60 Result(s)
within
Mathematics
Analysis
Geometry
Mathematics, general
**hu Li
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Article
A new algorithm for the inversion of Hankel and Toeplitz matrices
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Article
Lie algebras with nilpotent radical
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Article
Representations of Lie algebras of step matrices
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Article
Alcune probabilità geometriche di reticoli nel piano
We consider, on the euclidean planeE 2, a lattice of fundamental regions that are regular polygons, triangles or parallelograms. We determin the probabilityp in order that a vertex of the latticeR belongs to a ci...
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Article
Non-Gaussian limit distributions of solutions of the many-dimensional Bürgers equation with random initial data
Limit distributions of solutions of the multidimensional Bürgers equation are found in the case where an initial condition is a random field of type χ2 of degreek with a long-range dependence.
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Article
Two applications of noncommutative Groebner bases
Utilizzando le basi di Groebner non-commutative secondo Mora diamo, in questo lasvoro, una descrizione algoritmica delle relazioni che definiscono un’algebra quadratica con una base di tipo PBW e ciò ci permet...
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Article
Interval Oscillation Criteria for Second-Order Nonlinear Differential Equations
We present new interval oscillation criteria for certain classes of second-order nonlinear differential equations, which are different from the most known ones in the sense that they are based only on informat...
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Article
A note on ℵ-spaces and sn-metrizable spaces
In this paper we give two map** theorems on ℵ-spaces and sn-metrizable spaces by means of some sequence-covering map**s and mssc-map**s, and get characterizations of quotient (pseudo-open) mssc-images of me...
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Article
The rule of cycle length and global asymptotic stability for a third-order nonlinear difference equation
In this paper, the following third-order nonlinear difference equation $$x_{n+1}=\frac{x_{n-1}^b x_{n-2}+1}{x_{n-1}^b + x_{n-2}},\quad...
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Article
Global subsonic compressible flows through a two-dimensional periodic duct
We deal with two-dimensional compressible potential subsonic flows in an infinitely long duct with periodic walls. It is shown that there exists a critical value of mass flux: If the incoming mass flux is less...
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Article
On strongly g-developable spaces
In this paper, we prove that a space is a strongly g-developable space iff it is a sequence-covering, quotient, π, mssc-image of a metric space, which answers a question for strongly g-developable spaces.
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Article
L- and M-weak compactness of positive semi-compact operators
We present some necessary and sufficient conditions for positive semi-compact operators being L-weakly compact and M-weakly compact respectively.
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Article
On generalization of minimal non-nilpotent groups
A finite group is said to be p-closed, if its Sylow p-subgroup is normal. A minimal non-nilpotent group means that all of its proper subgroups are nilpotent but the group itself is not. O.J. Schmidt showed that t...
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Article
Some properties of solutions for an evolution p(x)-Laplacian equation
We consider an initial-boundary value problem for an evolution p(x)-Laplacian equation. The problems describe the motion of generalized Newtonian fluids which were studied by some other authors. Under some assump...
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Article
A family of derivative-free methods for nonlinear equations
In this paper, we derive a family of new derivative-free third order methods for solving nonlinear equations. In all proposed methods, each member of the family requires three evaluations of the given function...
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Article
On the dynamical behavior of some algal allelopathic competitions in chemostat-like environment
The dynamics of some algal allelopathic competitions taking place in a laboratory chemostat-like environment are analyzed. Our main results concern the global asymptotic stability of some biologically meaningf...
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On weakly s-normal subgroups of finite groups
Assume that G is a finite group and H is a subgroup of G: We say that H is s-permutably imbedded in G if, for every prime number p that divides |H|; a Sylow p-subgroup of H is also a Sylow p-subgroup of some s-pe...
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On ss-quasinormal and weakly s-supplemented subgroups of finite groups
Assume that G is a finite group and H is a subgroup of G: A subgroup H is called ss-quasinormal in G if there is a subgroup B of G such that G = HB and H permutes with every Sylow subgroup of BI H is called weakl...
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Article
Three solutions for a perturbed Navier problem
In this paper we prove the existence of at least three distinct solutions to the following perturbed Navier problem: $$\left\{\begin{a...
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Article
SΦ-supplemented subgroups of finite groups
We call H an SΦ-supplemented subgroup of a finite group G if there exists a subnormal subgroup T of G such that G = HT and H ∩ T ≤ Φ(H), where Φ(H) is the Frattini subgroup of H. In this paper, we characterize th...
