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 Enlightened
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Oct
9
comment Show that $\ln(a+b) =\ ln(a) + \ln(b)$ when $a = \frac{b}{b-1}$
Assuming $a$ and $b$ are positive, $\ln(a) + \ln(b) = \ln(a b)$. Since $\ln$, as a function of positive reals is increasing, $\ln(a+b) = \ln(a b)$ is only true if $a+b = a b$. Now solve for $a$.
Oct
8
awarded  Nice Answer
Oct
6
comment Is Cramer's rule efficient for computational point of view?
That's only if the deteminant is computer by definition. It may be computed by LU decomposition as well, in which case the complexity would be $O(n^4)$.
Sep
11
answered Probability of selecting a specific card from a split deck
Sep
7
answered Binomial Probabilities
Sep
4
comment Why do both sine and cosine exist?
@leftaroundabot It is_particle_ physics...
Aug
23
awarded  Good Answer
Aug
23
revised What is the gradient of $f=\| S-ABA^T \|^2$?
Added a link to Frobenius product on wikipedia.
Aug
22
comment What is the gradient of $f=\| S-ABA^T \|^2$?
what do you denote by $h$?
Aug
8
revised A theta function around its natural boundary
added 1 character in body
Aug
8
revised A theta function around its natural boundary
edited body
Aug
4
answered Get the distribution of $X|Y=y$ given this joint probability density function
Jul
29
revised Solving a SDE / Finding expectation Value
deleted 3 characters in body
Jul
29
comment Is $\left(45+29\sqrt{2}\right)^{1/3} + \left(45-29\sqrt{2}\right)^{1/3}$ an integer?
Wolfram|Alpha even offers step-by-step simplification to the integer value.
Jul
29
answered Solving a SDE / Finding expectation Value
Jul
23
comment Is there one to one relation Positive definite(PD) matrix and PD function?
@Creator I meant sphere, plane, their subsets, or some other domains.
Jul
23
comment Is there one to one relation Positive definite(PD) matrix and PD function?
@Creator Do you require the purported function to have any specific domain, like $\mathbb{R}^2$ or $\mathbb{S}^2$?
Jul
23
comment Is there one to one relation Positive definite(PD) matrix and PD function?
Any requirements at to the P.D. function domain?
Jul
1
awarded  Enlightened
Jun
30
awarded  Nice Answer