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math mode - Getting the expectation symbol to behave like $\sum$ instead of $\Sigma$ - TeX - LaTeX Stack Exchange
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math mode - How to write Mathematical expectation and Probability in the following form - TeX - LaTeX Stack Exchange
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math operators - How to create an expectation symbol that behave similarly to \sum? - TeX - LaTeX Stack Exchange
Probability Densities, Expectation Values, and Uncertainties for Gaussian Wavepackets - Wolfram Demonstrations Project
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