# Notation for vector time derivatives [closed]

So I am self-studying mechanics using Marion and, as many books, it uses the notation of the dot over the function to express a time derivative, as in $$x = x(t)$$ $$\dot{x}= \frac{dx}{dt}(t)$$

The book also uses the bold notation for vectors, like for example the position vector is: $$\textbf{r} = \textbf{r}(t)$$

Putting these together, we get that using this notation the velocity vector is:

$$\textbf{v} (t) = \dot{\textbf{r}} (t)$$

My question is: when it comes to handwriting, which is the most common/ standard notation? Is it something like: $$\dot{\vec{r}}$$? Or do you stop specifying it as a vector with the arrow on top?

• I've removed a number of comments that were attempting to answer the question and/or responses to them. Please keep in mind that comments should be used for suggesting improvements and requesting clarification on the question, not for answering. – David Z May 18 at 18:32