7.5 Forming Closures of Domains

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
February 2000