零;
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。
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。
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