#14234: Restructuring Diagram/Partition Algebras to match category structure
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Reporter: ghseeli | Owner:
Type: enhancement | AlexGhitza
Priority: minor | Status:
Component: algebra | needs_work
Keywords: Partition algebra, diagram | Milestone:
algebra, days38, days40 | sage-5.12
Authors: Stephen Doty, Aaron Lauve, | Resolution:
George H. Seelinger | Merged in:
Report Upstream: N/A | Reviewers: Travis
Branch: | Scrimshaw
Stopgaps: | Work issues:
| Dependencies: #10630
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Comment (by tscrim):
There are two reasons why I left it as `0.5` instead of `1/2`, the first
is that `floor` is being called and it seemed somewhat troublesome to
covert it to an integer, and the second is this what the old partition
algebras used (which is why I didn't look too hard to getting around the
first problem). Also IMO you're abusing the input with your `==` example,
so it's an unfair test.
I think that `da.partition_diagrams` is okay since its more of an internal
helper function, but I'll change the output to be a list in both cases to
match the output of the other such functions.
For the `0.5 +/- 0.5`, since there is no division being performed and they
are specified floating points, their bit representations are the same and
it's a power of two, so +/- are both okay (here). If it was say `0.1`
added 10 times, then it's slightly more worrisome (but I think it's still
okay...)
In any case, I'll look more deeply into seeing if I can convert this to
using rationals, make sure the 1/2's are correct (and fix it if it's not),
and fix those typos (including my spelling of propagate `:P`).
Thanks for your comments Darij.
Best,[[BR]]
Travis
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Ticket URL: <http://trac.sagemath.org/ticket/14234#comment:21>
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