The Book of Squares, (Liber Quadratorum) in the original Latin is a book on algebra by Leonardo Fibonacci, published in 1225. Fibonacci's identity, establishing that the set of all sums of two squares is closed under multiplication, appears in it. The book anticipated the works of later mathematicians like Fermat and Euler. The book examines several topics in number theory, among them an inductive method for finding Pythagorean triples based on the sequence of odd integers, and on the fact that the sum of the first members of this sequence is .
Famous quotes containing the words book and/or squares:
“To me a book is a message from the gods to mankind; or, if not, should never be published at all.... A message from the gods should be delivered at once. It is damnably blasphemous to talk about the autumn season and so on. How dare the author or publisher demand a price for doing his duty, the highest and most honourable to which a man can be called?”
—Aleister Crowley (1875–1947)
“An afternoon of nurses and rumours;
The provinces of his body revolted,
The squares of his mind were empty,
Silence invaded the suburbs,”
—W.H. (Wystan Hugh)