$$…$$ should not be used in LaTeX

Just learnt today that the popular command $$…$$ in LaTeX should not be used as it produces wrong spacing and is an obsolete command.

The correct command should be \[ … \].

Both have the same number of characters and thus are just as easy to type, so it is probably a good idea to switch to \[ … \].

See http://tex.stackexchange.com/questions/503/why-is-preferable-to

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