The Analytic Art (Dover Books on Mathematics)
By Francois Viete, T Richard Witmer
Publisher: Dover Publications Inc. 2009 464 Pages
DJVU 3 MB
This historic work consists of several treatises that developed the first consistent, coherent, and systematic conception of algebraic equations. Originally published in 1591, it pioneered the notion of using symbols of one kind (vowels) for unknowns and of another kind (consonants) for known quantities.