#18987: Parallel computation for TilingSolver.number_of_solutions
-------------------------+-------------------------------------------------
Reporter: | Owner:
slabbe | Status: needs_work
Type: | Milestone: sage-6.9
enhancement | Resolution:
Priority: major | Merged in:
Component: | Reviewers: Vincent Delecroix
combinatorics | Work issues:
Keywords: | Commit:
Authors: | 91de8636683e1c8cec7d9d33e645721572de3b1c
Sébastien Labbé | Stopgaps:
Report Upstream: N/A |
Branch: |
public/18987 |
Dependencies: |
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Comment (by slabbe):
Is there a way to quotient two groups in Sage ?
{{{
sage: L = [w.matrix() for w in WeylGroup(['B',3]) if w.matrix().det()==1]
sage: G = MatrixGroup(L)
sage: H = MatrixGroup(L[:4])
sage: len(G)
24
sage: len(H)
4
sage: H
Matrix group over Rational Field with 4 generators (
[1 0 0] [ 1 0 0] [-1 0 0] [-1 0 0]
[0 1 0] [ 0 -1 0] [ 0 1 0] [ 0 -1 0]
[0 0 1], [ 0 0 -1], [ 0 0 -1], [ 0 0 1]
)
sage: G.quotient(H)
Traceback (most recent call last):
...
NotImplementedError:
}}}
--
Ticket URL: <http://trac.sagemath.org/ticket/18987#comment:24>
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