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?
[Tex/LaTex] How to type a tall / symbol
math-modemath-operatorsscalingsymbols
Related Solutions
You want to use \bigoplus instead of \oplus.
I've never seen concatenation done that way. Addition and XOR are commutative operations so it makes sense to sum over a set (or take the exclusive OR of a set). Concatenation is not like that. I think I would explicitly write out the concatenation. That said, you can use \bigparallel from the stmaryrd package.
\documentclass{article}
\usepackage{amsmath}
\usepackage{stmaryrd}
\newcommand*\concat{\mathbin{\|}}
\begin{document}
\[x_1\concat x_2\concat\dotsb\concat x_n\]
\[\bigparallel_{i=1}^n x_i\]
\end{document}
Apart from \mathclap{…}, mathtools provides a command specifically set for these situations: \smashoperator{…}. Which is, more or less, like putting \mathclap{…} in both (sub and super scripts). Taking @tohecz advice about a'|a', your code will be like
\documentclass{article}
\usepackage{mathtools}
\begin{document}
\[
a(i,k) \gets \min\Bigl\{ 0, r(k,k) + \smashoperator{\sum_{i'\notin\{i,k\}}} \max\{0, r(i',k)\} \Bigr\}
\]
\end{document}
Which will be like all the other answers. Moreover, that command has an optional argument: lr, default one, will smash both sides; r only smash the right; and l will smash the left. In the examples I will add some text over the operator so you can see how it works (it smashes both).
Best Answer
This way:
Several comments:
don't use
\left\rightaround summation and integration symbols, it produces way too large delimiters. (Better don't use them at all.)clseems to be one math item hence it should be placed inside\mathitfor a proper spacing. (You can use\mathrm,\mathsfetc. as well.)I made the
\{\}in the last part a bit larger so that the set doesn't look so humble.