#18972: twographs and Seidel switching
-------------------------------------+-------------------------------------
Reporter: dimpase | Owner:
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-6.9
Component: graph theory | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/dimpase/seidelsw | 0a2dae4d4836e37f00bcc2af10dbb1b1d0313c88
Dependencies: #18960, #18948, | Stopgaps:
#18988, #18991 |
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Comment (by ncohen):
> This not a feature I would like to rely on.
I would say the same about testing equality with `True`:
{{{
sage: 1 == True
True
sage: 2 == True
True
}}}
Regardless of that, and whether you like it or not removing `True ==` does
the job, and works as intended. It is also in the documentation of the
'Unknown' truth value, and is tested in so many places that it can be
trusted to work.
> for some of them an explicit construction is referred to, and then it's
just a question of
> work. How many of these are so that "2-graph" is the only clue?
A lot. Run the `_check_db` function and you will see how many exactly. For
some of them it is not the only thing on the line but it is still the only
entry with no '?' flag.
Nathann
--
Ticket URL: <http://trac.sagemath.org/ticket/18972#comment:48>
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