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Fermat
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answer
139
Proof that every number ≥ $8$ can be represented by a sum of fives and threes.
Mar 8, 2015
answer
21
Calculate $\sum_{k=1}^n \frac 1 {(k+1)(k+2)}$
Jul 7, 2014
question
11
Does there exist a continuous function $f$ such that $f(x)+f(x^2)=x$ for $x\in[0,1]$?
Feb 15, 2020
answer
10
$1+1=0$ What am I doing wrong???!
Apr 8, 2015
answer
9
How do you solve $10^{-3/20}$ as $1/2^{1/2}$?
Mar 19, 2015
answer
8
Product of compact subsets of a topological group is compact
Jul 15, 2014
answer
8
The sum of the cubes of the reciprocal values of the roots of the equation $x^2+ax+1=0$ is?
May 27, 2015
question
8
Is there any positive function $f$ such that $f(x)f(y)\leq |x-y|$ for every $x$ rational and $y$ irrational? [duplicate]
Aug 17, 2017
answer
8
Showing divergence for $\sum^\infty_{n=1} \bigl(1-\cos (1/\sqrt n)\bigr)$
Mar 3, 2015
question
7
Existence of two functions $f$ and $g$ for which $f\circ g (x)=x^2 , g\circ f (x)=x^3$
Oct 27, 2018