Singular Manual: map related functions

| ### 4.12.4 map related functions `fetch` the identity map between rings (see fetch) `imap` a convenient map procedure for inclusions and projections of rings (see imap) `preimage` preimage under a ring map (see preimage) `subst` substitution of a ring variable (see subst) See also the libraries algebra_lib and ring_lib, which contain more functions, related to maps.

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