Normally, most people use the symbol $\Box$ to represent the d'Alembert (wave) operator (including the linked to Wikipedia page).
Recently I wanted to use \hat\Box
and \tilde\Box
, but they do not render very well.
What is the "best" way to create such symbols?
Aside: The above image is rendered using my local install of pdflatex: pdfTeX 3.1415926-1.40.10-2.2 (TeX Live 2009/Debian)
. The symbols seem to render fine on some online services: e.g. "Online LaTeX Equation Editor" produces
from
\begin{align*}
\Box &= \sum_a \partial^a\partial_a \,, &
\hat\Box &= \sum_a \mathcal{D}^a\mathcal{D}_a
\end{align*}
\nabla
and\Delta
. These symbols have heavier line width than\box
which makes the latter look odd..\nabla
or\Delta
much, but I see your point. Maybe it's worth its own question?