Skip to main content

4 Result(s)

within Dong-Yang Chen Remove this filter Mathematics Remove this filter

and

  1. No Access

    Article

    Quantitative Characterizations of Bounded Compact Approximation Property by Semi-Fredholm Operators

    Based on a characterization of upper semi-Fredholm operators due to A. Lebow and M. Schechter, we introduce and investigate a new quantity characterizing upper semi-Fredholm operators. This quantity and severa...

    Dong Yang Chen, Ying Bin Ruan in Acta Mathematica Sinica, English Series (2023)

  2. No Access

    Article

    The approximation properties determined by operator ideals

    We introduce the notion of the right approximation property with respect to an operator ideal A and solve the duality problem for the approximation property with respect to an operator ideal A, that is, a Banach ...

    Dong Yang Chen, Lei Li in Acta Mathematica Sinica, English Series (2017)

  3. No Access

    Article

    Perturbations of frames

    In this paper, we give some sufficient conditions under which perturbations preserve Hilbert frames and near-Riesz bases. Similar results are also extended to frame sequences, Riesz sequences and Schauder fram...

    Dong Yang Chen, Lei Li, Ben Tuo Zheng in Acta Mathematica Sinica, English Series (2014)

  4. No Access

    Article

    Three-space problems for the bounded compact approximation property

    In this paper, the notion of the bounded compact approximation property (BCAP) of a pair [Banach space and its subspace] is used to prove that if X is a closed subspace of L ∞ with the BCAP, then

    Dong Yang Chen, Ben Tuo Zheng in Acta Mathematica Sinica, English Series (2013)