Control engineer. Tweet @pait, some in Portuguese, not often math. Interested in Riemannian geometry and partial differential equations as a tool. Trying to solve some old open problems in control theory.
Q&A for people studying math at any level and professionals in related fields
Q&A for professional mathematicians
Q&A for users of Mathematica
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems
Q&A for professional and enthusiast programmers
Q&A for power users of Apple hardware and software