#9326: Add cohomology of toric varieties
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Reporter: vbraun | Owner: AlexGhitza
Type: enhancement | Status: needs_info
Priority: major | Milestone: sage-4.5
Component: algebraic geometry | Keywords:
Author: Volker Braun | Upstream: N/A
Reviewer: Andrey Novoseltsev | Merged:
Work_issues: |
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Changes (by vbraun):
* status: needs_review => needs_info
Comment:
I fixed `QuotientRing` to use the coercion as described in the wiki, but
now everything else breaks. Something is going on with the coercion system
that I don't understand. With the `first_attempt.patch`, the quotient
rings work fine. But, for example, this now fails:
{{{
sage: FF = FiniteField(7)
sage: P.<x> = PolynomialRing(FF)
sage: x+1
TypeError Traceback (most recent call
last)
/home/vbraun/opt/sage-4.5.alpha1/devel/sage-main/<ipython console> in
<module>()
/home/vbraun/Sage/sage/local/lib/python2.6/site-
packages/sage/structure/element.so in
sage.structure.element.RingElement.__add__
(sage/structure/element.c:10876)()
/home/vbraun/Sage/sage/local/lib/python2.6/site-
packages/sage/structure/coerce.so in
sage.structure.coerce.CoercionModel_cache_maps.bin_op
(sage/structure/coerce.c:6966)()
TypeError: unsupported operand parent(s) for '+': 'Univariate Polynomial
Ring in x over Finite Field of size 7' and 'Integer Ring'
}}}
But I neither touched univariate polynomial rings nor finite field code!
Does anyone understand what is going on?
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/9326#comment:9>
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