矩阵谱半径

设A是n × n矩阵，λ₁, ..., λ_n是其特征值，则A的谱半径ρ(A)定义如下：

即矩阵A的谱半径等于矩阵A的特征值绝对值的最大值。

In mathematics, the spectral radius of a square matrix or a bounded linear operator is the supremum among the absolute values of the elements in its spectrum, which is sometimes denoted by ρ(·).