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Minkowski's bound : ウィキペディア英語版
Minkowski's bound
In algebraic number theory, Minkowski's bound gives an upper bound of the norm of ideals to be checked in order to determine the class number of a number field ''K''. It is named for the mathematician Hermann Minkowski.
==Definition==
Let ''D'' be the discriminant of the field, ''n'' be the degree of ''K'' over \mathbb, and 2 r_2 = n - r_1 be the number of complex embeddings where r_1 is the number of real embeddings. Then every class in the ideal class group of ''K'' contains an integral ideal of norm not exceeding Minkowski's bound
: M_K = \sqrt \left(\frac\right)^ \frac \ .
Minkowski's constant for the field ''K'' is this bound ''M''''K''.〔Pohst & Zassenhaus (1989) p.384〕

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