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Semiorderings and Witt rings
Published online by Cambridge University Press: 17 April 2009
Extract
For a pythagorean field F with semiordering Q and associated preordering T, it is shown that the Witt ring WT (F) is isomorphic to the Witt ring W (K) whre K is a closure of F with respect to Q. For an arbitrary preordering T, it is shown how the covering number of T relates to the construction of WT (F).
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- Copyright © Australian Mathematical Society 2003
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