#18399: projective automorphism group fails for homogenized maps
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Reporter: bhutz | Owner: bhutz
Type: defect | Status: needs_review
Priority: minor | Milestone: sage-6.7
Component: algebraic | Resolution:
geometry | Merged in:
Keywords: projective | Reviewers:
morphism | Work issues:
Authors: Ben Hutz | Commit:
Report Upstream: N/A | 6c04c13be814efb25bae9ebaa71b0d9daecca608
Branch: | Stopgaps:
u/bhutz/ticket/18399 |
Dependencies: |
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Changes (by bhutz):
* status: new => needs_review
* commit: => 6c04c13be814efb25bae9ebaa71b0d9daecca608
Old description:
> When the numerator is a constant, the conversion to .polynomial()
> conversion is return a different variable than the denominator. This is
> the expected behavior from the documentation of those functions. So this
> ticket will change how the conversion is done.
>
> Example that fails
>
> {{{
> A.<z>=AffineSpace(QQ,1)
> HA=End(A)
> f=HA([1/z^7])
> F=f.homogenize(1)
> F.automorphism_group()
>
> }}}
New description:
When the numerator is a constant, the .polynomial() conversion returns a
different variable than the denominator. This is the expected behavior
from the documentation of those functions. So this ticket will change how
the conversion is done.
Example that fails
{{{
A.<z>=AffineSpace(QQ,1)
HA=End(A)
f=HA([1/z^7])
F=f.homogenize(1)
F.automorphism_group()
}}}
--
Comment:
New commits:
||[http://git.sagemath.org/sage.git/commit/?id=6c04c13be814efb25bae9ebaa71b0d9daecca608
6c04c13]||{{{18399: fix bug in projective morphism automorphism group}}}||
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Ticket URL: <http://trac.sagemath.org/ticket/18399#comment:2>
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