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Apr
20
awarded  Popular Question
Apr
11
asked if $f$ is in Banach space, then $\nabla f $ is in the dual space?
Mar
30
revised Is $ \frac{ x^T A A x }{ 1+ x^TAx} $ is upperbounded by the biggest eigenvalue of $A$?
added 14 characters in body
Mar
30
comment Is $ \frac{ x^T A A x }{ 1+ x^TAx} $ is upperbounded by the biggest eigenvalue of $A$?
Sry I forgot to mention: $A$ is psd. updated.
Mar
30
comment Is $ \frac{ x^T A A x }{ 1+ x^TAx} $ is upperbounded by the biggest eigenvalue of $A$?
I attached the source of the claim.
Mar
30
comment Is $ \frac{ x^T A A x }{ 1+ x^TAx} $ is upperbounded by the biggest eigenvalue of $A$?
Good point. I also attached the source to the question.
Mar
30
comment Is $ \frac{ x^T A A x }{ 1+ x^TAx} $ is upperbounded by the biggest eigenvalue of $A$?
Yes, I think you are right.
Mar
30
revised Is $ \frac{ x^T A A x }{ 1+ x^TAx} $ is upperbounded by the biggest eigenvalue of $A$?
added 164 characters in body
Mar
30
asked Is $ \frac{ x^T A A x }{ 1+ x^TAx} $ is upperbounded by the biggest eigenvalue of $A$?
Mar
30
accepted Does $a \leq b + c $ imply $a^2 \leq (b+c)^2 + (b-c)^2$?
Mar
30
asked Does $a \leq b + c $ imply $a^2 \leq (b+c)^2 + (b-c)^2$?
Mar
8
accepted Inverse of a special matrix
Mar
7
asked Inverse of a special matrix
Jan
23
asked The expected number of mutations in a sequence of elements, each with random delays
Jan
12
accepted Prove $\mathbb{P}( k < l/2 ) \geq \frac{l}{2} \times \mathbb{P}( k = l/4 ) $ for binomial variable $k$
Jan
12
asked Prove $\mathbb{P}( k < l/2 ) \geq \frac{l}{2} \times \mathbb{P}( k = l/4 ) $ for binomial variable $k$
Dec
19
awarded  Caucus
Dec
14
accepted For what sequences $a_n$ does the sequence $(1+\alpha a_n)^n$ converge?
Dec
14
comment For what sequences $a_n$ does the sequence $(1+\alpha a_n)^n$ converge?
oh I see. thanks!
Dec
14
comment For what sequences $a_n$ does the sequence $(1+\alpha a_n)^n$ converge?
Why is it that for $\beta < 1$ the limit would be undefined?