Waldeck Schtzer is a professor of mathematics at the Universidade Federal de So Carlos - UFSCar since 1996. The goal of this channel is to show mathematical expositions, explanations, examples and applications, in and out of the academic context, in the hopes that people will find it useful or at least interesting.This channel is a personal endeavour, not for profit, neither supported or associated in any way with UFSCar, and its content is the result of the author's individual efforts.