Steven G. (Washington University, St. Louis, Missouri, USA) Krantz 
Dictionary of Algebra, Arithmetic, and Trigonometry [PDF ebook] 

Clear, rigorous definitions of mathematical terms are crucial to good scientific and technical writing-and to understanding the writings of others. Scientists, engineers, mathematicians, economists, technical writers, computer programmers, along with teachers, professors, and students, all have the need for comprehensible, working definitions of ma