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1h
reviewed Approve A not so hard basic calculus problem? But it appears to be very lengthy
1h
reviewed Approve A is a square matrix and given that $A^3 = 2\mathbb{I}$, then show $A-\mathbb{I}$ is invertible and find its inverse
2h
reviewed Reject Prove that the four roots of unity form an abelian multiplicative group
2h
reviewed Reject Prove that the four roots of unity form an abelian multiplicative group
2h
reviewed Approve If $\mathbf{E}(e|x) = 0$, then $\mathbf{E}(h(x)e) = 0$ for any function $h(x)$
4h
reviewed Approve convergence of $f(x+y)$ to $f(x)$ for $y >$ to $0$ in $L^1$.
4h
reviewed Reject Second order PDE with initial condition
5h
reviewed Approve How to proceed from $\cot(x)\cot(2x)-\cot(2x)\cot(3x)-\cot(3x)\cot(x) = 1$
5h
reviewed Reject maximum likelihood estimators of a shifted gamma distribution?
6h
reviewed Approve Real life applications of general vector spaces
10h
reviewed Reject Prove that for any integer $n$, if $b^2$ divides $n$, then $b$ divides $n$.
10h
reviewed Approve Function $\phi (x,y) \mapsto \phi (u,v)$ [ie:…] under the transformation $f(z) = u(x,y) + v(x,y)$ where $f(z)$ is analytic & $d_z \,f(z)$ is not $0$
11h
reviewed Approve Use the Euclidean Algorithm to show the $\gcd(56,72)|40$
11h
reviewed Approve List all the permutations for the letters $a,c,t$
12h
reviewed Approve Runge-Kutta 4 failure?
12h
reviewed Reject how to prove this statement related to radius of convergence
15h
reviewed Approve Is $\log (t^2 (l/c)) = \log (t^2) \log (l/c)$?
15h
reviewed Approve Find $\lim x^2+2x-1=7$ as $x \rightarrow 2$ using epsilon-delta proof.
15h
reviewed Approve Maximum of polynomial
15h
reviewed Reject what is the worst $\pi$ computation algorithm