#### 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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