+1886 \( \left(\nabla^2+n^2(x)\,k^2\right){\{ {E\atop B}\} }=0\)
+1886 Just testing how to write a number over a number without a fraction line in LaTeX, and I doubt that question can be solved.
+118667 Mmm
I worked this our from here
http://www.sascha-frank.com/Faq/matrices.html
\text{This text } \begin{smallmatrix}
2\\ 3\\
\end{smallmatrix} \;\;\text{is only for showing.}
\(\text{This text } \begin{smallmatrix} 2\\ 3\\ \end{smallmatrix} \;\;\text{is only for showing.} \)
