User pratik deoghare - MathOverflow most recent 30 from http://mathoverflow.net 2013-06-18T07:26:37Z http://mathoverflow.net/feeds/user/5360 http://www.creativecommons.org/licenses/by-nc/2.5/rdf http://mathoverflow.net/questions/83044/proof-of-infinitude-of-primes-whose-reversal-in-base-10-is-also-prime Proof of infinitude of primes whose reversal in base 10 is also prime Pratik Deoghare 2011-12-09T09:19:35Z 2011-12-09T14:34:54Z <p>Is there any proof of infinitude of <a href="http://oeis.org/A007500" rel="nofollow">A007500</a> primes?</p> <p>If you want to generate them here is trivial and naive python program.</p> <pre><code>def is_prime(n): i = 2 while i*i &lt;= n: if n%i == 0: return False i = i + 1 else: return True print [x for x in range(1,200) if is_prime(x) and is_prime(int(str(x)[::-1]))] </code></pre> http://mathoverflow.net/questions/40454/practical-applications-of-eigenvalues-and-eigenvectors/75758#75758 Answer by Pratik Deoghare for practical applications of eigenvalues and eigenvectors Pratik Deoghare 2011-09-18T16:33:26Z 2011-09-18T16:33:26Z <p><a href="http://20bits.com/articles/graph-theory-part-iii-facebook/" rel="nofollow">Measurements of Social Influence</a></p> http://mathoverflow.net/questions/23748/where-on-the-internet-i-can-find-database-of-graphs Where on the internet I can find database of graphs? Pratik Deoghare 2010-05-06T17:09:58Z 2010-07-15T20:46:20Z <p>I am studying graph algorithms.</p> <p>I need database of graphs on which I can test my algorithms. </p> <p>Where can I find reliable database of graphs of all kinds?</p> <p>Thanks!</p> http://mathoverflow.net/questions/31881/algorithm-for-finding-mesh-subgraphs Algorithm for finding mesh subgraphs? Pratik Deoghare 2010-07-14T18:06:55Z 2010-07-14T18:47:35Z <p>I have a dense unlabeled graph ( each vertex has got at least 4 incident edges ).</p> <p>Number of vertices (V) of the graph is always a perfect square.</p> <p>I want to find all the meshes of $\sqrt{v} {x} \sqrt{v}$ in it.</p> <p>Are there any known algorithms to accomplish this? </p> <p>Any help is appreciated. </p> <p>Thanks! </p> http://mathoverflow.net/questions/31879/are-there-other-nice-math-books-close-to-the-style-of-tristan-needham/31884#31884 Answer by Pratik Deoghare for Are there other nice math books close to the style of Tristan Needham? Pratik Deoghare 2010-07-14T18:22:07Z 2010-07-14T18:22:07Z <p>My favorite along with the Visual Complex Analysis by Tristan Needham</p> <p>is <a href="http://www.amazon.com/Div-Grad-Curl-All-That/dp/0393969975" rel="nofollow">Grad, Div, Curl and all that by H. M. Schey</a></p> <p><img src="http://ecx.images-amazon.com/images/I/41DVQ2MTNNL._SL500_AA300_.jpg" alt="alt text"></p> <p><strong>NOTE: <a href="http://www.literature.org/authors/carroll-lewis/alices-adventures-in-wonderland/" rel="nofollow">Alice's Adventures in Wonderland by Lewis Carroll</a> is still <em>the best mathematical book</em> I have ever read.</strong></p> http://mathoverflow.net/questions/31838/intuitions-connections-examples-for-eigen/31843#31843 Answer by Pratik Deoghare for Intuitions/connections/examples for "eigen-*" Pratik Deoghare 2010-07-14T12:21:53Z 2010-07-14T12:21:53Z <p><a href="http://videolectures.net/mit1806s05_strang_lec21/" rel="nofollow">One incredibly cool lecture by Prof. Gilbert Strang about Eigenvalues and Eigenvectors.</a> </p> http://mathoverflow.net/questions/26967/how-to-become-a-good-mathematician How to become a good mathematician? Pratik Deoghare 2010-06-03T20:47:47Z 2010-06-03T22:50:43Z <p><a href="http://www.phys.uu.nl/~thooft/theorist.html" rel="nofollow">HOW to BECOME a GOOD THEORETICAL PHYSICIST by Gerard 't Hooft (Nobel Prize Winner)</a></p> <p>Is there similar "How to become a good mathematician by <strong>__</strong>"?</p> <p><em>Humble Suggestion : Why not build it here?</em></p> http://mathoverflow.net/questions/35215/how-to-construct-a-1-10-probability-with-a-dice Comment by Pratik Deoghare Pratik Deoghare 2010-08-11T12:48:19Z 2010-08-11T12:48:19Z Post it here <a href="http://math.stackexchange.com" rel="nofollow">math.stackexchange.com</a> http://mathoverflow.net/questions/31881/algorithm-for-finding-mesh-subgraphs/31888#31888 Comment by Pratik Deoghare Pratik Deoghare 2010-07-14T21:03:25Z 2010-07-14T21:03:25Z Oh no! I have 256 nodes i.e. 256! possibilities. Yet another attempt to make a million dollars failed. Thanks! :D http://mathoverflow.net/questions/31879/are-there-other-nice-math-books-close-to-the-style-of-tristan-needham/31884#31884 Comment by Pratik Deoghare Pratik Deoghare 2010-07-14T20:41:33Z 2010-07-14T20:41:33Z @Andres Caicedo: Great link! Thanks! http://mathoverflow.net/questions/26967/how-to-become-a-good-mathematician Comment by Pratik Deoghare Pratik Deoghare 2010-06-03T20:58:33Z 2010-06-03T20:58:33Z I don't think I have added the right tags. Please,help! http://mathoverflow.net/questions/24526/good-papers-books-essays-about-the-thought-process-behind-mathematical-research Comment by Pratik Deoghare Pratik Deoghare 2010-05-13T21:21:07Z 2010-05-13T21:21:07Z @Qiaochu Yuan Thanks for the great link. :D Why don't you post that link as an answer? http://mathoverflow.net/questions/22221/what-is-the-difference-between-isomorphism-and-automorphism-of-graphs Comment by Pratik Deoghare Pratik Deoghare 2010-04-22T17:49:58Z 2010-04-22T17:49:58Z @Robin Chapman : Suppose I have a graph that looks like triangle then I can rotate it 3 times through 120 degrees to resemble itself. Does it mean it has 3 symmetries and hence 3 automorphism? http://mathoverflow.net/questions/22221/what-is-the-difference-between-isomorphism-and-automorphism-of-graphs Comment by Pratik Deoghare Pratik Deoghare 2010-04-22T17:26:23Z 2010-04-22T17:26:23Z @Nate Eldredge How do I find an automorphism for simplest case? Should I not ask such questions here? http://mathoverflow.net/questions/22221/what-is-the-difference-between-isomorphism-and-automorphism-of-graphs Comment by Pratik Deoghare Pratik Deoghare 2010-04-22T17:15:12Z 2010-04-22T17:15:12Z But any graph is isomorphic to itself, isn't it? Then what is the point of defining automorphism?