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In mathematics, a function space is a set of functions of a given kind from a set X to a set Y. It is called a space because in many applications it is a topological space (including metric spaces), a vector space, or both. Namely, if Y is a field, functions have inherent vector structure with two operations of pointwise addition and multiplication to a scalar. Topological and metrical structures of function spaces are more diverse.
Function spaces appear in various areas of mathematics:
topological vector spaces within reach of the ideas that would apply to normed spaces of finite dimension.
If y is an element of the function space \mathcal {C}(a,b) of all continuous functions that are defined on a closed interval [a,b], the norm \|y\|_\infty defined on \mathcal {C}(a,b) is the maximum absolute value of y (x) for a ≤ x ≤ b,^{[1]}
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