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Américo Tavares's user avatar
Américo Tavares's user avatar
Américo Tavares's user avatar
Américo Tavares
  • Member for 13 years, 7 months
  • Last seen more than 1 year ago
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I am a retired Portuguese electrical engineer. Find out more on my blog, Problemas e Teoremas.

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257
Different ways to prove $\sum_{k=1}^\infty \frac{1}{k^2}=\frac{\pi^2}{6}$ (the Basel problem)
80
What is the Jacobian matrix?
70
Nice proofs of $\zeta(4) = \frac{\pi^4}{90}$?
60
What is the importance of Calculus in today's Mathematics?
52
What is the result of $\infty - \infty$?