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English function words may be spelled with fewer than three letters; e.g., 'I', 'an', 'in', while non-function words usually are spelled with three or more (e.g., 'eye', 'Ann', 'inn'). The following is a list of the kind of words considered to be function words with English examples. They are all uninflected in English unless marked otherwise:
Thomae's function: is a function that is continuous at all irrational numbers and discontinuous at all rational numbers. It is also a modification of Dirichlet function and sometimes called Riemann function. Kronecker delta function: is a function of two variables, usually integers, which is 1 if they are equal, and 0 otherwise.
This following list features abbreviated names of mathematical functions, function-like operators and other mathematical terminology. This list is limited to abbreviations of two or more letters (excluding number sets).
Also called an injection or, sometimes, one-to-one function. In other words, every element of the function's codomain is the image of at most one element of its domain. Surjective function: has a preimage for every element of the codomain, that is, the codomain equals the image. Also called a surjection or onto function.
If the function is called f, this relation is denoted y = f (x) (read f of x), the element x is the argument or input of the function, and y is the value of the function, the output, or the image of x by f. [43] The symbol that is used for representing the input is the variable of the function (one often says that f is a function of the ...
An interrogative word or question word is a function word used to ask a question, such as what, which, when, where, who, whom, whose, why, whether and how. They are sometimes called wh-words , because in English most of them start with wh- (compare Five Ws ).
In linguistics, functional morphemes, also sometimes referred to as functors, [1] are building blocks for language acquisition.A functional morpheme (as opposed to a content morpheme) is a morpheme which simply modifies the meaning of a word, rather than supplying the root meaning.
A prop-word: one, as in "the blue one" A pro-adjective substitutes an adjective or a phrase that functions as an adjective: so as in "It is less so than we had expected." A pro-adverb substitutes an adverb or a phrase that functions as an adverb: how or this way. A pro-verb substitutes a verb or a verb phrase: do, as in: "I will go to the party ...