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Suppose W is a 4-manifold with good fundamental group and M is a closed simply-connected 4-manifold. Suppose we are given two decompositions h1: W {reversed tilde equals} M#W1 and h2: W {reversed tilde equals} M#W2 inducing the same decomposition of π2W. In this paper we study when we can conclude that W1 and W2 are homeomorphic. As a consequence we conclude that the * operation for changing the Kirby-Siebenmann invariant of a 4-manifold is well defined. We will also use this discussion to relate the ambient approach to classification to the surgery approach. © 1994.

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Stong, R. (1994). Uniqueness of connected sum decompositions in dimension 4. Topology and Its Applications, 56(3), 277–291. https://doi.org/10.1016/0166-8641(94)90080-9

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