# Changes

## List of problems in mathematical notation

, 04:08, 19 February 2019
no edit summary
| Type error
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| Failure of Leibniz law|| in probability, where $\Pr(X=x)$ is abbreviated $\Pr(x)$. Then if we take something like $x:=3$, we would have $\Pr(3)$, 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 $\sum_i f(x_i)$ (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 $\sum f(x_i)$ (unclear which variable is the index).
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