How do you guys write your vectors?

[eurekameh]

In introductory physics and lower-level engineering courses, my professors would write their vectors with arrowheads on top. Now, I'm starting to see them being underlined a lot more. Why is this? Personally, I still like the arrowheads on top convention, but I can start underlining them if it would be beneficial in the long run.

 

[FeynmanIsCool]

Well, in texts it is usually bold such as "vector R" but I don't think there is a "correct" way. I've seen over line, over arrow, under line, Bold, and left side lines (connected to letter)Most professors use over the top arrow since its easiest to denote (much easier then trying to make a letter bold!) But Richard Feynman is his "Lectures on Physics" explained all the many ways to denote, and ended it with "You can invent your own!" (pg 22 Vol II)

 

[jhae2.718]

By hand, arbitrary vectors with underbar, unit vectors underbar with hat, e.g.
$$\ddot{\underline r} = \left(\ddot{r} - r\dot{\theta}^2\right) \hat{\underline e}_r + \left(r\ddot{\theta} + 2\dot{r}\dot{\theta}\right)\hat{\underline e}_\theta$$

Using $\LaTeX$, bold italic (\usepackage{bm} and \renewcommand{\vec}[1]{\bm{#1}}), e.g.
$$\ddot{\boldsymbol r} = \left(\ddot{r} - r\dot{\theta}^2\right) \hat{\boldsymbol e}_r + \left(r\ddot{\theta} + 2\dot{r}\dot{\theta}\right)\hat{\boldsymbol e}_\theta$$