Derbyshire, John Unknown quantity: a real and imaginary history of algebra/ John Derbyshire. - Washington, DC: Joseph Henry Press, c2006. - viii, 374 p., [8] p. of plates: ill., ports.; 24 cm. Includes bibliographical references and index. ISBN: 030909657X (hardback : alk. paper) Standard No.: 9780309096577 LCCN: 2005037018 Subjects--Topical Terms: Algebra--History.Equations--History.Algebra, Universal--History.Algebra, Abstract--History.Geometry, Algebraic--History. Dewey Class. No.: 510.9 / D428u