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What is the enriched Yoneda lemma?

The enriched Yoneda lemma generalizes the standard Yoneda lemma to enriched categories, where morphisms are elements of a monoidal category rather than just sets. It states that the object of enriched natural transformations from Hom_X to F is isomorphic, as an object of the enriching category, to F(X)F(X).

Conditions

  • The setting is enriched category theory.
  • Hom_X denotes the representable functor at X.
  • F is a functor in the same enriched context.

Reasoning, step by step

  1. Identify the enriched category context.
  2. Consider the enriched natural transformations from Hom_X to F.
  3. Conclude that this object is isomorphic to F(X)F(X) in the enriching category.

Example

The speaker states: 'the set of enriched natural transformations from Hom X to F is isomorphic as an object, e.g. a topological space, to F of X.'

Common misconceptions

  • Thinking the enriched Yoneda lemma only applies to sets.
  • Assuming the isomorphism is always a set-theoretic bijection.

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