Big floor symbols
You could use \left...\right
for stretchable delimiters, or perhaps one of the pairs of the \bigl...\bigr
family of commands:
\documentclass{article}
\usepackage{amsmath}
\begin{document}
\[
\Bigl\lfloor\dfrac{1}{2}\Bigr\rfloor\qquad
\left\lfloor\dfrac{1}{2}\right\rfloor
\]
\end{document}
A LaTeX-y way to handle this issue would be to define a macro called, say, \floor
, using the \DeclarePairedDelimiter
device of the mathtools
package. With such a setup, you can pass an optional explicit sizing instruction -- \Big
and \bigg
in the example code below -- or you can use the "starred" version of the macro -- \floor*
-- to autosize the left and right hand brackets. Both possibilities are pursued in the following code.
\documentclass{article}
\usepackage{mathtools} % for "\DeclarePairedDelimiter" macro
\DeclarePairedDelimiter{\floor}{\lfloor}{\rfloor}
\begin{document}
\[
\floor[\Big]{\frac{1}{2}}
\qquad
\floor[\bigg]{\frac{1}{2}}
\qquad
\floor*{\frac{1}{2}} % autosize vertical dim. of brackets
\]
\end{document}