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A relative Euclidean thickening

John R. Klein

math.ATarXiv:2607.29631

Abstract

For a finite CW pair (K,L), we show how to construct a Poincaré triad (P;∂0 P,∂1 P) and a weak homotopy equivalence (K,L) (P,∂0 P). Furthermore, the Poincaré pair (P,∂ P) has a trivial Spivak normal fibration. The proof is homotopy-theoretic. We also prove a uniqueness result.

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