Greg Michaelson 
Introduction to Functional Programming Through Lambda Calculus [EPUB ebook] 

Functional programming is rooted in lambda calculus, which constitutes the world’s smallest programming language. This well-respected text offers an accessible introduction to functional programming concepts and techniques for students of mathematics and computer science. The treatment is as nontechnical as possible, and it assumes no prior knowledge of mathematics or functional programming. Cogent examples illuminate the central ideas, and numerous exercises appear throughout the text, offering reinforcement of key concepts. All problems feature complete solutions.