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If I do

The equation is \Delta I/I= k = constant,

I get

Missing $ inserted. $ l.26 The equation is \Delta

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up vote 3 down vote accepted

enter image description here

\documentclass[border=12pt,preview]{standalone}
\usepackage{amsmath}
\begin{document}
This is the delta symbol in question $\Delta$.
\end{document}
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