#13649: Implement sigma.domain() and sigma.codomain() for sigma a permutation
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Reporter: nthiery | Owner: joyner
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-5.6
Component: group theory | Resolution:
Keywords: beginner, aggregation | Work issues:
Report Upstream: N/A | Reviewers:
Authors: Andrea Lazzarotto | Merged in:
Dependencies: | Stopgaps:
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Comment (by nthiery):
Replying to [comment:8 kini]:
> Does it really make sense to have a codomain for the permutation group
itself? I can see why if you consider an individual permutation as a map,
you might want to know its codomain, but the whole permutation group isn't
a map. I can see why the group might have a "domain", since it's the
underlying set of the standard group action, but that seems to be a bit
different from the "domain of a function" usage.
As far as I recall, Sage's Homsets have a domain and a codomain (which
coincide for EndSets). The symmetric group is special case, and it would
seem consistent to have this systematically for all sets of functions.
Cheers,
Nicolas
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13649#comment:10>
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