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Segal spaces, spans, and semicategories (1901.08264v2)
Published 24 Jan 2019 in math.AT and math.CT
Abstract: We show that Segal spaces, and more generally category objects in an $\infty$-category $\mathcal{C}$, can be identified with associative algebras in the double $\infty$-category of spans in $\mathcal{C}$. We use this observation to prove that "having identities" is a property of a non-unital $(\infty,n)$-category.
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