Commit 9e1ac05b authored by Michael Kohlhase's avatar Michael Kohlhase

approxeq

parent c0d6eabd
......@@ -6,7 +6,7 @@
\begin{example}[for=finite-difference-method]
The example illustrates discretization of the \trefii[laplace-operator]{Laplace}{operator} on a regular \trefi[grid]{grid} as a centered approximation:
\[
\approxeq{
\approxequal{
\laplacian[nb]{\nappa{u}{\bar{x}}},
\Sumfromto{i}{1}{D}{
\realtimes{\frac{1}{\livar{h}i ^2}, \realplus{\realminus{\nappa{u}{\realminus{\bar{x}, \livar{h}i}},\realtimes{2,\nappa{u}{\bar{x}}}}, \nappa{u}{\realplus{\bar{x}, \livar{h}i}}}}
......
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