2
\begin{equation}
f_s = \frac{1}{T} \geq  2 f_m_a_x
\end{equation}

I am getting double subscript error. Although I am getting correct format of equation in pdf but in code it is giving this error. can anybody help me in solving that. Thank You

  • 1
    Do you want to have max as one word ? use f_{max} – albert Nov 8 '18 at 10:12
3

I think you are looking for something like this:

\documentclass{article}
\begin{document}
\begin{equation}
  f_s = \frac{1}{T} \geq  2 f_{\mathrm{max}}
\end{equation}
\end{document}

output

  • Why \mathit? The most common usage is \mathrm. And braces should be added around the subscript; it works without them, but by chance. – egreg Nov 8 '18 at 10:48
  • @egreg, I just used italic version because the OP said the PDF looked like what was wanted. I should add the braces though. – David Purton Nov 8 '18 at 10:58
  • 2
    It's very possible that the model document has the wrong, but unfortunately very common f_{max}. Textual subscripts should always be upright. – egreg Nov 8 '18 at 11:01
  • @egreg, fair enough. I'll change it! – David Purton Nov 8 '18 at 11:17

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