#19512: is_morphism for maps of products of projective spaces
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Reporter: gjorgenson | Owner:
Type: enhancement | Status: needs_work
Priority: minor | Milestone:
Component: algebraic | Resolution:
geometry | Merged in:
Keywords: | Reviewers: Ben Hutz
Authors: Grayson Jorgenson | Work issues:
Report Upstream: N/A | Commit:
Branch: | f28a7df331d742ca60cee361cd245a1fe1a50832
u/gjorgenson/ticket/19512 | Stopgaps:
Dependencies: |
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Comment (by gjorgenson):
Alright, here is a revision. While testing I found that the dimension
function doesn't seem to work unless the base rings of the product spaces
are fields:
{{{
P.<x,y,z,w,u> = ProductProjectiveSpaces([2,1],ZZ)
H = End(P)
f = H([x^2,y^2,z^2,w^2,u^2])
X = P.subscheme(list(f)[0 : 3])
X.dimension()
}}}
Is there any way around this?
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Ticket URL: <http://trac.sagemath.org/ticket/19512#comment:14>
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