Expectation Symbol in LaTeX

After looking for a builtin expectation symbol in LaTeX, and coming up with none, I’ve defined one. Just add:

% Expectation symbol
\DeclareMathOperator*{\E}{\mathbb{E}}

to your LaTeX preamble and you’re done. You’ll also need to add \usepackage{amsmath} or in LyX to tick “Use AMS math package” under Document->Settings->Math Options.

Using the starred version of \DeclareMathOperator makes sure subscripts goes beneath the symbol in display mode.

One thought on “Expectation Symbol in LaTeX

  1. Shane

    Thanks for the tip. You need to import \usepackage{amssymb} in order for this to work.

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