Sheldon Axler is a Professor in the Mathematics Department at San Francisco State University.
Sheldon Axler. Pré-Cálculo: Uma Preparação Para o Cálculo (Precalculus: A Prelude to Calculus,, second edition, translation into Portuguese), Livros Técnicos e Cientificos Editora, 2016.
Sheldon Axler. (Linear Algebra Done Right, third edition, translation into Chinese), Posts & Telecom Press, 2016.
axler@sfsu.edu
http://www.axler.net