In mathematics, value commonly refers to the output of a function. In the most basic case, that of unary, single-valued functions, there is one input (the argument) and one output (the value of the function).
- Example: If the function is defined by prescribing that for each real number , then the input 3 will yield the function value 10 (since indeed 2 · 32 – 3 · 3 + 1 = 10).
The function of the example is real-valued, since each and every possible function value is real. On the other hand, it is not injective, since different inputs may yield the same value; e.g., , too.
In some contexts, for convenience, functions may be considered to have several arguments and/or several values; also cf. the discussion in the article function. However, strictly seen, this is not an extension, since such functions may be considered as having single families and/or sets as input or output.
Value is also used in other senses, e.g., to specify a certain instance of a variable.
- Example: for two separate values of , namely, for and for .
 See also
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