#16678: Fix coercions for descent and symmetric group algebras
-------------------------------------+-------------------------------------
Reporter: tscrim | Owner: tscrim
Type: defect | Status: needs_work
Priority: major | Milestone: sage-6.3
Component: coercion | Resolution:
Keywords: symmetric group | Merged in:
algebra, descent algebra | Reviewers: Darij Grinberg
Authors: Travis Scrimshaw | Work issues:
Report Upstream: N/A | Commit:
Branch: | 3fa802d270a0d6f560ecd845132c22a85add33ee
public/coercion/fix_sga_coercions-16678| Stopgaps:
Dependencies: |
-------------------------------------+-------------------------------------
Changes (by vbraun):
* status: positive_review => needs_work
Comment:
{{{
sage -t --long src/sage/categories/groups.py
**********************************************************************
File "src/sage/categories/groups.py", line 531, in
sage.categories.groups.Groups.Algebras.example
Failed example:
GroupAlgebras(QQ).example(SymmetricGroup(4))
Expected:
Group algebra of Symmetric group of order 4! as a permutation group
over Rational Field
Got:
Symmetric group algebra of order 4 over Rational Field
**********************************************************************
File "src/sage/categories/groups.py", line 578, in
sage.categories.groups.Groups.Algebras.ParentMethods.algebra_generators
Failed example:
GroupAlgebras(QQ).example(SymmetricGroup(10)).algebra_generators()
Expected:
Finite family {(1,2): B[(1,2)], (1,2,3,4,5,6,7,8,9,10):
B[(1,2,3,4,5,6,7,8,9,10)]}
Got:
[[2, 1, 3, 4, 5, 6, 7, 8, 9, 10], [2, 3, 4, 5, 6, 7, 8, 9, 10, 1]]
**********************************************************************
sage -t --long
src/sage/combinat/root_system/hecke_algebra_representation.py
**********************************************************************
File "src/sage/combinat/root_system/hecke_algebra_representation.py", line
81, in
sage.combinat.root_system.hecke_algebra_representation.HeckeAlgebraRepresentation.__init__
Failed example:
HeckeAlgebraRepresentation(domain, action, CartanType(["A",2]), 1, -1)
Expected:
A representation of the (1, -1)-Hecke algebra of type ['A', 2]
on Group algebra of Symmetric group of order 3! as a permutation group
over Rational Field
Got:
A representation of the (1, -1)-Hecke algebra of type ['A', 2] on
Symmetric group algebra of order 3 over Rational Field
**********************************************************************
File "src/sage/combinat/root_system/hecke_algebra_representation.py", line
229, in
sage.combinat.root_system.hecke_algebra_representation.HeckeAlgebraRepresentation.on_basis
Failed example:
rho.on_basis(W.one(), (1,2,1))
Expected:
B[(1,3)]
Got:
(1,3)
**********************************************************************
}}}
--
Ticket URL: <http://trac.sagemath.org/ticket/16678#comment:6>
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