矩阵列向量组的任意极大无关组所含的向量个数等于它的梯矩阵所有主列的向量数？ 向量个数是指什么？ 向量组中极大线性无关组如何找？是如何定义的？
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a1 a2 a3 a4
1 0 1 0
0 1 1 0
0 0 0 1
0 0 0 0
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主列，就是只含1个1，其余行为0的列向量
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