Mathematics
bof
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216
How to find a general sum formula for the series: 5+55+555+5555+.....?
Nov 16 '14
66
'Obvious' theorems that are actually false
Jun 5 '14
62
'Obvious' theorems that are actually false
Jun 5 '14
52
How to find the mod of this large number
Dec 13 '16
49
Can $18$ consecutive integers be separated into two groups,such that their product is equal?
Jan 15 '14
49
$\mathbb{R}$ with the lower limit topology is not second-countable
Feb 6 '15
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 '18
35
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 '13
34
Proofs of AM-GM inequality
Feb 21 '16
32
Can an uncountable group have a countable number of subgroups?
Dec 9 '18
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Responses tab on activity page doesn't work
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Mathematicians with both “very abstract” and “very applied” achievements
35
What is the general opinion on the Generalized Continuum Hypothesis?
35
Mathematicians with both “very abstract” and “very applied” achievements
25
Widely accepted mathematical results that were later shown to be wrong?
23
List Ramsey numbers?

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