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Homotopy Type Theory

homotopy (changes)

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## Idea

## Definition

Let $f,g : \prod_{(x:A)}P(x)$ be two sections of a type family $P: A \to \mathcal{U}$. A **homotopy** from $f$ to $g$ is a dependent function? of type

$(f \sim g) \equiv \prod_{x : A} (f(x) = g(x))$

## Properties

Note that a homotopy is not the same as an identification $f = g$. However this can be made so if one assumes function extensionality

## See also

## References

Last revised on October 11, 2018 at 08:58:44.
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