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# Robert Lipshitz : Planar grid diagrams and bordered Floer homology

Heegaard Floer homology, a kind of (3+1)-dimensional field theory, associates chain complexes to 3-manifolds and chain maps to 4-manifolds with boundary. These complexes and maps are defined by counting holomorphic curves, and are hard to compute. Bordered Floer homology extends Heegaard Floer theory one dimension lower, assigning algebras to surfaces and differential modules to 3-manifolds with (parameterized) boundary. After introducing the bordered Floer framework, we will illustrate its construction in a toy case where it is explicit and combinatorial: planar grid diagrams. This is joint work with Peter Ozsvath and Dylan Thurston.

**Category**: Geometry and Topology**Duration**: 19:54**Date**: April 7, 2009 at 2:25 PM**Views**: 106-
**Tags:**seminar, Geometry/topology Seminar

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