Singular Manual: map related functions (plural)

| #### 7.2.2.4 map related functions (plural) `fetch (plural)` the identity map between rings and qrings (see fetch (plural)) `imap (plural)` a convenient map procedure for inclusions and projections of rings (see imap (plural)) `preimage (plural)` preimage under a ring map (see preimage (plural)) `subst` substitute a ring variable (see subst (plural)) See also ncpreim_lib for the advanced preimage algorithm.

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