短語詞組短語reduced triangular idempotent matrix [數(shù)]簡約三角冪等矩陣lower triangular infinite matrix 下三角無窮矩陣triangular idempotent matrix 三角冪等矩陣down triangular Toeplitz matrix 下三角Toeplitz矩陣lower triangular functional matrix 下三角矩陣lower triangular complex matrix 下三角復(fù)矩陣triangular weight matrix 三角權(quán)值矩陣Upper -triangular operator matrix 上三角算子矩陣left upper triangular identity matrix 左上單位三角陣 返回 triangular matrix