Changes between Initial Version and Version 19 of Ticket #16370


Ignore:
Timestamp:
06/03/14 19:51:47 (7 years ago)
Author:
vdelecroix
Comment:

Replying to ncohen:

[...]

Tell me if my answers above convinced you.

Yes: this ticket should not go without a graphs.IntersectionGraph. And intersection graphs of non-trivial BIBD are regular graph. So it is worth to have them at least in the doc of graphs.IntersectionGraph.

For the parameters: they are explicit in terms of (k,n) for TD and (v,k) for BIBD.

  • for TD(k,n): lambda=(k-1)(k-2)+n-2, mu=k(k-1)
  • for BIBD(v,k): lambda=(k-1)2+(v-1)/(k-1)-2, mu=k2

and this should be mentioned and tested.

By the way, why is there no BIBD in the Brouwer table?

Vincent

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  • Ticket #16370

    • Property Status changed from new to needs_work
    • Property Commit changed from to 90a72bd39d74c24cb548e5b7dc5995c67ac386f8
    • Property Branch changed from to u/ncohen/16370
  • Ticket #16370 – Description

    initial v19  
    33Brouwer's website is filled with references to "OA" `:-)`
    44
    5 http://www.win.tue.nl/~aeb/graphs/srg/srgtab251-300.html
    6 http://www.win.tue.nl/~aeb/graphs/OA.html
     5- http://www.win.tue.nl/~aeb/graphs/srg/srgtab251-300.html
     6- http://www.win.tue.nl/~aeb/graphs/OA.html
    77
    88Nathann