#11553: Matrix morphism additions
------------------------------+---------------------------------------------
Reporter: rbeezer | Owner: jason, was
Type: enhancement | Status: needs_review
Priority: minor | Milestone: sage-4.7.2
Component: linear algebra | Keywords:
Work_issues: | Upstream: N/A
Reviewer: | Author: Rob Beezer
Merged: | Dependencies: #11552
------------------------------+---------------------------------------------
Old description:
> Adds three methods to the matrix morphism class:
>
> 1. {{{is_bijective()}}}
> 1. {{{is_identity()}}}
> 1. {{{inverse()}}}
>
> I did not notice that {{{__invert___}}} via ~ was available by using tab-
> completion, which should explain the last one.
>
> If there is a theme, it is better support for compositions of these
> morphisms.
>
> '''Depends'''
> 1. #11552
>
> '''Apply:'''
> 1. [attachment:trac_11553-matrix-morphisms-additions-v2.patch]
New description:
Adds three methods to the matrix morphism class:
1. {{{is_bijective()}}}
1. {{{is_identity()}}}
1. {{{inverse()}}}
I did not notice that {{{__invert___}}} via ~ was available by using tab-
completion, which should explain the last one.
If there is a theme, it is better support for compositions of these
morphisms.
'''Depends'''
1. #11552
'''Apply:'''
1. [attachment:trac_11553-matrix-morphisms-additions-v3.patch]
--
Comment(by rbeezer):
v3 patch makes `is_identity()` more robust, adds `is_zero()` and a test to
see if two matrix morphisms are equal ''as functions'', not just that they
have the same representation.
A few methods are relocated within the file, as well, to group things more
logically.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11553#comment:6>
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