#
nLab

covering of alternating group

### Context

#### Group Theory

**group theory**

### Classical groups

### Finite groups

### Group schemes

### Topological groups

### Lie groups

### Super-Lie groups

### Higher groups

### Cohomology and Extensions

# Contents

## Idea

The universal group extension of alternating groups $A_n$.

## Properties

These are double covers except for the alternating groups of degree $n = 6$ and 7 where the covers are 6-fold.

## Examples

## Reference