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coudy
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answer
168
Do you know important theorems that remain unknown?
Mar 29, 2018
question
110
What is the oldest open problem in mathematics?
Jun 4, 2010
question
91
Injectivity implies surjectivity
Jul 4, 2017
answer
71
Demystifying complex numbers
Jul 1, 2010
answer
62
Endless controversy about the correctness of significant papers
Oct 5, 2017
answer
44
Why are there so many fractional derivatives?
Nov 4, 2017
answer
39
A book about mathematical drawing on the blackboard
Feb 11, 2023
answer
37
Do empirical studies have a place in contemporary mathematics research?
Feb 25, 2023
answer
34
Why is the Hahn-Banach theorem so important?
May 31, 2010
answer
34
Which math paper maximizes the ratio (importance)/(length)?
May 21, 2010
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Companies accounts allowed?
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Best way to correct "Cauchy-Schwarz" misspellings
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News of potential interest to the MO community
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Why all the negativity?
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Any other site besides mathoverflow and mathematics stackexchange?
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16
Did Paul Halmos state “The heart of mathematics consists of concrete examples and concrete problems"?
15
What are examples of Halmos's claim that a single small concrete special case can capture every instance of a concept of great generality?
13
Is there a non trivial smooth function that has uncountably many roots?
12
Irreducibility of $x^8+6x^4+1$
9
The fields ${\mathbb Q}[\sqrt[3]{3+\sqrt{2}}]$ and ${\mathbb Q}[\sqrt[3]{3-\sqrt{2}}]$ are different?