Gamamal
Reputation
29,342
366/400 score
 May31 accepted Finding all solutions to $x^2+y^2=2010$ May29 accepted Integers of the form $x^2+2y^2$. May29 accepted Topology problem I invented (characterizing spaces in which every open set is closed) May26 accepted Product of two integers of the form $x^2+my^2$ is of the same form. May25 accepted A countable Tychonoff space is normal? May14 accepted Theoretical way to prove no positive integer $n$ exists such that $n+3$ and $n^2+3n+3$ are both perfect cubes. May13 accepted Cute convergence problem. Proving convergence of sequence regarding reciprocals of least common multiple converges. Apr17 accepted Albert, Bernard and Cheryl popular question (Please comment on my theory) Apr7 accepted How can we detect if a topological space has “holes”. Apr7 accepted Can the sum of reciprocals of a set without density converge? Mar16 accepted Cute problem a computer science classmate shared (adding non-coprimes to n smaller than n as fast as possible) Mar8 accepted Proving for every subset $A$ of $X$ $Int(Cl(A))$ is a regular open set. Mar6 accepted Is there a simple way to know whether the collection of all objects of a certain type is a set? Feb27 accepted Maximum weight of a topology on $\{ 1 , 2 , 3 , \ldots , n \}$ Feb27 accepted Topology in which there is a subbase smaller than any base. Feb24 accepted Really cute counting problem (Finding the $k$'th $n$-Champkowski number) Feb18 accepted Number theory text that uses algebra? Feb11 accepted Simple counting problem I invented (counting ways to end a board game) Feb11 accepted Does a positive constant $\nu$ exist so that $\varphi(n)>\nu\cdot n$ for all $n$? Feb5 accepted Solving inequality involving square root and division by logarithm.