I noticed that the heights of \sqrt{1}
and \sqrt{-1}
are different. For instance, when they are in between \left(
and \right)
parentheses, I must write a character of zero-width (e.g. \sqrt{-1\mathstrut}
).
Why do \sqrt{1}
and \sqrt{-1}
behave so different?
This is an example with a slightly more complicated expression:
\documentclass[]{article}
\begin{document}
$$ \left( 10 + \sqrt{7}\, \right)^{1/3} $$
$$ \left( 10 + \sqrt{-7}\, \right)^{1/3} $$
$$ \left( 10 + \sqrt{+7}\, \right)^{1/3} $$
\end{document}
The following image shows the output of latex
. I obtain similar results with pdflatex
, xelatex
and lualatex
. Notice that \sqrt{+7}
behaves as \sqrt{-7}
, but different from \sqrt{7}
.
latex
,pdflatex
,xelatex
orlualatex
?