##
Khandhawit Tirasan

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3/21(月)(14:00-15:00)

__タイトル__

**Stable homotopy invariants for 4-manifolds**

__アブストラクト__

The Bauer-Furuta invariant can be considered as a stable homotopy
refinement of the Seiberg-Witten invariant for a closed 4-manifold.
Manolescu extended
the idea to define a relative invariant for a 4-manifold with boundary.
For an example, we can explicitly compute the Bauer-Furuta invariants for
4-manifolds (with
or without boundary) possessing a metric of positive scalar curvature. The
main
technique is to deform the Seiberg-Witten map into its linearization.