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https://math.stackexchange.com/questions/1890372/smooth-functions-with-compact-support-and-bounded-derivatives-of-low-order
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http://texas.math.ttu.edu/~gilliam/f06/m5340_f06/mollifiers_approx.pdf
Mollifiers and Approximation by Smooth Functions with Compact Support Let ρ∈ C∞(Rn) be a non-negative function with support in the unit ball in Rn.In particular we assume that ρ(x) ≥ 0 for x∈ Rn, ρ(x) = 0 for kxk >1, and Z Rn ρ(x)dx= 1.
https://www.encyclopediaofmath.org/index.php/Function_of_compact_support
The support of is the closure of the set of points for which is different from zero . Thus one can also say that a function of compact support in is a function defined on such that its support is a closed bounded set located at a distance from the boundary of by a number greater than , …
https://en.wikipedia.org/wiki/Bump_function
It is clear from the construction that this function has compact support, since a function of the real line has compact support if and only if it has bounded and closed support. The proof of smoothness follows along the same lines as for the related function discussed in the Non-analytic smooth function article.
https://en.wikipedia.org/wiki/Smooth_function
Smooth functions with given closed support are used in the construction of smooth partitions of unity (see partition of unity and topology glossary); these are essential in the study of smooth manifolds, for example to show that Riemannian metrics can be defined globally starting from their local existence.
http://www.mat.ucm.es/~marjim/papers/ADJ5.pdf
smooth function between Banach spaces. Theorem 2.1. Let X and Y be separable Banach spaces, where X is infinite-dimensional. Then, there is a uniformly Gˆateaux smooth Lipschitz function b : X−→ Y with bounded support so that b(X) contains the unit ball of …
https://math.rice.edu/~semmes/fun5.pdf
Some basic aspects of smooth functions and distributions on open subsets of Rn are briefly discussed. Contents 1 Smooth functions 2 2 Supremum seminorms 3 3 Countably many seminorms 4 4 Cauchy sequences 5 5 Compact support 6 6 Inductive limits 8 7 Distributions 9 8 Differentiation of distributions 10 9 Multiplication by smooth functions 11
https://en.wikipedia.org/wiki/Function_space
In mathematics, a function space is a set of functions between two fixed sets. Often, the domain and/or codomain will have additional structure which is inherited by the function space. For example, the set of functions from any set X into a vector space has a natural vector space structure given by pointwise addition and scalar multiplication. In other scenarios, the function space might ...
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