(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

a. How do I write vectors bold within displaymath and frac. I want Phi, r and r_1 bold. But get G M_1 bold as well = bad.

b. How do I use arrows instead of the bold notation?

3. The attempt at a solution

\begin{displaymath}

a1. textbf{\Phi(r)} = -\frac{G M_1}{| textbf{r}-textbf{r_1} |}

\end{displaymath}

a2. \bf{\Phi}(\bf{r}) = -\frac{G M_1}{| \bf{r}-\bf{r_1} |}

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# Latex vector notation.

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