Description: Define a multifunction
restriction operator for extensible structures,
which can be used to turn statements about rings into statements about
subrings, modules into submodules, etc. This definition knows nothing
about individual structures and merely truncates the set while
leaving operators alone; individual kinds of structures will need to
handle this behavior, by ignoring operators' values outside the range,
defining a function using the base set and applying that, or explicitly
truncating the slot before use.
(Credit for this operator, as well as the 2023 modification for iset.mm,
goes to Mario Carneiro.)
(Contributed by Stefan O'Rear, 29-Nov-2014.) (Revised by Jim Kingdon,
7-Oct-2023.) |