# Américo Tavares

Queluz, Portugal

problemasteoremas.wordpress.com

Age: 64

Portuguese retired electrical engineer. Math blog: Problemas e Teoremas.

I see this [math.SE] site mainly as an opportunity to help other users clarifying their mathematical doubts, and being helped by others in my own doubts, in an exchanging process. Normally, as a non mathematician and a non native English speaker, I only answer low-level questions. By reading questions and answers at the adequate level I improve my knowledge of Mathematics and English. I've done and will do this, as long as I get some pleasure from it. -- My answer to Martin Sleziak's question What is the purpose of this site?.

Top Questions

## What does closed form solution usually mean?

asked Nov 6 '10 at 20:09

## How to prove $\cos \frac{2\pi }{5}=\frac{-1+\sqrt{5}}{4}$?

asked Oct 24 '10 at 16:57

## Generalizing $\sum \limits_{n=1}^{\infty }n^{2}/x^{n}$ to $\sum \limits_{n=1}^{\infty }n^{p}/x^{n}$

asked Sep 8 '10 at 23:31

## How to draw these (closed contours) diagrams using TikZ or PSTricks?

asked Oct 18 '12 at 11:34