Monoidal category action

In algebra, an action of a monoidal category S on a category X is a functor

\cdot: S \times X \to X

such that there are natural isomorphisms $s \cdot (t \cdot x) \simeq (s \cdot t)\cdot x$ and $e \cdot x \simeq x$ and those natural isomorphism satisfy the coherence conditions analogous to those in S.^[1] If there is such an action, S is said to act on X.

For example, S acts on itself via the monoid operation ⊗.

References

↑ Weibel, Ch. IV, Definition 4.7.

C. Weibel "The K-book: An introduction to algebraic K-theory"

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