# Segal spaces, spans, and semicategories

@article{Haugseng2019SegalSS,
title={Segal spaces, spans, and semicategories},
author={R. Haugseng},
journal={arXiv: Algebraic Topology},
year={2019}
}
• R. Haugseng
• Published 2019
• Mathematics
• arXiv: Algebraic Topology
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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