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The principal cube root is the cube root with the largest real part. In the case of negative real numbers, the largest real part is shared by the two nonreal cube roots, and the principal cube root is the one with positive imaginary part. So, for negative real numbers, the real cube root is not the principal cube root. For positive real numbers ...
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The black line is the asymptotic distribution to first order whereas the green line includes the second order term. [ 8 ] Since the sign of the discriminant of a number field K is (−1) r 2 , where r 2 is the number of conjugate pairs of complex embeddings of K into C , the discriminant of a cubic field will be positive precisely when the ...
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More generally, we find that + + + + is the positive real root of the equation x 3 − x − n = 0 for all n > 0. For n = 1 , this root is the plastic ratio ρ , approximately equal to 1.3247. The same procedure also works to get
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In number theory, a kth root of unity modulo n for positive integers k, n ≥ 2, is a root of unity in the ring of integers modulo n; that is, a solution x to the equation (or congruence) (). If k is the smallest such exponent for x, then x is called a primitive kth root of unity modulo n. [1]