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Parentheses are often used to offset an intense moment or a weak moment of a sentence. Use parentheses to emphasize or take away from what's going on in a sentence with help from a certified tutor in this free video on punctuation in the English language.
Parentheses (singular, parenthesis) – also called simply brackets, or round brackets, curved brackets, oval brackets, or, colloquially, parens – contain material that could be omitted without destroying or altering the meaning of a sentence. In most writing, overuse of parentheses is usually a sign of a badly structured text. A milder effect may be obtained by using a pair of commas as the delimiter, though if the sentence contains commas for other purposes visual confusion may result.
Parentheses may be used in formal writing to add supplementary information, such as "Sen. John McCain (R., Arizona) spoke at length." They can also indicate shorthand for "either singular or plural" for nouns – e.g., "the claim(s)" – or for "either masculine or feminine" in some languages with grammatical gender.[7]
Parenthetical phrases have been used extensively in informal writing and stream of consciousness literature. Of particular note is the southern American author William Faulkner (see Absalom, Absalom! and the Quentin section of The Sound and the Fury) as well as poet E. E. Cummings. Parentheses have historically been used where the dash is currently used – that is, in order to depict alternatives, such as "parenthesis)(parentheses". Examples of this usage can be seen in editions of Fowler's.
Parentheses may also be nested (generally with one set (such as this) inside another set). This is not commonly used in formal writing (though sometimes other brackets [especially square brackets] will be used for one or more inner set of parentheses [in other words, secondary {or even tertiary} phrases can be found within the main parenthetical sentence]).[8]
Any punctuation inside parentheses or other brackets is independent of the rest of the text: "Mrs. Pennyfarthing (What? Yes, that was her name!) was my landlady." In this usage the explanatory text in the parentheses is a parenthesis. (Parenthesized text is usually short and within a single sentence. Where several sentences of supplemental material are used in parentheses the final full stop would be within the parentheses. Again, the parenthesis implies that the meaning and flow of the text is supplemental to the rest of the text and the whole would be unchanged were the parenthesized sentences removed.)
Parentheses in mathematics signify a different precedence of operators. Normally, 2 + 3 × 4 would be 14, since the multiplication is done before the addition. On the other hand (2 + 3) × 4 is 20, because the parentheses override normal precedence, causing the addition to be done first. Some authors follow the convention in mathematical equations that, when parentheses have one level of nesting, the inner pair are parentheses and the outer pair are square brackets. Example:
[(2+3)\times4]^2=400
A related convention is that when parentheses have two levels of nesting, braces are the outermost pair.
Parentheses are also used to set apart the arguments in mathematical functions. For example, f(x) is the function f applied to the variable x. In coordinate systems parentheses are used to denote a set of coordinates; so in the Cartesian coordinate system (4, 7) may represent the point located at 4 on the x-axis and 7 on the y-axis. Parentheses may also represent intervals; (0,5), for example, is the interval between 0 and 5, not including 0 or 5.
Parentheses may also be used to represent a binomial coefficient, and in chemistry to denote a polyatomic ion.
In Chinese and Japanese, 【 】, a combination of brackets and parentheses called 方頭括號 and sumitsuki, are used for inference in Chinese and used in titles and headings in Japanese.
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