If I do
The equation is \Delta I/I= k = constant,
I get
Missing $ inserted.
$
l.26 The equation is \Delta
[Tex/LaTex] how to insert \Delta with normal text
symbols
Related Solutions
Just use Heiko Oberdiek's centernot package:
\documentclass{article}
\usepackage{centernot}
\usepackage{amsmath}
\begin{document}
$a\centernot\ll b \centernot\Delta c$
$a\centernot\longrightarrow b$
$a\centernot{\xrightarrow{1234567}} b$
\end{document}
Note that the document uses Springer's LNCS style. In this style, all Greek letters are in italics, and vectors are denoted by boldface.
Most likely the bold italic Delta is produced in this particular case by something similar to this:
\documentclass{llncs}
\begin{document}
$\vec{\Delta}$
\end{document}
The result is:
Note that if you used the article class, the same code would produce a normal Delta with an arrow:
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