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Dec 23, 2011 at 15:41 history edited Shahrooz CC BY-SA 3.0
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Dec 23, 2011 at 12:22 comment added Shahrooz Dear Choi, I know and understand your note. But, I am solving a quite difficult problem that the answer of this question can be very helpful. I don't want some professors solve this problem for me, but I will be so appreciate that they share their experiences with me. Three month ago, I solved a problem about Bandwidth of graph after 6 month effort and thinking, when I introduced the problem here, some of very helpful guidance, showed that this is another version of other problem in design theory. I think here is a place with name Mega-Experience and Idea Sharing. But thank you for your note.
Dec 23, 2011 at 12:09 comment added Yemon Choi Dear Shahrooz: MathOverflow is not meant to be a substitute for PhD supervision, not for the necessary process of solving one's own problems (or at least finding simpler versions that once can solve)
Dec 23, 2011 at 11:58 history edited Shahrooz CC BY-SA 3.0
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Dec 23, 2011 at 10:23 answer added Aaron Meyerowitz timeline score: 2
Dec 23, 2011 at 0:10 comment added Brendan McKay Your question is too vague for this forum. Now that you know your condition is same as being cospectral, do a google search for "cospectral graph" and you will find large amounts of information on it.
Dec 22, 2011 at 17:39 history edited Shahrooz CC BY-SA 3.0
added 131 characters in body; added 1 characters in body
Dec 22, 2011 at 17:22 comment added Chris Godsil As Igor notes, you have alreadu recieved an answer to this, from MacKay, in response to your question shahrooz.Janbaz (mathoverflow.net/users/19885), Operation on Isospectral graphs, mathoverflow.net/questions/83817 (version: 2011-12-18)
Dec 22, 2011 at 14:20 answer added Vincent Beffara timeline score: 5
Dec 22, 2011 at 14:13 answer added Igor Rivin timeline score: 4
Dec 22, 2011 at 13:53 history asked Shahrooz CC BY-SA 3.0