Martin EricksonMartin Erickson is Professor of Mathematics at Truman State University. He received his PhD at University of Michigan in 1987. He has authored three mathematics textbooks: Introduction to Number Theory (with Anthony Vazzana; Chapman & Hall), Introducion to Combinatorics (Wiley), and Principles of Mathematical Problem Solving (with Joe Flowers; Prentice-Hall). He is a member of the American Mathematical Society and the Mathematical Association of America. Read More Read Less