#
Homotopy Type Theory
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## Definition

For functors $F,G: A \to B$, a **natural transformation** $\gamma : F \to G$ consists of

- For each $a : A$, a morphism $\gamma_a: hom_B(F a,G a)$ called the
**components** of $\gamma$ at $a$.
- For each $a,b:A$ and $f:hom_A(a,b)$, we have $G f \circ \gamma_a= \gamma_b \circ F f$ (the naturality axiom).

## Properties

It follows that the type of natural transformations from $F$ to $G$ is a set.

## See also

Category theory~~ in~~~~ HoTT~~ functor precategory functor

## References

HoTT Book

Revision on September 4, 2018 at 15:29:40 by
Ali Caglayan.
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