### 4.10.4 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.

User manual for Singular version 4-0-3, 2016, generated by texi2html.