#20489: A and B bases for Iwahori-Hecke algebras
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Reporter: andrew.mathas | Owner:
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-7.2
Component: combinatorics | Resolution:
Keywords: Iwahori-Hecke | Merged in:
algebra | Reviewers:
Authors: Andrew Mathas | Work issues:
Report Upstream: N/A | Commit:
Branch: | 74ba6e2f2c7cf9cf1a63f654ba8fd108407416f9
u/andrew.mathas/TwoIwahoriHeckeBases| Stopgaps:
Dependencies: |
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Comment (by andrew.mathas):
Replying to [comment:8 tscrim]:
>
> IMO a better test would be
> {{{#!python
> R = self.base_ring()
> try:
> R.one() / R(2)
> except ZeroDivisionError:
> raise ValueError("2 must be invertible")
> }}}
Thanks Travis. I realised that this doesn't catch 2 not being invertible
in ZZ, for example, but a slight variation catches both cases:
{{{#!python
try:
R(R.one()/2)
except (TypeError, ZeroDivisionError):
raise TypeError('The A-basis is defined only when 2 is invertible ')
}}}
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Ticket URL: <http://trac.sagemath.org/ticket/20489#comment:10>
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