#16534: Basic Block design methods
-------------------------------------+-------------------------------------
Reporter: brett | Owner:
Type: enhancement | Status: needs_work
Priority: major | Milestone: sage-6.4
Component: combinatorial | Resolution:
designs | Merged in:
Keywords: Block Design, | Reviewers:
Incidence Structure, Residual, | Work issues:
Derived, Complement, Supplement, | Commit:
Union | 13280d995c98d13fbf2b9637411d3988999453e1
Authors: Brett Stevens | Stopgaps:
Report Upstream: N/A |
Branch: u/brett/design |
Dependencies: #16553 |
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Comment (by ncohen):
Hello,
> I think I got them all this time.
You did.
> An incidence structure is group divisible iff its dual is resolvable so
the is_resolvable method can be used to determine if the IS is group
divisible. The question is if we find that a IS is group divisible, what
do we want to do. Do we want to store the groups as a part fo the IS?
From your question I wonder if we are talking about the same thing. I was
simply saying that we have a function `is_group_divisible_design` that
tells you if an incidence structure is a group divisible design. Is that
also what you have in mind?
In particular, I do not understand how that could be equivalent to finding
out whether the dual is resolvable: we have a `.is_resolvable` function,
but it is rather slow.
> I am using
>
> {{{
> git add src/sage/combinat/designs/incidence_structures.py
> git commit
> git trac push 16534
> }}}
>
> should I be doing something differently?
No, those commands look okay. It must be something that happened before.
Nathann
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Ticket URL: <http://trac.sagemath.org/ticket/16534#comment:33>
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