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Euclidean field : ウィキペディア英語版 | Euclidean field
In mathematics, a Euclidean field is an ordered field ''K'' for which every non-negative element is a square: that is, ''x'' ≥ 0 in ''K'' implies that ''x'' = ''y''2 for some ''y'' in ''K''. ==Properties==
* Every Euclidean field is an ordered Pythagorean field, but the converse is not true.〔Martin (1998) p. 89〕 * If ''E''/''F'' is a finite extension, and ''E'' is Euclidean, then so is ''F''. This "going-down theorem" is a consequence of the Diller–Dress theorem.〔Lam (2005) p.270〕
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