Span constructions provide enough lax-univalent fibrations

Let \boxed{} be a sufficient family of univalent fibrations for \boxed{}, indexed by \boxed{}. Consider the corresponding family obtained by applying the span construction.

Sufficiency conjecture. Suppose \boxed{} is a sufficient family of univalent fibrations for \boxed{}. Then

(SpanP(G(κ))SpanP(G(κ)))κK\left(\mathbb{Span}_{\mathfrak{P}}(\mathfrak{G}^{(\kappa)}_{\bullet})\to\mathbb{Span}_{\mathfrak{P}}(\mathfrak{G}^{(\kappa)})\right)_{\kappa\in K}

provides enough lax-univalent fibrations for Cat(SegP(-Grpd))\mathfrak{Cat}(\mathfrak{Seg}_{\mathfrak{P}}(\mathfrak{\infty\textnormal{-}Grpd})).

The conjecture asserts that every relevant class of discrete cocartesian fibrations in the Segal-object setting is classified by a universal fibration obtained from a sufficient family in the ambient (,1)(\infty,1)-categorical setting. It complements the preceding conjecture, which identifies the lax-univalence of each span-constructed fibration.

Sources & referencesView supporting material

Primary source

David Kern, “All Segal objects are generalised monads in spans”, arXiv:2401.04704 (2025).

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