I know that the second derivative measures how much the derivative is changing. For a function (,) : If ″()<0, then the derivative is getting smaller (so the graph of is concave down); if ″()>0, then the derivative is growing, making the graph of concave up. But what does this mean: >0 I want to a answer to explain the meaning of the two variables partial derivatives. You can explain it in the method of mathematical economics.
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