[texhax] \mid Description

P. R. Stanley prstanley at ntlworld.com
Tue Nov 10 21:52:34 CET 2009


Hi folks
What does the \mid macro do in the below line, that's to say, what 
visual effect does it, well, effect?
\[(a_1 \to P_1 \mid \ldots \mid a_n \to P_n) \]

Thanks,
Paul



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