That is a critical point. And we used the second derivative to see that this critical point is a local maximum.
这是一个临界点，考察它的二阶导数,会发现这确实是一个极大值点。
I should say that is for a function of two variables to try to decide whether a given critical point is a minimum, a maximum or a saddle point.
但这种办法并不普遍，只能用于二元函数，来判断是极小值点、极大值点还是鞍点。
And the maximum is at a critical point.
最大值点是临界点。
The minimum and maximum of amplitude fluctuation correspond with the minimum of precession speed after the critical point on the response curve.
振幅、相位、进动角速度在过临界后的波动频率随转速增加而增加。
The minimum and maximum of amplitude fluctuation correspond with the minimum of precession speed after the critical point on the response curve.
振幅、相位、进动角速度在过临界后的波动频率随转速增加而增加。
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