List of problems in mathematical notation

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This page gives a list of problems in mathematical notation. The list focuses on problems with the symbolism of mathematics rather than other communication problems/conventions (such as using "if" to mean "iff" in definitions, not introducing variables, etc.).

Name Description How to avoid
Overloading/abuse of notation This happens when the same symbol is used for different purposes. For instance, parentheses are used to group expressions, for writing tuples, for function calls, in superscripts or subscripts with various meanings (f^{(i)} for the ith derivative or the ith function in some sequence), and so forth. The equals sign is often used for equality both in the object language and the metalanguage in mathematical logic, and used as part of the expression X=x to define an event in probability.
Type error
Failure of Leibniz law
Omission of index