LaTeX.org

Excellent, thank you. Ended up getting it, and it didn't look too dissimilar, though I like the way you've laid it out for clarity.

Thanks - still a newbie, teaching myself as I go along... no doubt it'll get a lot easier with more practice.

Hmm, looks like \textsubscript was both a longwinded and a plain bad way of doing it!

This worked:

Gauss' law for electricity can be stated as $\nabla$$\cdot$E = {$\rho_{f}$/$\varepsilon$ where E = electric field strength (Vm\textsuperscript{-1}), $\rho_{f}$ = electric charge density (Cm ...

Error message line breaks as follows:

Typing this sentence as part of my Masters literature review in physics:

Gauss' law for electricity can be stated as $\nabla$$\cdot$E = $\rho$\textsubscript{f}/$\varepsilon$ where E = electric field strength (Vm\textsuperscript{-1}), $\rho$\textsubscript{f} = electric charge density (Cm ...