Is it possible to perform supremum with two parameters in the same function?

St41n · 2013-06-17T14:45:08+00:00

Can I do this: sup_(x,y) f(x,y) = sup_y sup_x f(x,y) ?

Thread 'How does time derivative commute from one variable to another?'

I'm reviewing Meirovitch's "Methods of Analytical Dynamics," and I don't understand the commutation of the derivative from r to dr: $$ \mathbf{F} \cdot d\mathbf{r} = m \ddot{\mathbf{r}} \cdot d\mathbf{r} = m\mathbf{\dot{r}} \cdot d\mathbf{\dot{r}} $$

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Thread 'How does time derivative commute from one variable to another?'

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