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As this example shows, when like terms exist in an expression, they may be combined by adding or subtracting (whatever the expression indicates) the coefficients, and maintaining the common factor of both terms. Such combination is called combining like terms, and it is an important tool used for solving equations.
In particular, terms appear as components of a formula. A first-order term is recursively constructed from constant symbols, variables, and function symbols. An expression formed by applying a predicate symbol to an appropriate number of terms is called an atomic formula, which evaluates to true or false in bivalent logics, given an interpretation.
For example, in the expression 3(x+y) the parentheses are symbols of grouping, but in the expression (3, 5) the parentheses may indicate an open interval. The most common symbols of grouping are the parentheses and the square brackets, and the latter are usually used to avoid too many repeated parentheses.
The most common combining characters in the Latin script are the combining diacritical marks (including combining accents). Unicode also contains many precomposed characters , so that in many cases it is possible to use both combining diacritics and precomposed characters, at the user's or application's choice.
This list gives those most commonly encountered with Latin script. For a far more comprehensive list of symbols and signs, see List of Unicode characters. For other languages and symbol sets (especially in mathematics and science), see below
For synonym lists, either use templates like {{Species list}} which automatically use small text for authorities, or wrap the authority information as described above.) Derived uses in non-biological contexts are not italicized: The largest carnivore in family Tyrannosauridae was T. rex itself, but Unicorn was an album by the band T. Rex.
In general, parentheses must be used to indicate the order of evaluation if a non-associative operation appears more than once in an expression (unless the notation specifies the order in another way, like /).
The {} template and its variants support all ISO 639 language codes, correctly identifying the language and automatically italicizing for you. Please use these templates rather than just manually italicizing non-English material. (See WP:Manual of Style/Accessibility § Other languages for more information.)