Exotic diffeomorphisms on a contractible 4-manifold surviving two stabilizations
Abstract
We develop a Pin(2) × Z2-equivariant refinement of the lattice homotopy type for computing equivariant Seiberg--Witten Floer homotopy types. As an application, we construct a relatively exotic diffeomorphism on a compact contractible 4-manifold that survives two stabilizations.
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