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For what k, matrix (k A - B) is positive semidefinite?

nov 30 10 at 7:58 Denis Serre 18.7k●1●31●93

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Expectation, multinomial distribution, and monotonicity (A conjecture)

dec 1 10 at 16:26 daizhuo 117●1●5

 
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How to write Matlab’s dot operators in mathematical expressions?

apr 26 11 at 5:27 hoangama1406 1

 
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How to characterize real square matrices A, such that v’Av >= 0, for all real vectors v with 1’v=0 (1 is the vector of all ones)?

jan 1 at 22:19 S. Sra 10k●1●16●44