Calculus Made Easy

Calculus Made Easy is a book on infinitesimal calculus originally published in 1910 by Silvanus P. Thompson, considered a classic and elegant introduction to the subject. Calculus Made Easy ignores the use of limits with its epsilon-delta definition, replacing it with a method of approximation directly to the correct answer in the infinitesimal spirit of Leibniz, now formally justified in modern non-standard analysis.