Weiping Li

  1. On a spectral sequence for twisted cohomologies.

    Authors: Weiping Li, Xiugui Liu, He Wang
    Subjects: Algebraic Topology
    Abstract

    Let ($\Omega^{\ast}(M), d$) be the de Rham cochain complex for a smooth
    compact closed manifolds $M$ of dimension $n$. For an odd-degree closed form
    $H$, there are a twisted de Rham cochain complex $(\Omega^{\ast}(M),
    d+H_\wedge)$ and its associated twisted de Rham cohomology $H^*(M,H)$. We show
    that there exists a spectral sequence $\{E^{p, q}_r, d_r\}$ derived from the
    filtration $F_p(\Omega^{\ast}(M))=\bigoplus_{i\geq p}\Omega^i(M)$ of
    $\Omega^{\ast}(M)$, which converges to the twisted de Rham cohomology
    $H^*(M,H)$.

  2. Massey Product and Twisted Cohomology of A-infinity Algebras.

    Authors: Weiping Li, Siye Wu
    Subjects: Algebraic Topology
    Abstract

    We study the twisted cohomology groups of $A_\infty$-algebras defined by
    twisting elements and their behavior under morphisms and homotopies using the
    bar construction. We define higher Massey products on the cohomology groups of
    general $A_\infty$-algebras and establish the naturality under morphisms and
    their dependency on defining systems. We construct a spectral sequence
    converging to the twisted cohomology groups an show that the higher
    differentials are given by the $A_\infty$-algebraic Massey products.

  3. A Poincar\'e-Hopf type formula for Chern character numbers.

    Authors: Huitao Feng, Weiping Li, Weiping Zhang
    Subjects: Geometric Topology
    Abstract

    For two complex vector bundles admitting a homomorphism with isolated
    singularities between them, we establish a Poincar\'e-Hopf type formula for the
    difference of the Chern character numbers of these two vector bundles. As a
    consequence, we extend the original Poincar\'e-Hopf index formula to the case
    of complex vector fields.

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