How can I access textbook-style written problems on this forum?

Lawrence Albano · 2004-10-22T20:43:16+00:00

I have been looking over some of the posts and I was wondering how you were able to get textbook written problems on the forum that were pictures. As apposed to (2^3/5) as an example.

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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