Besides constructing domains from generators, one can also form the
closure of a given domain with an element or another domain.
There are different notions of closure, one has to specify one
according to the desired result and the structure of the given domain.
The functions to compute closures have names such as
ClosureSomething.
For example, if D is a group and one wants to construct the group
generated by D and an element g then one can use
ClosureGroup( D, g ).
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GAP 4 manual