#19279: IncidenceStructure.is_generalized_quadrangle
-------------------------------------+-------------------------------------
Reporter: ncohen | Owner:
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-6.9
Component: combinatorial | Resolution:
designs | Merged in:
Keywords: | Reviewers:
Authors: Nathann Cohen | Work issues:
Report Upstream: N/A | Commit:
Branch: u/ncohen/19279 | 2a5609463a71f7baab5a9f028112bab3de20fd36
Dependencies: #19277 | Stopgaps:
-------------------------------------+-------------------------------------
Comment (by dimpase):
Replying to [comment:17 ncohen]:
> > [...] and any two vertices x,y at distance
> > i < n have c_j(x,y) = 1.
>
> What the hell is this `c_j(x,y)`. Number of shortest paths? `:-/`
for x, y at distance j+1, it is number of neighbours of y in diameter j
neighbourhood of x.
E.g. mu in SRG is c_2.
It is one of parameters of a distance-regular graph, no wonder it's used
freely in [BCN]_
----
New commits:
||[http://git.sagemath.org/sage.git/commit/?id=415fffc56fb24d5495cfa52c99e69a3f94b7ecd0
415fffc]||{{{trac #19279: Merged with 6.9.rc0}}}||
||[http://git.sagemath.org/sage.git/commit/?id=2a5609463a71f7baab5a9f028112bab3de20fd36
2a56094]||{{{trac #19279: Settling the definition issue}}}||
--
Ticket URL: <http://trac.sagemath.org/ticket/19279#comment:21>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
--
You received this message because you are subscribed to the Google Groups
"sage-trac" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To post to this group, send email to [email protected].
Visit this group at http://groups.google.com/group/sage-trac.
For more options, visit https://groups.google.com/d/optout.
