%%% This file is part of PlanetPhysics snapshot of 2011-09-01
%%% Primary Title: trace
%%% Primary Category Code: 02.10.Yn
%%% Filename: Trace.tex
%%% Version: 1
%%% Owner: bloftin
%%% Author(s): bloftin
%%% PlanetPhysics is released under the GNU Free Documentation License.
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\begin{document}
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\begin{definition}
The trace of a \htmladdnormallink{matrix}{http://planetphysics.us/encyclopedia/Matrix.html} $tr(M)$ is the sum of its diagonal elements.
\end{definition}
\end{document}
