2

We can write

$\not{a}$ 

$\slashed{a}$ 

under

\usepackage{amsmath}

for the following symbol:

enter image description here

enter image description here

What if I have a larger equation like:

$
\int a b c d e f g dx
$

How do we write a bigger \not for it? And bigger \slashed?

enter image description here

$
\not{\int a b c d e f g dx}
$
  • In addition to my answer, I would add that \not a is not proper usage. The \not macro expects to work on an object of category \mathrel, such as \not=. For use with other categories, you should wrap them in a \mathrel, such as \not\mathrel{B}, or more precisely, A\mathord{\not\mathrel{B}}C. – Steven B. Segletes Apr 14 '17 at 18:26
1

Perhaps you are looking for the cancel package.

\documentclass{article}
\usepackage{cancel}
\begin{document}
$
\cancel{\int a b c d e f g dx}
$
\end{document}

enter image description here

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