RegularElementsOfSemigroup

Issue #102 resolved
Attila Egri-Nagy
created an issue

Getting the regular elements of a semigroup S can be done by finding the regular D classes and list their elements:

Concatenation(List(Filtered(GreensDClasses(S), IsRegularDClass),AsList));

However, it would be convenient to have a function for getting the regular elements directly.

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