Abstract
Given a group G and an integer n ≥ 2 , we construct a new group \tilde{\mathcal{K}}(G,n) . Although this construction naturally occurs in the context of finding new invariants for complex algebraic surfaces, it is related to the theory of central extensions and the Schur multiplier. A surprising application is that Abelian groups of odd order possess naturally defined covers that can be computed from a given cover by a kind of warped Baer sum.
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