Material Implication: True Premise, False Result • Physics Forums

Evgeny.Makarov · 2014-02-16T19:51:28+00:00

I'll be linking to this post when the question arises why an implication with a false premise is true.

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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MHB Material Implication: True Premise, False Result

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

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