Mathematics
José Carlos Santos's user avatar
José Carlos Santos's user avatar
José Carlos Santos's user avatar
José Carlos Santos
  • Member for 5 years, 8 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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All Questions Answers
Score Newest
answer
176
Why not include as a requirement that all functions must be continuous to be differentiable?
Jun 19, 2018
question
123
Unexpected examples of natural logarithm
Jul 3, 2017
answer
92
How can a "proper" function have a vertical slope?
Oct 5, 2019
answer
88
Does an increasing sequence of reals converge if the difference of consecutive terms approaches zero?
Feb 17, 2019
answer
85
Can a binary operation have an identity element when it is not associative and commutative?
Jun 20, 2017
answer
80
Unsolved Problems due to Lack of Computational Power
Aug 16, 2019
answer
65
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
question
57
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
answer
54
What is an example of a sequence which "thins out" and is finite?
Nov 13, 2019
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64
Don't review a first question by simply downvoting it or voting to close it
25
Should duplicate questions be deleted?
23
Common problem: OP deletes question immediately upon receiving answer
17
Tag management 2020
16
Should I 'recuse' myself on reopen votes for questions I voted to close?
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175
Why was "An Update to our Community and an Apology" deleted?
49
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"?
33
In what way were Renaissance battles like chess matches?

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