Mathematics
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san
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View all questions and answers
All Questions Answers
Score Newest
answer
17
Numbers having in decimal representation no common digits with all their proper divisors
May 21, 2015
answer
15
Find all primes $p,q$ such that $p^3+p=q^7+q$
May 11, 2017
answer
11
Does this system of simultaneous Pell-like equations have any non-trivial positive integer solutions?
Apr 21, 2016
answer
10
Why $6$ races are not sufficient in the $25$ horses, $5$ tracks problem
Aug 12, 2015
answer
9
Smooth vector fields form a $C^\infty (M)$-module
Jun 8, 2019
answer
9
When two projections in a C*-algebra are "almost" Murray-von Neumann equivalent, they are equivalent
Apr 27, 2015
answer
9
How to find the Riemannian Distance on the Sphere $S^n\subset \Bbb{R}^{n+1}$
Oct 4, 2017
answer
8
Equality by iteratively applying $(a,b)\rightarrow [(a+1,2b)\text{ or }(2a,b+1)]$?
Apr 22, 2015
answer
8
Which string can't be accessed?
Sep 28, 2017
answer
7
How prove this inequality $(a+b)^rb^{2n-r}\le\dfrac{n}{4}+r,$
Jun 19, 2017

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