INTRODUCTION TO QUADRATIC FORMS OVER FIELDS (Graduate Studies in Mathematics 67) By T. Y. L AM : 550 pp., US$79.00, ISBN 0-8218-1095-2 (American Mathematical Society, Providence, RI, 2005)

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Convergence of the Motivic Adams Spectral Sequence (2011, background): “Referring to [11], if the field F has a real ordering (which is equivalent to 1 not being a sum of squares), then there exists an epimorphism W ! Z;”