Mathematics
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José Carlos Santos
  • Member for 5 years
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About

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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All Questions Answers
Score Newest
answer
156
Why not include as a requirement that all functions must be continuous to be differentiable?
Jun 19, 2018
question
117
Unexpected examples of natural logarithm
Jul 3, 2017
answer
88
How can a "proper" function have a vertical slope?
Oct 5, 2019
answer
86
Does an increasing sequence of reals converge if the difference of consecutive terms approaches zero?
Feb 17, 2019
answer
84
Can a binary operation have an identity element when it is not associative and commutative?
Jun 20, 2017
answer
78
Unsolved Problems due to Lack of Computational Power
Aug 16, 2019
answer
63
Why a $20$ digit number starting with eleven $1$'s cannot be a perfect square?
Jun 26, 2017
answer
63
False proof that $ρe^{iθ} = ρ$ and so complex numbers do not exist?
Dec 27, 2017
answer
55
What is an example of a sequence which "thins out" and is finite?
Nov 13, 2019
question
54
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
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11
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60
Don't review a first question by simply downvoting it or voting to close it
24
Should duplicate questions be deleted?
23
Common problem: OP deletes question immediately upon receiving answer
19
Self-deleted answer undeleted by other users
16
Should I 'recuse' myself on reopen votes for questions I voted to close?
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Why was "An Update to our Community and an Apology" deleted?
49
Why were the Allies so much better cryptanalysts?
34
Story of a student who solves an open problem
33
In what way were Renaissance battles like chess matches?
33
What is the context for Napoleon's quote "[the Austrians] did not know the value of five minutes"?

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