#16725: Implement a general monoid_generators for groups
-------------------------------------+-------------------------------------
Reporter: tscrim | Owner: tscrim
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-6.3
Component: group theory | Resolution:
Keywords: | Merged in:
Authors: Travis Scrimshaw | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
public/groups/monoid_generators-16725|
c64a5fb9487a0d54da40acd2003b0a2930f06207
Dependencies: | Stopgaps:
-------------------------------------+-------------------------------------
Comment (by ncohen):
Yoooooo !
> Right (unless the user implements a custom `group_generators()`, which
is the current recommendation). (Side note, this exact error shouldn't
happen with #16718.)
Right right. I just don't know much about groups in Sage, and it was the
only way I knew to produce the bug `:-)`
> The other option would be to not have `group_generators` call
`monoid_generators`. I think the infinite loop is the lesser of two evils
(at least until we have the framework for semi-abstract methods like
this).
Hmmmm... And what would you think of not having `group_generators` call
`monoid_generators`, and have `group_generators` raise an exception if
`gens()` is not defined ? Something like that ?
{{{AttributeError: No generators are available for this group. Please
implement a .group_generators() method}}}
It would tell the user what he needs to do in order to make everything
work ?...
By the way I do not really understand what this `.gens()` exactly is. The
code seems to assume that `.gens()` returns group generators, but in this
case does the monoid code assume that `.gens()` returns monoid generators
too ?
`gens()` should be the one calling `group_generators`, not the other way
around `:-/`
Nathann
--
Ticket URL: <http://trac.sagemath.org/ticket/16725#comment:8>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
--
You received this message because you are subscribed to the Google Groups
"sage-trac" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To post to this group, send email to [email protected].
Visit this group at http://groups.google.com/group/sage-trac.
For more options, visit https://groups.google.com/d/optout.
