The simplicial model of univalent foundations (after Voevodsky)

K Kapulkin, PLF Lumsdaine - Journal of the European Mathematical …, 2021 - ems.press
We present Voevodsky's construction of a model of univalent type theory in the category of
simplicial sets. To this end, we first give a general technique for constructing categorical …

All -toposes have strict univalent universes

M Shulman - arXiv preprint arXiv:1904.07004, 2019 - arxiv.org
We prove the conjecture that any Grothendieck $(\infty, 1) $-topos can be presented by a
Quillen model category that interprets homotopy type theory with strict univalent universes …

A type theory for synthetic -categories

E Riehl, M Shulman - arXiv preprint arXiv:1705.07442, 2017 - arxiv.org
We propose foundations for a synthetic theory of $(\infty, 1) $-categories within homotopy
type theory. We axiomatize a directed interval type, then define higher simplices from it and …

Modalities in homotopy type theory

E Rijke, M Shulman, B Spitters - Logical Methods in Computer …, 2020 - lmcs.episciences.org
Univalent homotopy type theory (HoTT) may be seen as a language for the category of ∞-
groupoids. It is being developed as a new foundation for mathematics and as an internal …

Brouwer's fixed-point theorem in real-cohesive homotopy type theory

M Shulman - Mathematical Structures in Computer Science, 2018 - cambridge.org
We combine homotopy type theory with axiomatic cohesion, expressing the latter internally
with a version of 'adjoint logic'in which the discretization and codiscretization modalities are …

Univalence for inverse diagrams and homotopy canonicity

M Shulman - Mathematical Structures in Computer Science, 2015 - cambridge.org
We describe a homotopical version of the relational and gluing models of type theory, and
generalize it to inverse diagrams and oplax limits. Our method uses the Reedy homotopy …

[PDF][PDF] Axioms for modelling cubical type theory in a topos

I Orton, AM Pitts - Logical Methods in Computer Science, 2018 - lmcs.episciences.org
The homotopical approach to intensional type theory views proofs of equality as paths. We
explore what is required of an object I in a topos to give such a path-based model of type …

Natural models of homotopy type theory

S Awodey - Mathematical Structures in Computer Science, 2018 - cambridge.org
The notion of a natural model of type theory is defined in terms of that of a representable
natural transfomation of presheaves. It is shown that such models agree exactly with the …

Semantics of higher inductive types

PLF Lumsdaine, M Shulman - Mathematical Proceedings of the …, 2020 - cambridge.org
Higher inductive types are a class of type-forming rules, introduced to provide basic (and not-
so-basic) homotopy-theoretic constructions in a type-theoretic style. They have proven very …

Modal dependent type theory and dependent right adjoints

L Birkedal, R Clouston, B Mannaa… - … Structures in Computer …, 2020 - cambridge.org
In recent years, we have seen several new models of dependent type theory extended with
some form of modal necessity operator, including nominal type theory, guarded and clocked …