#15576: Semimonomial transformation groups code is sensitive to Permutations
global
options
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Reporter: darij | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.1
Component: group | Keywords: permutation, semimonomial
theory | transformation, groups
Merged in: | Authors:
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
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As detailed in #14885, it is not healthy for code to rely on the `__mul__`
operation on permutations, since this operation depends on the
`Permutations().global_options()['mul']` variable which can change at
runtime. It is better to use the `left_action_product` and
`right_action_product` methods introduced in #15174 (formerly known as
`_left_to_right_multiply_on_left` and `_left_to_right_multiply_on_right`).
My tests show some dependence on the `__mul__` method in
`sage/groups/semimonomial_transformations/semimonomial_transformation.pyx`
and
`sage/groups/semimonomial_transformations/semimonomial_transformation_group.py`,
although it might be that only one of these files depends on it and the
other depends on the first file. Unfortunately I don't have time to study
this in detail, as I'd first have to read up on the definitions.
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Ticket URL: <http://trac.sagemath.org/ticket/15576>
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