# nLab Homotopical Algebra

Contents

model category

## Model structures

for ∞-groupoids

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

#### Homotopy theory

introducing the theory of model categories as a tool in homotopy theory.

# Contents

## Chapter II. Examples of simplicial homotopy theories

### 6. Modules over a simplicial ring

category: reference

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