A note on homotopy and pseudoisotopy of diffeomorphisms of 4-manifolds
classification
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diffeomorphismsexamplesgroupmanifoldsnoteclosedexplainfree
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This note serves to record examples of diffeomorphisms of closed smooth $4$-manifolds $X$ that are homotopic but not pseudoisotopic to the identity, and to explain why there are no such examples when $X$ is orientable and its fundamental group is a free group.
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