2-Segal sets are shown to correspond one-to-one, up to isomorphism, with pseudomonoids in the bicategory of spans, using a graphical proof that avoids higher category theory.
Baez and James Dolan,From finite sets to Feynman diagrams, Mathematics unlimited—2001 and beyond, 2001, pp
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2-Segal sets and pseudomonoids in the bicategory of spans
2-Segal sets are shown to correspond one-to-one, up to isomorphism, with pseudomonoids in the bicategory of spans, using a graphical proof that avoids higher category theory.