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View:  Topic list, Topic summary Topics 1 - 10 of 194025  Older »
Description: Mathematical discussions and pursuits.
 

Eigenvalues of Nonnegative Matrices (Frobenius Theorem) 
  Hello, let A be a real nxn nonnegative matrix (that is, all the entries of A are non negative numbers) with Frobenius eigenvalue f>0. Denote with D(k_1,...,k_n) the diagonal matrix whose i-th diagonal entry is k_i>=0. The problem is the following: can you find all the n-tuples (k_1,...,k_n) such that the Frobenius eigenvalue of... more »
By Maury Barbato  - 7:14am - 1 new of 1 message    

Top quark was an atom of tungsten, not lead? #34 Chemical Elements replacing Standard Model 
  ...On several of Wikipedia's sites such as Top Quark and another site, Wikipedia mentions an alleged fact. I cannot vouch for the truth or falsity of this fact they mention. They mention that the energy of the Top Quark is equivalent to an atom of Tungsten. I have listed an atom of Lead Pb208 as the equivalent atom... more »
By Archimedes Plutonium  - 6:03am - 1 new of 1 message    

Mathematics of Global warming 
  [link] Besides all the hoopla with the global warming extremists I saw the wiki page above describing the meteorological example. Can one consider this a mathematical proof that hurricanes must exist? That is, because there is at least one point of "no wind" at any given time it is... more »
By Jon Slaughter  - 5:24am - 3 new of 3 messages    

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By Pearson & prentice hall solutions  - 5:06am - 1 new of 1 message    

Find all the aa...aabb...bb square numbers 
  We should find all the perfect squares with 2n digits in which the first n and the last n digits are the same. (For example: 16, 25, 36, 49, 64, 81 and also 88^2=7744 are "good" numbers.)
By James Bond  - 4:54am - 2 new of 2 messages    

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  "finland jobs" "google finland jobs" "helsinki finland jobs" "finland jobs english" "jobs in finland for foreigners" "jobs in finland for english" "jobs finland" [link] "finland jobs" "google finland jobs" "helsinki finland jobs" "finland jobs english" "jobs in finland for foreigners" "jobs in finland for... more »
By saima81  - 4:43am - 1 new of 1 message    

P = NP latest from ArXiv 
  source: [link] First, interesting algorithms: F (string input) // F is a restricted type X program, for Q’ (f) is supposed to run in time P (n) { concurrent_ifs // only one of the returns can close the concurrent instructions block below, where the two ifs run concurrently... more »
By 74660@deadaddress.com  - 4:03am - 1 new of 1 message    

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By tradeyoyo  - 4:02am - 2 new of 2 messages    

◑△◐ 2009 ED Hardy T-shirt cheap wholesale at www.fjrjtrade.com <paypal payment> 
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By www.fjrjtrade.com  - 3:37am - 2 new of 2 messages    

independent 
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By KY  - 2:24am - 3 new of 3 messages    

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