Salut Nicolas!
On Thu, Nov 20, 2014 at 12:19:15PM +0100, Nicolas Borie wrote:
> As I was constructing some Free Modules over the symmetric
> functions, I fall on this (sage 6.4.beta2 for my version (yes,
> that's probably old)):
>
> sage: SymmetricFunctions(QQ) in CommutativeRings()
> False
> sage: SymmetricFunctions(QQ).a_realization() in CommutativeRings()
> True
>
> I would have loved that the two lines return True. If I say no
> mistakes, the symmetric functions should be an abstract parent with
> severals realizations. The category is *probably* initialized in
> sf.py with the line:
>
> Parent.__init__(self, category = GradedHopfAlgebras(R).WithRealizations())
>
> Is this enought to change this category for the following one (with
> QQ replaced by R in the source code naturally) ?
>
> sage: GradedHopfAlgebras(QQ).Commutative().WithRealizations()
+1
While you are at it, you might as well want to go for:
HopfAlgebras(R).Graded().Connected().Commutative().WithRealizations()
> Perhaps this question is relatively empty but I didn't contribute to
> Sage for something like a year. I just reviewed 2 tickets the last 6
> month and I am still scared of using git (don't laugh please!). So I
> asked before since a such one line patch cost 10 minutes for git
> lovers but probably 2 hours with the cheat-sheet of Volker for me.
> Ok, I just heard someone saying that it will need one than one line
> since it could be nice to add the proper test in the
> documentation... Rhoo....
This sounds like a perfect ticket for a come back. The extra time
you'll spend there is a long term investment anyway.
Cheers,
Nicolas
--
Nicolas M. Thiéry "Isil" <nthi...@users.sf.net>
http://Nicolas.Thiery.name/
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