#14775: Symmetric functions: extending Kronecker product, implementing Kronecker
product, extending antipode, extending forgotten basis, implementing Witt
basis
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Reporter: darij |
Owner: sage-combinat
Type: enhancement |
Status: needs_info
Priority: major |
Milestone: sage-5.11
Component: combinatorics |
Resolution:
Keywords: symmetric function, combinat, kronecker product, days49 |
Work issues:
Report Upstream: N/A |
Reviewers:
Authors: Darij Grinberg |
Merged in:
Dependencies: |
Stopgaps:
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Comment (by nthiery):
Replying to [comment:9 darij]:
> 1) Is it a good idea to also use cache for e-to-w and w-to-e? (The
downside is that there will be more caches in memory.) Same for p-to-w (my
current implementation is cacheless, thus not as fast as it could be) and
w-to-p.
Only practice will tell, and you'll probably be the one putting this
most to practice; I'd say don't cache for now, and see later if
you need it.
And at some point in the future we would want a mechanism that would
allow the user to specify which caches he want to use for his own
preferred application.
> 2) If I implement these maps, should I register them as coersions?
> (This would normally make sense, but I fear they could significantly
> slow down coercions between standard classical bases because of the
> asinine way the current system generates coercion paths.)
Go ahead. For most classical basis, Symmetrica provides a direct
conversion, and when there is one the coercion system is not as stupid
as using his depth first search :-)
In any case, if something would need to be fixed, it's the coercion
system, not the usage of coercions as above.
Cheers,
Nicolas
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/14775#comment:12>
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