Mathematics
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bof
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All Questions Answers
Score Newest
answer
219
How to find a general sum formula for the series: 5+55+555+5555+.....?
Nov 16, 2014
answer
71
'Obvious' theorems that are actually false
Jun 5, 2014
answer
65
'Obvious' theorems that are actually false
Jun 5, 2014
answer
51
Can $18$ consecutive integers be separated into two groups,such that their product is equal?
Jan 15, 2014
answer
51
How to find the mod of this large number
Dec 13, 2016
answer
50
$\mathbb{R}$ with the lower limit topology is not second-countable
Feb 6, 2015
answer
43
A simple finite combinatorial sum I found, that seems to work, would have good reasons to work, but I can't find in the literature.
Dec 6, 2018
answer
42
If $\lvert\operatorname{Hom}(H,G_1)\rvert = \lvert\operatorname{Hom}(H,G_2)\rvert$ for any $H$ then $G_1 \cong G_2$
Dec 22, 2013
answer
39
Proofs of AM-GM inequality
Feb 21, 2016
answer
33
Is this graph a planar graph or not?
Oct 17, 2017
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Mathematicians with both “very abstract” and “very applied” achievements
38
Mathematicians with both “very abstract” and “very applied” achievements
35
What is the general opinion on the Generalized Continuum Hypothesis?
27
What is the highest number of different mates in 1 you can have in one (legal) position?
26
Widely accepted mathematical results that were later shown to be wrong?

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