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Dec
16
reviewed Leave Open Can we always multiply some function that is not differentiable everywhere with function that is to obtain differentiable product?
Dec
16
reviewed Leave Open Solution about a Michael Aschbacher exercise [edit]
Dec
16
reviewed Leave Open Is there a non-trivial cyclic quotient group of a non-cyclic group?
Feb
23
reviewed Close an inequality in Banach algebra
Feb
23
reviewed Leave Open Approximate the size of a set given random items from the set.
Feb
23
reviewed Leave Open I want to find a topologicaly embedding $f : X \rightarrow Y$ and $g: Y \rightarrow X$, yet $X$ is not homeomorphic to $Y$.
Feb
23
reviewed Leave Open Let $(X,d)$ be a compact metric space. Let $f: X \to X$ be such that $d(f(x),f(y)) = d(x,y)$ for all $x,y \in X$. Show that $f $ is onto (surjective).
Feb
13
reviewed Leave Open Real Analysis, using Zorns Lemma
Jan
26
reviewed Close Logic - how to write $\exists !x$ without the $\exists !$ symbol
Oct
30
reviewed Approve How to prove this inequality $\frac{a_{1}a_{2}+a_{2}a_{3}+\cdots+a_{n-1}a_{n}}{a^2_{1}+a^2_{2}+\cdots+a^2_{n}}\le\cos{\frac{\pi}{n+1}}$
Oct
16
reviewed Approve coordinate geometry high level problems
Oct
7
reviewed Approve infinitely many solutions to $\displaystyle x^n + y^n = z^{n+1}$
Jun
19
reviewed Looks OK $R[x]$ can be an integral extension of $R$?
Jun
19
reviewed Reject For $R$-modules $M,N$, what are sufficient conditions for $\operatorname{Supp}(M\otimes_R N)\subseteq \operatorname{Supp}(\operatorname{Hom}_R(M,N))$?
Jun
19
reviewed Reject Noetherian ring and prime ideal contained in an invertible maximal ideal.
Jun
19
reviewed Leave Open 3 random numbers to describe point on a sphere
Jun
19
reviewed Leave Open Ring of linear transformations modulo finite rank transformations
Jun
19
reviewed Approve An elegant description for graded-module morphisms with non-zero zero component
May
25
reviewed Approve Find a matrix $P$ that orthogonally diagonalizes $A$ and determine $P^{-1}AP$
May
13
reviewed Approve Continuous probability distribution with no first moment but the characteristic function is differentiable