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Add the vertical bar qualifier explanation

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The vertical bar qualifier explanation is missing, but it's widely used interchangeably with the colon qualifier. Even it the text you use "|" so it should be explained as well.
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Stanislaw Baranski 2023-02-23 19:27:00 +01:00 committed by GitHub
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set-theory.html.markdown
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@ -17,7 +17,7 @@ Set theory is a branch of mathematics that studies sets, their operations, and t
* the cross operator, `×`, means "the Cartesian product of".
### Qualifiers
* the colon qualifier, `:`, means "such that";
* the colon, `:`, or the vertical bar `|` qualifiers are interchangeable and mean "such that";
* the membership qualifier, `∈`, means "belongs to";
* the subset qualifier, `⊆`, means "is a subset of";
* the proper subset qualifier, `⊂`, means "is a subset of but is not equal to".