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A reduced theory of quadratic forms. (English) Zbl 0385.12008
Proc. Conf. quadratic Forms, Kingston 1976, Queen’s Pap. pure appl. Math. 46, 569-579 (1977).

12D15 Fields related with sums of squares (formally real fields, Pythagorean fields, etc.)
11E10 Forms over real fields
13K05 Witt vectors and related rings (MSC2000)
15A63 Quadratic and bilinear forms, inner products
12J15 Ordered fields