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Tutorial-11: ring homomorphisms
Tutorial-11 for CoCoA-5
CoCoA-5 lets you create ring homomorphisms; these are useful for
various purposes such as "moving" a value from one ring to another.
A homomorphism from a polynomial ring must state what the images
of the indeterminates are; and, if the homomorphism is not an
algebra homomorphism, how the coefficient ring is mapped.