求极大值时，最好不要用导数的方法，因为它不存在。
If you are looking for the maximum, you better not just look at the derivative because you won't find it that way.
构造并证明了线性无关向量组的一个充分条件，给出了求极大无关组的一个简单可行的新方法。
The article constructed and proved the one sufficient condition of linearly independent vector group, also a new, simple, practical method to find maximum linearly independent vector group.
构造并证明了线性无关向量组的一个充分条件，给出了求极大无关组的一个简单可行的新方法。
The article by several opposite examples illustrated the former method of finding vector groups maximum linearly independent vector group is imperfect, sometimes even lead to wrong results.
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