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==Probability theory==
{{Unreferenced section|date=March 2021}}
* [[Random variable]]s are usually written in [[upper case]] roman letters: ''X'', ''Y'', etc.
* Particular realizations of a random variable are written in corresponding [[lower case]] letters. For example, ''x''<sub>1</sub>, ''x''<sub>2</sub>, …, ''x''<sub>''n''</sub> could be a [[random sample|sample]] corresponding to the random variable ''X''. A cumulative probability is formally written <math>P(X\le x) </math> to differentiate the random variable from its realization.
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