most recent 30 from http://mathoverflow.net 2013-05-24T01:59:31Z http://mathoverflow.net/feeds/user/31179 http://www.creativecommons.org/licenses/by-nc/2.5/rdf http://mathoverflow.net/questions/122723/the-number-of-specific-structure Mojtaba Jazaeri 2013-02-23T14:11:30Z 2013-02-24T06:19:41Z

<p>What is the number of families of $4t+1$ subsets of order $2t$ of the set ${1,2, \ldots ,p}$, where $p$ is a prime number which is equal to $4t+1$ and the order of intersection of each pair of the subsets is $t$ or $t-1$ and each subset has $t$-intersection with $2t$ subsets and $t-1$-intersection with the other $2t$ subsets?</p>

http://mathoverflow.net/questions/120857/the-number-of-non-isomorphic-strongly-regular-graphs-on-n-vertices Mojtaba Jazaeri 2013-02-05T13:46:03Z 2013-02-05T14:32:15Z

<p>What is the number of strongly regular graphs on $n$ vertices? or at least how many non-isomorphic strongly regular graphs can exist?</p>

http://mathoverflow.net/questions/122723/the-number-of-specific-structure Mojtaba Jazaeri 2013-02-23T14:12:30Z 2013-02-23T14:12:30Z

Thank you every one who answer to this question.

http://mathoverflow.net/questions/120857/the-number-of-non-isomorphic-strongly-regular-graphs-on-n-vertices/120861#120861 Mojtaba Jazaeri 2013-02-09T18:52:37Z 2013-02-09T18:52:37Z

As we know, every strongly regular graph over prime number of vertices is a conference graph and Paley graph is a conference graph and the following sentence due to Willem H. HAEMERS: For v = 5, 9, 13 and 17, the Paley graph is the only one with the given parameters. If $v \geq 25$, other graphs with the same parameters exist. in the following paper: Matrices for graphs, designs and codes Why this sentence is true? if this sentence is true, then there are at least 2 non-isomorphic strongly regular graphs on prime number of vertices $p&gt;25$.

http://mathoverflow.net/questions/120857/the-number-of-non-isomorphic-strongly-regular-graphs-on-n-vertices Mojtaba Jazaeri 2013-02-05T17:54:39Z 2013-02-05T17:54:39Z

Thank you very much Professor Chris Godsil and professor Aaron Meyerowitz.

http://mathoverflow.net/questions/120857/the-number-of-non-isomorphic-strongly-regular-graphs-on-n-vertices Mojtaba Jazaeri 2013-02-05T13:54:15Z 2013-02-05T13:54:15Z

Thank you for every one who answer to the question.