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## Main Question or Discussion Point

How to number formulas and how to refer to formulas in

**PhysicsForums**?- Thread starter Ad VanderVen
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How to number formulas and how to refer to formulas in **PhysicsForums**?

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Thanks a lot for your quick reply.

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Ibix

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F&=&ma

\end{eqnarray}$$But as far as I know, if someone quotes me the quote will have equation 2. So it's not great...

- #5

Ibix

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Let's test that claim.

F&=&ma

\end{eqnarray}$$But as far as I know, if someone quotes me the quote will have equation 2. So it's not great...

- #6

BvU

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$$\begin{equation} a=b \\ c = d \end {equation}$$ twice I get:

$$\begin{equation} a=b \\ c = d \end {equation}$$

$$\begin{equation} a=b \\ c = d \end {equation}$$

However, MathJax or latex itself does the numbering per page, so after a few previews, post #4 had the number ##(9)## and post #5 had the number ##(9)##

$$\begin{equation} a=b \\ c = d \\ e=f \end {equation}$$

$$\begin{equation} a=b \\ c = d \\ e=f \end {equation}$$

and twice previewing thispost, this one is at ##(19)## whereas you might see ##(13)## !?

- #7

Ibix

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I'd recommend against using the capability - even in the OP, since quotations from it will have different numbers.

- #8

BvU

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@mfb : move to ##LaTeX## forum ?

And perhaps ask the Latexhelp author (who is it ?) to expand on the problem in 'multiple lines' where the \begin { } ... \end{...} environment is mentioned.

Wasn't there a way to restart the automatic numbering ?

seems that \setcounter{equation}{1} is ##\mbox{AMS}\TeX## (##\AMSTeX ##?), not ##\LaTeX##.

In the mean time I found here that \def is admissible, but I didn't find a way to load a set of \def comfortably ... (Phrases I use often but only once per post )

and it doesn't like BB code - understandably

(thinking of \def\PFg{PF guidelines} )

- #9

jim mcnamara

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- #10

fresh_42

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I use a script (AutoHotkey) which allows me to define my own shortcuts, so I can put long words on a single key. In cases like

e.g. in order to typePhrases I use often

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