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| Failure of Leibniz law|| in probability, where <math>\Pr(X=x)</math> is abbreviated <math>\Pr(x)</math>. Then if we take something like <math>x:=3</math>, we would have <math>\Pr(3)</math>, but now we have lost the information about what random variable we are talking about.

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| Omission of index || Writing things like <math>\sum_i f(x_i)</math> (unclear what set the index ranges over, or the order in which the terms are added, which can sometimes [[wikipedia:Riemann series theorem|matter]]) or even just <math>\sum f(x_i)</math> (unclear which variable is the index).

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