On ring-valued invariants of topological pairs

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Based on the notion of a $Δ$-group(oid), ring-valued invariants of pairs of topological spaces can be defined in intrinsic topological terms.
5 pages, no figures, Theorem 1 has been removed, some corrections added

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Algebraic Topology, Group Theory, 55P99

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http://salesiana.dossiersoluciones.com/handle/123456789/122306

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/math/0701543
 http://arxiv.org/abs/math/0701543

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arXiv