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robousy · 2005-10-21T18:58:38+00:00

is this the right section to post contour integral questions?

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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Get Expert Help with Contour Integrals | Post Questions Here"

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

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