A square sign pattern matrix that does not have a zero row or zero column is sign potentially orthogonal ( SPO) if every pair of rows and every pair of columns allow orthogonality.
一个没有零行或零列的n阶符号模式矩阵是符号蕴含正交的,若每一对行和列向量都是蕴含正交的。
The clumsy Roman numerals were ousted by the Arabic figures we use to this day, and the zero sign was first employed.
形状笨拙的罗马数字被我们一直沿用至今的阿拉伯数字所替代,并且第一次使用了零的符号。
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