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79/20 answers
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2d
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 $n$.
Jan
27
accepted Trigonometry book which develops geometric intuition.
Jan
22
accepted Every graph can be optimally colored greedily.
Jan
13
accepted Proof the Fibonacci numbers are not a polynomial.
Jan
12
accepted Quick way to check if a number is in a modular multiplicative cyclic group.
Jan
11
accepted Finding a non-piece wise function that gives us the $i$'th largest number.