# Homotopy Type Theory wedge sum (Rev #2, changes)

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## Idea

The wedge sum of two types $A$ and $B$, can be defined as the pushout of the span

$A \leftarrow \mathbf{1} \rightarrow B$

where the maps pick the base points of $A$ and $B$. This pushout is denoted $A \vee B$ and has basepoint $\star_{A \vee B} \equiv \mathrm{inl}(\star_A)$

## References

Revision on September 4, 2018 at 05:14:00 by Ali Caglayan. See the history of this page for a list of all contributions to it.