Why do most mathematics literature use 2L for the period of a function? • Physics Forums

matqkks · 2015-03-09T20:09:56+00:00

[FONT=Helvetica Neue]Why do most mathematics literature use 2L for the period of a function? Is it related to heat equation with a rod of length L?

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 Why do most mathematics literature use 2L for the period of a function?

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

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