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?.