A Determinantal Inequality for Positive Definite Matrices

A Determinantal Inequality for Positive Definite Matrices
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DOI:
10.4153/cmb-1961-010-9
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发表时间:
1961-01
期刊:
Canadian Mathematical Bulletin
影响因子:
--
通讯作者:
R. Thompson
R. Thompson
中科院分区:
其他
文献类型:
--
作者:
R. Thompson

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设H = (Hi, j)(1≦i, j≦n)是一个复系数的k × k矩阵,其中每个Hi, j本身是一个k × k矩阵(n, k≧2)。令|H|表示H的行列式,令∥H∥= |(|H i, j|)|(1≦i, j≦n)。本笔记的目的是证明以下定理。定理。如果H是正定厄米,则|H|≦∥H∥。并且,|H| =∥H∥当且仅当Hi,当i≠j时j = 0,此定理的情形n = 2包含在[1]中。
Let H = (Hi, j) (1 ≦ i, j ≦ n) be an nk × nk matrix with complex coefficients, where each Hi, j is itself a k × k matrix (n, k ≧ 2). Let |H| denote the determinant of H and let ∥H∥ = |(|H i, j|)| (1 ≦ i, j ≦ n ). The purpose of this note is to prove the following theorem. Theorem. If H is positive definite Hermitian then |H| ≦∥H∥. Moreover, |H| = ∥H∥ if and only if Hi, j = 0 whenever i ≠ j. The case n = 2 of this theorem is contained in [1].