Math 2.0

Concept

b□b

Summary

Sometimes used as a synonym of (□)(\square) and [□][\square] for avoiding nested parentheses.

Set-builder notation for a singleton set: {x}\{x\} denotes the set that has xx as a single element.

Further reading

  1. Wikipedia, page 73634, revision 1376316324, Glossary of mathematical symbols, section Brackets > Braces. adopted
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Changed4 November 2026

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