- substitute -- substituting values for variables
- working with multiple rings

- basic construction, source and target of a ring map
- evaluation and composition of ring maps
- kernel and coimage of a ring map
- graphIdeal -- see graphIdeal(RingMap) -- the ideal of the graph of the regular map corresponding to a ring map
- graphRing -- see graphRing(RingMap) -- the coordinate ring of the graph of the regular map corresponding to a ring map