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Apr
18
awarded  Excavator
Apr
18
revised How to prove $\cos \frac{2\pi }{5}=\frac{-1+\sqrt{5}}{4}$?
Corrected final expression
Mar
20
awarded  Yearling
Jan
3
awarded  Vox Populi
Jan
3
awarded  Talkative
Jan
3
awarded  Suffrage
Dec
21
reviewed No Action Needed Darboux's theorem of several variables
Dec
21
reviewed Close Matrix with orthogonal columns?
Dec
21
reviewed Approve Is Lyapunov equation always solvable with A as a negative definite matrix?
Dec
21
reviewed Approve Restrictions on universal specification (in first-order logic)?
Dec
21
reviewed Reject Is this true? $(1+1/n)^n=1+1/1!+1/2!+1/3!+1/4!+\cdots + 1/n!$
Dec
21
reviewed Approve Extended version of the boundedness theorem: $f$ attains its bounds $\inf$ and $\sup$ of $\{f(x) | x \in [a,b]\}$
Dec
21
reviewed Reviewed Infiniteness of non-twin primes.
Dec
21
reviewed Looks OK Let $x,y,z$ be integers and $11$ divides $7x+2y-5z$. Show that $11$ divides $3x-7y+12z$.
Dec
21
reviewed No Action Needed In a family with two children, what are the chances, if one of the children is a girl, that both children are girls?
Dec
21
reviewed Close functional equations with restricted domain
Dec
21
reviewed Close random thought: are some infinite sets larger than other
Dec
21
reviewed No Action Needed $L^2$ method to solve the PDE $\bar{\partial}u=f$, where $f\in L^{ 2 }_{ (0,p) }(\Omega )$
Dec
21
reviewed Close Consider $P(n)$ as a number of $n$-permutations, which each cycle have even length, and …
Dec
21
reviewed Approve Probability that a geyser erupts