{F} \biggl( \frac{\sigma _{1}+2\sigma _{2}}{3} \biggr) + \mathfrak{F} ( \sigma _{2} ) \biggr] \\ &\quad - \frac{\Gamma ( \alpha ) }{2\curlyvee _{\lambda } ( \alpha ,\sigma _{2}-\sigma _{1} ) } \bigl[ \mathcal{J}_{\sigma _{1}+}^{ ( \alpha ,\lambda ) } \mathfrak{F} ( \sigma _{2} ) +\mathcal{J}_{\sigma _{2}-}^{ ( \alpha ,\lambda ) }\mathfrak{F} ( \sigma _{1} ) \bigr] \bigg\vert \\ & \leq \frac{ ( \sigma _{2}-\sigma _{1} ) ^{\alpha +1}}{2\curlyvee _{\lambda } ( \alpha ,\sigma _{2}-\sigma _{1} ) } \bigg\{ \biggl( \int _{0}^{\frac{1}{3}} \biggl\vert \curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,\mu ) -\frac{1}{8}\curlyvee _{\lambda ( \sigma _{2}- \sigma _{1} ) } ( \alpha ,1 ) \biggr\vert \,d\mu \biggr) ^{1-\frac{1}{q}} \\ & \quad \times \biggl( \int _{0}^{\frac{1}{3}} \biggl\vert \curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,\mu ) -\frac{1}{8}\curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,1 ) \biggr\vert \bigl\vert \mathfrak{F}^{ \prime } \bigl( \mu \sigma _{2}+ ( 1-\mu ) \sigma _{1} \bigr) \bigr\vert ^{q}\,d\mu \biggr) ^{\frac{1}{q}} \\ & \quad + \biggl( \int _{0}^{\frac{1}{3}} \biggl\vert \curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,\mu ) -\frac{1}{8}\curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,1 ) \biggr\vert \,d\mu \biggr) ^{1-\frac{1}{q}} \\ & \quad \times \biggl( \int _{0}^{\frac{1}{3}} \biggl\vert \curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,\mu ) -\frac{1}{8}\curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,1 ) \biggr\vert \bigl\vert \mathfrak{F}^{ \prime } \bigl( \mu \sigma _{1}+ ( 1-\mu ) \sigma _{2} \bigr) \bigr\vert ^{q}\,d\mu \biggr) ^{\frac{1}{q}} \\ & \quad + \biggl( \int _{\frac{1}{3}}^{\frac{2}{3}} \biggl\vert \curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,\mu ) -\frac{1}{2}\curlyvee _{ \lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,1 ) \biggr\vert \,d\mu \biggr) ^{1-\frac{1}{q}} \\ & \quad \times \biggl( \int _{\frac{1}{3}}^{\frac{2}{3}} \biggl\vert \curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,\mu ) -\frac{1}{2}\curlyvee _{ \lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,1 ) \biggr\vert \bigl\vert \mathfrak{F}^{\prime } \bigl( \mu \sigma _{2}+ ( 1-\mu ) \sigma _{1} \bigr) \bigr\vert ^{q}\,d\mu \biggr) ^{\frac{1}{q}} \\ & \quad + \biggl( \int _{\frac{1}{3}}^{\frac{2}{3}} \biggl\vert \curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,\mu ) -\frac{1}{2}\curlyvee _{ \lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,1 ) \biggr\vert \,d\mu \biggr) ^{1-\frac{1}{q}} \\ & \quad \times \biggl( \int _{\frac{1}{3}}^{\frac{2}{3}} \biggl\vert \curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,\mu ) -\frac{1}{2}\curlyvee _{ \lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,1 ) \biggr\vert \bigl\vert \mathfrak{F}^{\prime } \bigl( \mu \sigma _{1}+ ( 1-\mu ) \sigma _{2} \bigr) \bigr\vert ^{q}\,d\mu \biggr) ^{\frac{1}{q}} \\ & \quad + \biggl( \int _{\frac{2}{3}}^{1} \biggl\vert \curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,\mu ) -\frac{7}{8}\curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,1 ) \biggr\vert \,d\mu \biggr) ^{1-\frac{1}{q}} \\ & \quad \times \biggl( \int _{\frac{2}{3}}^{1} \biggl\vert \curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,\mu ) -\frac{7}{8}\curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,1 ) \biggr\vert \bigl\vert \mathfrak{F}^{ \prime } \bigl( \mu \sigma _{2}+ ( 1-\mu ) \sigma _{1} \bigr) \bigr\vert ^{q}\,d\mu \biggr) ^{\frac{1}{q}} \\ & \quad + \biggl( \int _{\frac{2}{3}}^{1} \biggl\vert \curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,\mu ) -\frac{7}{8}\curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,1 ) \biggr\vert \,d\mu \biggr) ^{1-\frac{1}{q}} \\ & \quad \times \biggl( \int _{\frac{2}{3}}^{1} \biggl\vert \curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,\mu ) -\frac{7}{8}\curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,1 ) \biggr\vert \bigl\vert \mathfrak{F}^{\prime } \bigl( \mu \sigma _{1}+ ( 1-\mu ) \sigma _{2} \bigr) \bigr\vert ^{q}\,d\mu \biggr) ^{\frac{1}{q}}\bigg\} . \end{aligned}$$
From the fact of convexity of \(\vert \mathfrak{F}^{\prime } \vert ^{q}\), we can readily obtain
$$\begin{aligned} & \biggl\vert \frac{1}{8} \biggl[ \mathfrak{F} ( \sigma _{1} ) +3\mathfrak{F} \biggl( \frac{2\sigma _{1}+\sigma _{2}}{3} \biggr) +3 \mathfrak{F} \biggl( \frac{\sigma _{1}+2\sigma _{2}}{3} \biggr) + \mathfrak{F} ( \sigma _{2} ) \biggr] \\ & \qquad - \frac{\Gamma ( \alpha ) }{2\curlyvee _{\lambda } ( \alpha ,\sigma _{2}-\sigma _{1} ) } \bigl[ \mathcal{J}_{\sigma _{1}+}^{ ( \alpha ,\lambda ) } \mathfrak{F} ( \sigma _{2} ) +\mathcal{J}_{\sigma _{2}-}^{ ( \alpha ,\lambda ) }\mathfrak{F} ( \sigma _{1} ) \bigr] \biggr\vert \\ &\quad \leq \frac{ ( \sigma _{2}-\sigma _{1} ) ^{\alpha +1}}{2\curlyvee _{\lambda } ( \alpha ,\sigma _{2}-\sigma _{1} ) } \biggl\{ \biggl( \int _{0}^{\frac{1}{3}} \biggl\vert \curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,\mu ) -\frac{1}{8}\curlyvee _{\lambda ( \sigma _{2}- \sigma _{1} ) } ( \alpha ,1 ) \biggr\vert \,d\mu \biggr) ^{1-\frac{1}{q}} \\ & \qquad \times \biggl[ \biggl( \int _{0}^{\frac{1}{3}} \biggl\vert \curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,\mu ) -\frac{1}{8}\curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,1 ) \biggr\vert \\ &\qquad \times\bigl[ \mu \bigl\vert \mathfrak{F}^{\prime } ( \sigma _{2} ) \bigr\vert ^{q}+ ( 1-\mu ) \bigl\vert \mathfrak{F}^{\prime } ( \sigma _{1} ) \bigr\vert ^{q} \bigr] \,d\mu \biggr) ^{\frac{1}{q}} \\ & \qquad + \biggl( \int _{0}^{\frac{1}{3}} \biggl\vert \curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,\mu ) -\frac{1}{8}\curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,1 ) \biggr\vert \\ &\qquad \times\bigl[ \mu \bigl\vert \mathfrak{F}^{\prime } ( \sigma _{1} ) \bigr\vert ^{q}+ ( 1-\mu ) \bigl\vert \mathfrak{F}^{\prime } ( \sigma _{2} ) \bigr\vert ^{q} \bigr] \,d\mu \biggr) ^{\frac{1}{q}} \biggr] \\ & \qquad + \biggl( \int _{\frac{1}{3}}^{\frac{2}{3}} \biggl\vert \curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,\mu ) -\frac{1}{2}\curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,1 ) \biggr\vert \,d\mu \biggr) ^{1-\frac{1}{q}} \\ & \qquad \times \biggl[ \biggl( \int _{\frac{1}{3}}^{ \frac{2}{3}} \biggl\vert \curlyvee _{\lambda ( \sigma _{2}- \sigma _{1} ) } ( \alpha ,\mu ) -\frac{1}{2} \curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,1 ) \biggr\vert \\ &\qquad \times\bigl[ \mu \bigl\vert \mathfrak{F}^{ \prime } ( \sigma _{2} ) \bigr\vert ^{q}+ ( 1-\mu ) \bigl\vert \mathfrak{F}^{\prime } ( \sigma _{1} ) \bigr\vert ^{q} \bigr] \,d\mu \biggr) ^{\frac{1}{q}} \\ & \qquad + \biggl( \int _{\frac{1}{3}}^{\frac{2}{3}} \biggl\vert \curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,\mu ) -\frac{1}{2}\curlyvee _{ \lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,1 ) \biggr\vert \\ &\qquad \times \bigl[ \mu \bigl\vert \mathfrak{F}^{\prime } ( \sigma _{1} ) \bigr\vert ^{q}+ ( 1-\mu ) \bigl\vert \mathfrak{F}^{\prime } ( \sigma _{2} ) \bigr\vert ^{q} \bigr] \,d\mu \biggr) ^{\frac{1}{q}} \biggr] \\ & \qquad + \biggl( \int _{\frac{2}{3}}^{1} \biggl\vert \curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,\mu ) -\frac{7}{8}\curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,1 ) \biggr\vert \,d\mu \biggr) ^{1-\frac{1}{q}} \\ & \qquad \times \biggl[ \biggl( \int _{\frac{2}{3}}^{1} \biggl\vert \curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,\mu ) -\frac{7}{8}\curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,1 ) \biggr\vert \\ &\qquad \times \bigl[ \mu \bigl\vert \mathfrak{F}^{\prime } ( \sigma _{2} ) \bigr\vert ^{q}+ ( 1-\mu ) \bigl\vert \mathfrak{F}^{\prime } ( \sigma _{1} ) \bigr\vert ^{q} \bigr] \,d\mu \biggr) ^{\frac{1}{q}} \\ & \qquad + \biggl( \int _{\frac{2}{3}}^{1} \biggl\vert \curlyvee _{\lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,\mu ) -\frac{7}{8}\curlyvee _{ \lambda ( \sigma _{2}-\sigma _{1} ) } ( \alpha ,1 ) \biggr\vert \\ &\qquad \times\bigl[ \mu \bigl\vert \mathfrak{F}^{\prime } ( \sigma _{1} ) \bigr\vert ^{q}+ ( 1-\mu ) \bigl\vert \mathfrak{F}^{\prime } ( \sigma _{2} ) \bigr\vert ^{q} \bigr] \,d\mu \biggr) ^{\frac{1}{q}} \biggr] \biggr\} . \\ & \quad = \frac{ ( \sigma _{2}-\sigma _{1} ) ^{\alpha +1}}{2\curlyvee _{\lambda } ( \alpha ,\sigma _{2}-\sigma _{1} ) } \bigl\{ \bigl( \Omega _{1} ( \alpha , \lambda ) \bigr) ^{1- \frac{1}{q}} \bigl[ \bigl( \Omega _{4} ( \alpha ,\lambda ) \bigl\vert \mathfrak{F}^{\prime } ( \sigma _{2} ) \bigr\vert ^{q}\\ &\qquad + \bigl( \Omega _{1} ( \alpha ,\lambda ) -\Omega _{4} ( \alpha ,\lambda ) \bigr) \bigl\vert \mathfrak{F}^{\prime } ( \sigma _{1} ) \bigr\vert ^{q} \bigr) ^{\frac{1}{q}} \\ & \qquad + \bigl( \Omega _{4} ( \alpha ,\lambda ) \bigl\vert \mathfrak{F}^{\prime } ( \sigma _{1} ) \bigr\vert ^{q}+ \bigl( \Omega _{1} ( \alpha ,\lambda ) - \Omega _{4} ( \alpha ,\lambda ) \bigr) \bigl\vert \mathfrak{F}^{\prime } ( \sigma _{2} ) \bigr\vert ^{q} \bigr) ^{\frac{1}{q}} \bigr] \\ & \qquad + \bigl( \Omega _{2} ( \alpha ,\lambda ) \bigr) ^{1- \frac{1}{q}} \bigl[ \bigl( \Omega _{5} ( \alpha ,\lambda ) \bigl\vert \mathfrak{F}^{\prime } ( \sigma _{2} ) \bigr\vert ^{q}+ \bigl( \Omega _{2} ( \alpha ,\lambda ) - \Omega _{5} ( \alpha ,\lambda ) \bigr) \bigl\vert \mathfrak{F}^{\prime } ( \sigma _{1} ) \bigr\vert ^{q} \bigr) ^{\frac{1}{q}} \\ & \qquad + \bigl( \Omega _{5} ( \alpha ,\lambda ) \bigl\vert \mathfrak{F}^{\prime } ( \sigma _{1} ) \bigr\vert ^{q}+ \bigl( \Omega _{2} ( \alpha ,\lambda ) - \Omega _{5} ( \alpha ,\lambda ) \bigr) \bigl\vert \mathfrak{F}^{\prime } ( \sigma _{2} ) \bigr\vert ^{q} \bigr) ^{\frac{1}{q}} \bigr] \\ & \qquad + \bigl( \Omega _{3} ( \alpha ,\lambda ) \bigr) ^{1- \frac{1}{q}} \bigl[ \bigl( \Omega _{6} ( \alpha ,\lambda ) \bigl\vert \mathfrak{F}^{\prime } ( \sigma _{2} ) \bigr\vert ^{q}+ \bigl( \Omega _{3} ( \alpha ,\lambda ) - \Omega _{6} ( \alpha ,\lambda ) \bigr) \bigl\vert \mathfrak{F}^{\prime } ( \sigma _{1} ) \bigr\vert ^{q} \bigr) ^{\frac{1}{q}} \\ & \qquad + \bigl( \Omega _{6} ( \alpha ,\lambda ) \bigl\vert \mathfrak{F}^{\prime } ( \sigma _{1} ) \bigr\vert ^{q}+ \bigl( \Omega _{3} ( \alpha ,\lambda ) - \Omega _{6} ( \alpha ,\lambda ) \bigr) \bigl\vert \mathfrak{F}^{\prime } ( \sigma _{2} ) \bigr\vert ^{q} \bigr) ^{\frac{1}{q}} \bigr] \bigr\} . \end{aligned}$$
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