What Does "x|x" Mean In Math?

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Skip to content Home › What Does “x|x” Mean in Math? By Staff WriterLast Updated May 20, 2025 Follow Us: Facebook Twitter

In math, “x|x” means “x, such that x” in set builder notation. It is used when building lists of numbers and defining domains when graphing.

The term “x|x” is put between curly brackets that begin and end a set. The first x stands for all possible numbers in a set; the second is followed by a qualifier that narrows the set, such as “less than” or “greater than” a certain amount. For example, the set of all x such that x is less than 5 can be written as {x|x

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