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May
21
comment $x^TAx=0$ for all $x$ when $A$ is a skew symmetric matrix
@Mollart yes, or, just think about it this way: how can a = -a?
May
4
awarded  Steward
May
4
revised Does $0$ correlation imply independence for marginally normal distributions?
rolled back to a previous revision
May
4
reviewed Close How do I construct a chart to a infinitely long cylinder embedded in $\mathbb{R}^3$?
May
4
reviewed Close How do we get $S(m) = S(m/2) + \lg m$ from $T(n) = T(\sqrt{n}) + \lg\lg n$?
May
4
reviewed Leave Open Local informatics Olympiad and Algorithm
May
4
reviewed Close The function $f(x)$ is defined on the real numbers has the property that $f(f(x)) ( 1+f(x)) = - f(x)$ for all $x$ in the domain of $f$ .
May
4
reviewed Close All entire functions which satisfying : $f(2z)=f(z)^{2}$
May
4
reviewed Close Compute $\frac{1}{e}\sum\limits_{n=0}^{\infty}\frac{n^{k}}{n!}$ for $k=0, 1, 2 … $
May
4
reviewed Leave Open How to find this integral from Gaussian integral?
May
4
reviewed Close Find all functions $f: \mathbb{Z} \to \mathbb{Z} $ such that for all $x,y, \in \mathbb{Z}$, $f(x-y+f(y))=f(x)+f(y)$.
May
4
reviewed Close Given five points and a line find the points of the line that lie in the conic through the five points
May
4
reviewed Close An isometry of Hilbert spaces using the Radon-Nikodym derivative
May
4
reviewed Close Linear Regression and finding Correlation Coefficient
Apr
24
reviewed Leave Open Covering relation over functions
Apr
24
reviewed Close Cup product Structure of $X \vee Y $
Apr
24
reviewed Leave Open Complex Number to a power
Apr
24
reviewed Leave Open Surgery to unlink $S^1$ and $S^2$ in $S^4$
Apr
24
reviewed Close Inequality with poisson r.v.
Apr
24
reviewed Close What radius circle to remove from unit circle to make golden earring?