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Anixx
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117
Is the analysis as taught in universities in fact the analysis of definable numbers?
Oct 29, 2010
88
How to solve $f(f(x)) = \cos(x)$?
Nov 3, 2010
75
Is there any deep philosophy or intuition behind the similarity between $\pi/4$ and $e^{-\gamma}$?
Sep 13, 2019
45
What are some correct results discovered with incorrect (or no) proofs?
Nov 5, 2010
31
Why is the Gamma function shifted from the factorial by 1?
Oct 18, 2010
26
Do complex iterates of functions have any meaning?
Jul 27, 2011
23
Anti-delta function?
Jan 30, 2022
17
Are there any techniques for solving a differential equation of the form $f ' (x) = f( f( x ) )$?
Nov 1, 2012
16
Intuitive explanation why "shadow operator" $\frac D{e^D-1}$ connects logarithms with trigonometric functions?
Jan 1, 2021
16
What is the indefinite sum of tan(x)?
Oct 20, 2010
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102
Is it possible for information to be transmitted faster than light by using a rigid pole?
79
What are the lesser known Russian cases?
70
Why are so many metros underground? Isn't that more expensive than an elevated system?
67
Is there a general formula for solving Quartic (Degree $4$) equations?
53
Is the claim that Hitler came to power democratically justified?