nLab Homotopical Algebra

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Context

Model category theory

model category, model \infty -category

Definitions

Morphisms

Universal constructions

Refinements

Producing new model structures

Presentation of (,1)(\infty,1)-categories

Model structures

for \infty-groupoids

for ∞-groupoids

for equivariant \infty-groupoids

for rational \infty-groupoids

for rational equivariant \infty-groupoids

for nn-groupoids

for \infty-groups

for \infty-algebras

general \infty-algebras

specific \infty-algebras

for stable/spectrum objects

for (,1)(\infty,1)-categories

for stable (,1)(\infty,1)-categories

for (,1)(\infty,1)-operads

for (n,r)(n,r)-categories

for (,1)(\infty,1)-sheaves / \infty-stacks

Homotopy theory

homotopy theory, (∞,1)-category theory, homotopy type theory

flavors: stable, equivariant, rational, p-adic, proper, geometric, cohesive, directed

models: topological, simplicial, localic, …

see also algebraic topology

Introductions

Definitions

Paths and cylinders

Homotopy groups

Basic facts

Theorems

This page is to record the reference:

introducing the theory of model categories as a unifying tool in homotopy theory (“abstract homotopy theory”).

Contents

Chapter I. Axiomatic homotopy theory

1. The axioms

2. The loop and suspension functors

3. Fibration and cofibration sequences

4. Equivalence of homotopy theories

5. Closed model categories

Chapter II. Examples of simplicial homotopy theories

1. Simplicial categories

2. Closed simplicial model categories

3. Topological spaces, sumplicial sets, and simplicial groups

4. sAs A as a model category

5. Homology and cohomology

6. Modules over a simplicial ring

category: reference

Last revised on July 28, 2026 at 09:25:08. See the history of this page for a list of all contributions to it.