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Conjugate element (field theory)
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Conjugate element (field theory) : ウィキペディア英語版
Conjugate element (field theory)

In mathematics, in particular field theory, the conjugate elements of an algebraic element α, over a field extension ''L/K'', are the roots of the minimal polynomial ''p''''K'',α(''x'') of α over ''K''.
Conjugate elements are also called ''Galois conjugates'', or simply ''conjugates''. Normally α itself is included in the set of conjugates of α.
==Example==
The cube roots of the number one are:
:\sqrt() = \begin \ \ 1 \\() -\frac+\fraci \\() -\frac-\fraci \end
The latter two roots are conjugate elements in ''L''/''K'' = Q(''i'' )/Q() with minimal polynomial
: \left(x+\frac\right)^2+\frac=x^2+x+1.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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