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José Carlos Santos
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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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  • Porto, Portugal
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Top posts (8,370) All Questions Answers | Votes Newest

115 Why not include as a requirement that all functions must be continuous to be differentiable? Jun 19 '18
87 Unexpected examples of natural logarithm Jul 3 '17
80 Can a binary operation have an identity element when it is not associative and commutative? Jun 20 '17
78 Does an increasing sequence of reals converge if the difference of consecutive terms approaches zero? Feb 17
67 Unsolved Problems (Not Independent of ZFC) due to Lack of Computational Power Aug 16
56 False proof that $ρe^{iθ} = ρ$ and so complex numbers do not exist? Dec 27 '17
56 Why a $20$ digit number starting with eleven $1$'s cannot be a perfect square? Jun 26 '17
47 How many times do you have to use L'Hôpital's rule? Nov 10 '17
46 How are the known digits of $\pi$ guaranteed? Nov 13 '18
45 Can we use symmetry rules in improper integrals? Jul 16 '18
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