Contents

category theory

# Contents

## Idea

For $G$ a group, there is a groupoid $(G \rightrightarrows \ast)$ with

This may be understood as the “delooping” of $G$ in the ambient (infinity,1)-topos, and is, as such, naturally denoted $\mathbf{B}G$.

## References

For more see at

Last revised on April 28, 2021 at 16:13:27. See the history of this page for a list of all contributions to it.