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A stylised h or よ, embedding a category into its functor category.
Also known as: Yoneda embedding, Yoneda functor, Representable functor notation
The Yoneda embedding sends each object to the collection of all maps into it, and the Yoneda lemma says nothing is lost: an object is determined by how everything else maps to it. Some texts write it with the hiragana よ, a rare case of a Japanese character used as a mathematical symbol.
Denotes the Yoneda embedding: the full and faithful functor sending an object to its representable presheaf.
Contexts: Mathematics
Is written h, y or the hiragana よ depending on the text, the last chosen for Nobuo Yoneda's name.
Contexts: Mathematics
A lowercase letter h or y, or the hiragana character よ formed from a curved stroke crossing a vertical one.