### 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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