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https://math.stackexchange.com/questions/242877/compact-support-functions-dense-in-l-1
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https://www.planetmath.org/CompactlySupportedContinuousFunctionsAreDenseInLp
Since this kind of simple functions are dense in L p (X) we see that C c (X) is also dense in L p (X). Title compactly supported continuous functions are dense in L p
https://mathproblems123.files.wordpress.com/2011/02/density-1.pdf
Oct 03, 2004 · Density of Continuous Functions in L1 October 3, 2004 1 Approximation by continuous functions In this supplement, we’ll show that continuous functions with compact support are dense in L1 = L1(Rn;m). The support of a complex valued function f on a metric space X …
http://www.math.nthu.edu.tw/~kchen/teaching/5131week3.pdf
dense in Lp(E). These step functions are linear combinations of characteristic functions on some dyadic cubes. This implies that the space of simple functions is also dense in Lp(Rn). In this section we prove that the space of smooth functions with compact supports, and the space of functions with rapidly decreasing derivatives are also dense in L(Rn).
http://www.math.ucsd.edu/~bdriver/231-02-03/Lecture_Notes/Chapter%2011-%20Convolutions%20and%20Approximations.pdf
such that µ(K) <∞when Kis a compact subset of X.Then Cc(X) (the space of continuous functions with compact support) is dense in L p (µ) for all p∈[1,∞). Proof.
http://www.math.ucsd.edu/~bdriver/240A-C-03-04/Lecture_Notes/Older-Versions/chap22.pdf
Cc(X,C)=C(X,C) is dense in Lp(µ) for all p∈[1,∞).Since, by the domi- nated convergence theorem, uniform convergence implies Lp(µ) — convergence, it follows from the Weierstrass approximation theorem (see Theorem 8.34 and Corollary 8.36 or Theorem 12.31 and Corollary 12.32) that polynomials are also dense in Lp(µ).
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 , where is sufficiently small.
https://mathoverflow.net/questions/267710/continuous-functions-dense-in-l-1
If X is a complete doubling metric space equipped with a complete probability measure μ such that all Borel sets are μ -measurable, then Cc(X) --- the continuous functions with compact support --- are dense in L1(μ). Question: What are the weakest conditions under which Cc(X) is dense in L1(μ)...
https://math.la.asu.edu/~lanchier/files/lec202.pdf
est dense dans C([0;1];R) pour la norme kkL2 si et seulement si la s erie de terme g en erale 1 n diverge. [4], Sect. 4.6 Th eor eme 1.6 Soit un ouvert de RN. Alors l’espace C1 c des fonctions C1 a support compact est dense dans Lp() pour 1 p<1. [1], Sect. 4.4 2 Deux crit eres de densit e : les th eor emes de Hahn-Banach et de Baire.
https://en.wikipedia.org/wiki/Locally_integrable_function
In mathematics, a locally integrable function (sometimes also called locally summable function) is a function which is integrable (so its integral is finite) on every compact subset of its domain of definition.The importance of such functions lies in the fact that their function space is similar to L p spaces, but its members are not required to satisfy any growth restriction on their behavior ...
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