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2.10.4 Commands and Functions returning RINGHOM
CanonicalHom canonical homomorphism
ChainCanonicalHom canonical homomorphism
CoeffEmbeddingHom returns the coefficient embedding homomorphism of a polynomial ring
EmbeddingHom returns the embedding homomorphism of a fraction field
InducedHom homomorphism induced by a homomorphism
PolyAlgebraHom homomorphism of polynomial algebras
PolyRingHom homomorphism of polynomial rings
QQEmbeddingHom returns the homomorphism QQ --> R
QuotientingHom returns the projection homomorphism into a quotient ring