symbols
I want to use the \rightarrow without the \mathit command. Here is what I want to write:
[ID, List of symbols] \rightarrow Sequence of rules but when I write it using \mathit command all the spaces are collapsed.
(\mathit{[ID, List of symbols] \rightarrow Sequence of rules }\)
How do I correct this?
You use \mapsto to denote the actual function mapping. For example, consider the function $f:\mathbb N\to\mathbb N$ given by $f(n)=5n$. You could write that second part as $n\mapsto5n$.
Using \scalerel, one can make one argument match the vertical extent of another argument. The optional argument is a max-width constraint (in this case, I chose 2ex). Here's an example of the same code working on two different \somethinghuge arguments. In this case, I chose \mysymbol as a / sign.
\documentclass{article}
\usepackage{scalerel}
\def\mysymbol{/}
\begin{document}
\def\somethinghuge{\rule[-2.2ex]{2ex}{6ex}}
$\left( \somethinghuge \scalerel*[2ex]{\mysymbol}{\somethinghuge} b \right)$
\def\somethinghuge{\rule[-3.2ex]{2ex}{8ex}}
$\left( \somethinghuge \scalerel*[2ex]{\mysymbol}{\somethinghuge} b \right)$
\end{document}
Here's an equivalent syntax that would allow you to avoid typing \somethinghuge twice.
$\left( \scaleleftright[2ex]{.}{\somethinghuge}{\mysymbol} b \right)$
Best Answer
Make the text parts of your formula text instead of maths
$\hbox{[ID, List of symbols]} \rightarrow \hbox{Sequence of rules}$or if you prefer "proper" LaTeX and you have the amsmath package loaded to give you the
\textcommand\(\text{[ID, List of symbols]} \rightarrow \text{Sequence of rules}\)