How to type a tall / symbol?

Question

Say I want

\documentclass{article}
\begin{document}
\[cl(V, q) =\left (\sum_{r=0}^{\infty} \bigotimes^r V\right)/\{v\otimes v = -q(v,v)\}\]
\end{document}

How to make the "/" symbol longer to cover the height of the first expression?

Answer 1

This way:

\documentclass{article}
\begin{document}
\[
  \mathit{cl}(V, q) =
  \biggl(\sum_{r=0}^{\infty} \bigotimes^r V\biggr)
  \bigg/
  \bigl\{v\otimes v = -q(v,v)\bigr\}
\]
\end{document}

Several comments:

• don't use \left\right around summation and integration symbols, it produces way too large delimiters. (Better don't use them at all.)

• cl seems to be one math item hence it should be placed inside \mathit for a proper spacing. (You can use \mathrm, \mathsf etc. as well.)

• I made the \{\} in the last part a bit larger so that the set doesn't look so humble.

Answer 2

Well you could use flexible brackets

\documentclass{article}

\begin{document}
\[cl(V, q) =\left.\left (\sum_{r=0}^{\infty} \bigotimes^r V\right)\right/ \{ v\otimes v = -q(v,v)\}\]
\end{document}

In any case you could use fixed brackets:

\documentclass{article}

\begin{document}
\[V \big/ \Big/ \bigg/  \Bigg/ \]
\end{document}