I haven't found a thread for latex tests, but I'm sure there's at least one of them. So feel free to move this post.(adsbygoogle = window.adsbygoogle || []).push({});

##\begin{array} \Phi (a, \theta ) = \sum _{l=0}^ \infty [A_l a^l + B_l a^{-(l+1)}] P_l (\cos \theta ) = V_a \\ \Phi (b, \theta ) = \sum _{l=0}^ \infty [A_l b^l + B_l b^{-(l+1)}] P_l (\cos \theta ) =V_b \end{array}##

I don't understand why the first lines does not read "Phi(a, theta)". I wrote \Phi (a, \theta ).

Anyone has an idea? It works for the second line.

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# Latex test

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