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Homotopy composition of cospans (1602.08739v2)
Published 28 Feb 2016 in math.CT, cs.LO, math.AT, and quant-ph
Abstract: It is well known that the category of finite sets and cospans, composed by pushout, contains the universal {\em special} commutative Frobenius algebra. In this note we observe that the same construction yields also general commutative Frobenius algebras, if just the pushouts are changed to homotopy pushouts.
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