Reputation
28,215
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359/400 score
260/80 answers
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2h
accepted Topology problem I invented (characterizing spaces in which every open set is closed)
May
26
accepted Product of two integers of the form $x^2+my^2$ is of the same form.
May
25
accepted A countable Tychonoff space is normal?
May
14
accepted Theoretical way to prove no positive integer $n$ exists such that $n+3$ and $n^2+3n+3$ are both perfect cubes.
May
13
accepted Cute convergence problem. Proving convergence of sequence regarding reciprocals of least common multiple converges.
Apr
17
accepted Albert, Bernard and Cheryl popular question (Please comment on my theory)
Apr
7
accepted How can we detect if a topological space has “holes”.
Apr
7
accepted Can the sum of reciprocals of a set without density converge?
Mar
16
accepted Cute problem a computer science classmate shared (adding non-coprimes to n smaller than n as fast as possible)
Mar
8
accepted Proving for every subset $A$ of $X$ $Int(Cl(A))$ is a regular open set.
Mar
6
accepted Is there a simple way to know whether the collection of all objects of a certain type is a set?
Feb
27
accepted Maximum weight of a topology on $\{ 1 , 2 , 3 , \ldots , n \}$
Feb
27
accepted Topology in which there is a subbase smaller than any base.
Feb
24
accepted Really cute counting problem (Finding the $k$'th $n$-Champkowski number)
Feb
18
accepted Number theory text that uses algebra?
Feb
11
accepted Simple counting problem I invented (counting ways to end a board game)
Feb
11
accepted Does a positive constant $\nu$ exist so that $\varphi(n)>\nu\cdot n$ for all $n$?
Feb
5
accepted Solving inequality involving square root and division by logarithm.
Feb
3
accepted Using two coins to select a person fairly.
Jan
28
accepted Finding all continuous functions so that $f^n(x)=x$ for some $n$.