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Algebraic and combinatorial codimension-1 transversality

Andrew Ranicki

math.ATarXiv:math/0308111

Abstract

The Waldhausen construction of Mayer-Vietoris splittings of chain complexes over an injective generalized free product of group rings is extended to a combinatorial construction of Seifert-van Kampen splittings of CW complexes with fundamental group an injective generalized free product.

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