Skip to main content
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, 1 month
  • Last seen this week
Profile Activity
Stats
430,355
reputation
6.8m
reached
15,059
answers
28
questions
Communities
View all
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.

Badges
View all badges
300
gold badges
278
silver badges
468
bronze badges
Top tags
View all tags
6,049
Score
2,539
Posts
17
Posts %
4,539
Score
1,758
Posts
12
Posts %
4,315
Score
2,198
Posts
15
Posts %
3,242
Score
1,716
Posts
11
Posts %
3,094
Score
1,244
Posts
8
Posts %
2,943
Score
1,311
Posts
9
Posts %
Top posts
View all questions and answers
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
Top Meta posts
12
24
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
Top network posts
View all network posts
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?