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Level of a field and the number of square classes. (English) Zbl 0282.12101

MSC:
12E99 General field theory
11E16 General binary quadratic forms
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References:
[1] Chang, P.L.: On the theory of quadratic forms. Thesis (1973), University of Waterloo, Ontario, Canada
[2] Pfister, A.: Zur Darstellung von –1 als Summe von Quadraten in einem Körper. J. London math. Soc.40, 159–165 (1965) · Zbl 0131.25002 · doi:10.1112/jlms/s1-40.1.159
[3] Pfister, A.: Quadratische Formen in beliebigen Körpern. Inventiones Math.1, 116–132 (1966) · Zbl 0142.27203 · doi:10.1007/BF01389724
[4] Tsuzuku, T.: On a conjecture of Kaplansky on quadratic forms. J. math. Soc. Japan6, 325–331 (1954) · Zbl 0057.04101 · doi:10.2969/jmsj/00630325
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