#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: | bca35ddbb8d6518535b43e32ec34514fcd0ab8c8
u/gjorgenson/ticket/19512 | Stopgaps:
Dependencies: |
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Comment (by bhutz):
another puzzling example:
{{{
P.<x,y,z,w,u,v>=ProductProjectiveSpaces(QQ,[1,1,1])
H=End(P)
f=H([u,v,z^2,w^2,u^2,v^2])
}}}
Is this a morphism? It would fail the Segre embedding version (check if
the Segre embedding was a morphism) and the dimension of the ideal is 2,
but the indeterminacy locus is empty.
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Ticket URL: <http://trac.sagemath.org/ticket/19512#comment:7>
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