Hi Dror,

dror fidler wrote:
> i recently used is_distance_regular() in the graph package.
> however the definition of the function in the documentation page does
> not fit the definition of distance regular graphs. i would be very
> interested to find the source of the information the author used for
> this alternative definition. the wikipedia page they refer to does not
> trivially show this relation.

To find who added some particular piece of code to Sage, use "git blame" 
on the file containing the code. In our case,

$ git blame src/sage/graphs/distances_all_pairs.pyx

reveals that is_distance_regular() was added by Nathann Cohen as part of 
commit 4d84feb2a, implementing trac ticket #14619.

You can then find more information on the ticket's page:

http://trac.sagemath.org/ticket/14619

Hope this helps,

-- 
Marc

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