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Stephan M. Wehrli

  1. On Gradings in Khovanov homology and sutured Floer homology.

    Wed, 10/20/2010 - 15:01 — SomNambul
    Authors: Stephan M. Wehrli, J. Elisenda Grigsby
    Subjects: Geometric Topology
    Abstract

    We discuss generalizations of Ozsvath-Szabo's spectral sequence relating
    Khovanov homology and Heegaard Floer homology, focusing attention on an
    explicit relationship between natural Z (resp., 1/2 Z) gradings appearing in
    the two theories. These two gradings have simple representation-theoretic
    (resp., geometric) interpretations, which we also review.

  2. A remark on the topology of (n,n) Springer varieties.

    Tue, 08/18/2009 - 11:53 — SomNambul
    Authors: Stephan M. Wehrli
    Subjects: Quantum Algebra
    Abstract

    We prove a conjecture of Khovanov which identifies the topological space
    underlying the Springer variety of complete flags in C^2n stabilized by a fixed
    nilpotent operator with two Jordan blocks of size n.

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