High Quality Content by WIKIPEDIA articles! In mathematics, various typographical forms of brackets are frequently used in mathematical notation such as parentheses ( ), square brackets [ ], curly brackets { }, and angle brackets. In the typical use, a mathematical expression is enclosed between an "opening bracket" and a matching "closing bracket". Generally such bracketing denotes some form of grouping: in evaluating an expression containing a bracketed sub-expression, the operators in the sub-expression take precedence over those surrounding it. Additionally, there are several specific uses and meanings for the various brackets. Historically, other notations, such as the vinculum, were similarly used for grouping; in present-day use, these notations have all specific meanings. In the Z formal specification language, curly braces denote a set and angle brackets denote a sequence.

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