Opened 7 months ago
Last modified 4 months ago
#28981 new defect
Bug with dimension for subschemes of products of projective spaces
Reported by: | gjorgenson | Owned by: | |
---|---|---|---|
Priority: | minor | Milestone: | sage-9.2 |
Component: | algebraic geometry | Keywords: | |
Cc: | Merged in: | ||
Authors: | Reviewers: | ||
Report Upstream: | N/A | Work issues: | |
Branch: | Commit: | ||
Dependencies: | Stopgaps: |
Description
PP.<x,y,z,a,b,c> = ProductProjectiveSpaces(QQ, [2,2]) X = PP.subscheme([x*a, x*b, x*c, y*a, y*b, y*c, z*a, z*b]) print(X.dimension()) print(X.segre_embedding().codomain().dimension())
Here X.dimension()
returns 1, while X.segre_embedding().codomain().dimension()
returns the correct answer of 0, as this subscheme is supported on a single point.
Change History (2)
comment:1 Changed 7 months ago by
- Component changed from PLEASE CHANGE to algebraic geometry
comment:2 Changed 4 months ago by
- Milestone changed from sage-9.1 to sage-9.2
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