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Some local-global principles for formally real fields. (English) Zbl 0332.12101


MSC:

12D15 Fields related with sums of squares (formally real fields, Pythagorean fields, etc.)
11E04 Quadratic forms over general fields
11E81 Algebraic theory of quadratic forms; Witt groups and rings

Citations:

Zbl 0199.55501
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