#8876: Allows triangular morphisms to have domain and codomain with different
index sets
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Reporter: hivert | Owner: hivert
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-4.4.3
Component: categories | Keywords: Triangular Morphisms
Author: Florent Hivert | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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Changes (by hivert):
* status: new => needs_review
Old description:
> Patch in progress on sage-combinat queue.
New description:
Currently triangular morphisms required to have domain and codomain with
the
same index sets. The patch remove this limitation by having
!TriangularMorphism accept a new argument {{{inverse_on_support}}}. It is
supposed to be a function `r : J |--> I` returning the leading term `i`
from the one of `j = on_basis(i)`. This is used by: {{{preimage}}} and
{{{section}}}.
I also wrote the methods {{{co_kernel_projection}}}, {{{co_reduced}}}, and
{{{_test_triangular}}}.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/8876#comment:1>
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