20,617 reputation
334105
bio website problemasteoremas.wordpress.c…
location Queluz, Portugal
age 62
visits member for 2 years, 9 months
seen 46 mins ago
stats profile views 5,073

I'm a retired Portuguese electrical engineer.

You can contact me at acltavares[at]sapo[dot]pt

Blog Problemas Teoremas.

profile for Américo Tavares on Stack Exchange, a network of free, community-driven Q&A sites

MathOverflow account


2h
reviewed Approve suggested edit on Regarding a well-known tensor product formula
5h
revised How to prove to be an irrational number? Like $\sqrt{2}$ $\sqrt{3}$ or $\sum\limits_{k=1}^{\infty} \frac{1}{n^2}=\pi^2/6$
added 197 characters in body
7h
reviewed Approve suggested edit on “Translating” one value $- \infty$ to $+ \infty$ to another ($+ \infty$ to $ \gt 0$)
7h
revised How to prove to be an irrational number? Like $\sqrt{2}$ $\sqrt{3}$ or $\sum\limits_{k=1}^{\infty} \frac{1}{n^2}=\pi^2/6$
Added (number-theory) tag
7h
revised Apéry's constant ($\zeta(3)$) value
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7h
revised How to prove to be an irrational number? Like $\sqrt{2}$ $\sqrt{3}$ or $\sum\limits_{k=1}^{\infty} \frac{1}{n^2}=\pi^2/6$
added 19 characters in body
8h
comment How to prove to be an irrational number? Like $\sqrt{2}$ $\sqrt{3}$ or $\sum\limits_{k=1}^{\infty} \frac{1}{n^2}=\pi^2/6$
@Gustavo Bandeira You are welcome.
8h
revised How to prove to be an irrational number? Like $\sqrt{2}$ $\sqrt{3}$ or $\sum\limits_{k=1}^{\infty} \frac{1}{n^2}=\pi^2/6$
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8h
comment How to prove to be an irrational number? Like $\sqrt{2}$ $\sqrt{3}$ or $\sum\limits_{k=1}^{\infty} \frac{1}{n^2}=\pi^2/6$
@GustavoBandeira No! The test above or a similar one provides a method but the difficulty is on how to construct such sequences $(a_n),(b_n)$.
8h
answered How to prove to be an irrational number? Like $\sqrt{2}$ $\sqrt{3}$ or $\sum\limits_{k=1}^{\infty} \frac{1}{n^2}=\pi^2/6$
9h
revised Integral of rational functions.
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9h
revised Using a definite integral, to create a specific recurrence relation.
Corrected spelling typos and added (calculus) and (definite-integral) tag. Removed (abstract-algebra) tag
9h
reviewed Approve suggested edit on Proof that the interior of any union of closed sets with empty interior in a compact Hausdorff space is empty
12h
revised Integral of rational functions.
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13h
reviewed Approve suggested edit on Differentiation - Limits Equal (Possibly MVT, Rolle's or L'Hopital)
13h
revised Integral of rational functions.
Corrected spelling typo
13h
comment Integral of rational functions.
Do you have a typo in 1? How do you complete the square in $\dfrac{1}{x^2+2px+q}$ to get $\dfrac{4}{(4q-4p)^2+(p+x)^2}$?
13h
revised Integral of rational functions.
added 669 characters in body
14h
reviewed Approve suggested edit on Value of series, Partialsum?
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reviewed Approve suggested edit on Diffeomorphism from Inverse function theorem