#13687: Parents for groups
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Reporter: vbraun | Owner: joyner
Type: enhancement | Status: new
Priority: major | Milestone: sage-5.5
Component: group theory | Keywords:
Work issues: | Report Upstream: N/A
Reviewers: | Authors:
Merged in: | Dependencies:
Stopgaps: |
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Groups are based on the deprecated `ParentWithGens`. This ticket is about
forward-porting them to the new coercion framework.
To limit the size of the patchbomb I'm only porting the Abelian groups.
The rest depends on `old.Group`
Various oddities needed to be cleaned up in the process:
* make parents unique and elements immutable (often requires tuples
instead of lists)
* rename `AbelianGroup_class.invariants()` ->
`AbelianGroup_class.gens_orders()` since they are not necessarily the
abelian invariants (=elementary divisors).
* rename `element.list()` -> `element.exponents()` for the exponent
vector.
* implement a `AbelianGroupWithValues` where you attach values to the
(abstract) generators. Used in the unit group of a number field, for
example.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13687>
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