books.google.com - This study of basic number systems explores natural numbers, integers, rational numbers, real numbers, and complex numbers. Written by a noted expert on logic and set theory, it assumes no background in abstract mathematical thought. Undergraduates and beginning graduate students will find this treatment...https://books.google.com/books/about/Number_Systems_and_the_Foundations_of_An.html?id=3domViIV7HMC&utm_source=gb-gplus-shareNumber Systems and the Foundations of Analysis