Volume LXVI (2025)

Issue 1 I Issue 2 I Issue 3 I Issue 4

Issue 1

The topology of critical processes, III (Computing homotopy)
Pages 3-18
Marco Grandis

Topics in the categorical algebra of closure spaces
Pages 19-35
George Janelidze, Manuela Sobral

The weak subobject classifier axiom and modules in Sup
Pages 36-64
Ulrich Höhle

A constructive account of the Kan–Quillen model structure and of Kan’s Ex∞ functor
Pages 65-124
Simon Henry

Issue 2

On the Bénabou-Roubaud Theorem
Pages 3-18
Bruno Kahn

A result about continuous lattices over the Sierpiński locale
Pages 19-32
Christopher Townsend

Almost cofibrations
Pages 33-45
Luciano Stramaccia

The topology of critical processes, IV (The homotopy structure)
Pages 46-93
Marco Grandis

Issue 3

A (mathematical) tribute to Ronnie Brown: 1935 – 2024
Pages 3-31
Tim Porter

When a matrix condition implies the Mal’tsev property
Pages 32-64
Michael Hoefnagel, Pierre-Alain Jacqmin

Connectedness through decidable quotients
Pages 65-78
Enrique Ruiz-Hernández, Pedro Solórzano

Fibrations of double groupoids, I: algebraic properties and homotopy sequences
Pages 79-119
Antonio M. Cegarra

Issue 4

Fibrations of double groupoids II: connections to simplicial sets and topological spaces
Pages 5-25
Antonio M. Cegarra

Classification diagrams of simplicial categories
Pages 26-43
Kensuke Arakawa

All Segal objects are generalised monads in spans
Pages 44-86
David Kern

Module cotangent relatif
Pages 87-120
Michel Vaquié

Errata for “Lax Kan extensions for double categories (on weak double categories, part IV)”
Pages 121-122
Marco Grandis, Robert Paré