Abstract
We prove a connected sum formula for involutive Heegaard Floer homology, and use it to study the involutive correction terms of connected sums. In particular, we give an example of a three-manifold with \(\underline{d}(Y) \ne d(Y) \ne \bar{d}(Y)\). We also construct a homomorphism from the three-dimensional homology cobordism group to an algebraically defined Abelian group, consisting of certain complexes (equipped with a homotopy involution) modulo a notion of local equivalence.
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KH was partially supported by NSF Grant DMS-1506358. CM and IZ were partially supported by NSF Grant DMS-1402914.
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Hendricks, K., Manolescu, C. & Zemke, I. A connected sum formula for involutive Heegaard Floer homology. Sel. Math. New Ser. 24, 1183–1245 (2018). https://doi.org/10.1007/s00029-017-0332-8
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DOI: https://doi.org/10.1007/s00029-017-0332-8