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Mathematics
José Carlos Santos's user avatar
José Carlos Santos's user avatar
José Carlos Santos's user avatar
José Carlos Santos
  • Member for 7 years, 2 months
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I am a mathematician who works at the University of Porto (Portugal). My PhD, on Representation Theory, was obtained at the Université Paris — Denis Diderot, in 1996.

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186
Why not include as a requirement that all functions must be continuous to be differentiable?
Jun 19, 2018
130
Unexpected examples of natural logarithm
Jul 3, 2017
93
How can a "proper" function have a vertical slope?
Oct 5, 2019
90
Does an increasing sequence of reals converge if the difference of consecutive terms approaches zero?
Feb 17, 2019
85
Can a binary operation have an identity element when it is not associative and commutative?
Jun 20, 2017
83
Unsolved Problems due to Lack of Computational Power
Aug 16, 2019
67
Why a $20$ digit number starting with eleven $1$'s cannot be a perfect square?
Jun 26, 2017
65
False proof that $ρe^{iθ} = ρ$ and so complex numbers do not exist?
Dec 27, 2017
61
Proving $\left(1-\frac13+\frac15-\frac17+\cdots\right)^2=\frac38\left(\frac1{1^2}+\frac1{2^2}+\frac1{3^2}+\frac1{4^2}+\cdots\right)$
Oct 2, 2017
55
What is an example of a sequence which "thins out" and is finite?
Nov 13, 2019
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66
Don't review a first question by simply downvoting it or voting to close it
27
Should duplicate questions be deleted?
24
Common problem: OP deletes question immediately upon receiving answer
17
Tag management 2020
16
Tag management 2022
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182
Why was "An Update to our Community and an Apology" deleted?
48
Why were the Allies so much better cryptanalysts?
35
Story of a student who solves an open problem
33
What is the context for Napoleon's quote "[the Austrians] did not know the value of five minutes"?
31
Could a German insult Hitler without being arrested?