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Topic: Uniformly continuous functions


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In the News (Wed 15 Feb 12)

  
  Uniform continuity - Wikipedia, the free encyclopedia
In mathematical analysis, a function f(x) is called uniformly continuous if, roughly speaking, small changes in the input x effect small changes in the output f(x) ("continuity"), and furthermore the size of the changes in f(x) depends only on the size of the changes in x but not on x itself ("uniformity").
Continuity itself is a local property of a function—that is, a function f is continuous, or not, at a particular point, and when we speak of a function being continuous on an interval, we mean only that it is continuous at each point of the interval.
A function either is uniformly continuous on an entire interval or is not; it may be continuous at each point of an interval without being uniformly continuous on the entire interval.
en.wikipedia.org /wiki/Uniform_continuity   (478 words)

  
 PlanetMath: uniformly continuous   (Site not responding. Last check: 2007-10-29)
Every uniformly continuous function is also continuous, while the converse does not always hold.
Uniformly continuous functions have the property that they map Cauchy sequences to Cauchy sequences and that they preserve uniform convergence of sequences of functions.
This is version 11 of uniformly continuous, born on 2002-06-07, modified 2006-09-21.
planetmath.org /encyclopedia/UniformlyContinuous.html   (217 words)

  
 PlanetMath: the limit of a uniformly convergent sequence of continuous functions is continuous
PlanetMath: the limit of a uniformly convergent sequence of continuous functions is continuous
"the limit of a uniformly convergent sequence of continuous functions is continuous" is owned by neapol1s.
This is version 1 of the limit of a uniformly convergent sequence of continuous functions is continuous, born on 2005-06-25.
planetmath.org /encyclopedia/LimitOfAUniformlyConvergentSequenceOfContinuousFunctionsIsContinuous.html   (90 words)

  
 6.2. Continuous Functions
Continuous functions are precisely those groups of functions that preserve limits, as the next proposition indicates:
Continuous functions can be added, multiplied, divided, and composed with one another and yield again continuous functions.
Continuity is defined at a single point, and the epsilon and delta appearing in the definition may be different from one point of continuity to another one.
www.shu.edu /projects/reals/cont/contin.html   (734 words)

  
 Springer Online Reference Works
A necessary and sufficient condition for uniform convergence that does not use the limit function is given by the Cauchy criterion for uniform convergence.
Uniform convergence of a sequence of continuous functions is not a necessary condition for continuity of the limit function.
Necessary, and simultaneously sufficient, conditions for the continuity of the limit of a sequence of continuous functions in general are given in terms of quasi-uniform convergence of the sequence.
eom.springer.de /u/u095230.htm   (365 words)

  
 Functions with distant fibers and uniform continuity by Alessandro Berarducci, Dikran Dikranjan and Jan Pelant   (Site not responding. Last check: 2007-10-29)
Functions with distant fibers and uniform continuity by Alessandro Berarducci, Dikran Dikranjan and Jan Pelant
The uniformly approachable functions introduced in [DP] are defined by a property stronger than continuity and weaker than uniform continuity, which is preserved under composition.
the functions with many uniformly continuous truncations coincide with the functions with distant connected components of fibers.
at.yorku.ca /i/d/e/b/34.htm   (339 words)

  
 Uniform Continuity   (Site not responding. Last check: 2007-10-29)
A function f is uniformly continuous, or uniform, throughout a region r if one δ fits all.
In other words, δ is a function of ε, but does not depend on the point p in the domain.
Thus the compositionn of continuous functions is continuous.
www.mathreference.com /top-ms,unif.html   (201 words)

  
 PlanetMath: uniformly continuous on $\mathbb{R}$ is roughly linear
PlanetMath: uniformly continuous on $\mathbb{R}$ is roughly linear
Theorem 1   Uniformly continuous functions defined on
This is version 19 of uniformly continuous on
planetmath.org /encyclopedia/SomethingRelatedToUniformlyContinuous.html   (71 words)

  
 471DiscontinuousFunctions.nb
Since f(0+) = f(0-) = 1, this function is continuous at x = 0.
Note that f is continuous at x = 0, even though you need to "pick up your pencil" arbitrarily close to the origin in order to draw the graph.
Each of these functions is continuous at all x - values except at x = 0.
www.bsu.edu /web/mkarls/DiscontinuousFunctions   (500 words)

  
 function concept
This again brings the concept of a function into the construction of a curve, for Descartes is thinking in terms of the magnitude of an algebraic expression taking an infinity of values as a magnitude from which the algebraic expression is composed takes an infinity of values.
Thus began the long controversy about the nature of functions to be allowed in the initial conditions and in the integrals of partial differential equations, which continued to appear in an ever increasing number in the theory of elasticity, hydrodynamics, aerodynamics, and differential geometry.
Weierstrass's function contradicted an intuitive feeling held by most of his contemporaries to the effect that continuous functions were differentiable except at "special points".
www-groups.dcs.st-and.ac.uk /~history/HistTopics/Functions.html   (3049 words)

  
 lbc.htm
He shows how the increasing function theorem (a function with positive derivative is increasing) serves very nicely in place of the mean value theorem, and sketches a proof of it from the nested interval property of the real number system.
On closed finite intervals, uniform continuity and differentiability are as easy to verify, and using them as starting points permits a natural development of the calculus in which such difficulties do not arise.
A composition of uniformly continuous functions is uniformly continuous.
www.math.neu.edu /~bridger/LBC/lbc.htm   (1326 words)

  
 Mathematics Other Homework Help
Uniform Continuity - Prove (or disprove) the following statement: A function f exists that is uniformly continuous on (a,oo) and for which lim as x-> oo of f(x) = oo (infinity symbol).
Proof of Uniform Continuity - (See attached file for full problem description and equations) --- Show that the function is uniformly continuous on.
Real Analysis--Uniformly Continuous Functions - Determine whether or not each of the following functions is uniformly continuous on the given set D. Give reasons to your answers.
www.brainmass.com /homeworkhelp/math/other/35500   (301 words)

  
 MATH 451 FINAL EXAM INFORMATION   (Site not responding. Last check: 2007-10-29)
Theorem that the uniform limit of a sequence of continuous functions is continuous.
Theorem that a uniformly Cauchy sequence of functions is guaranteed to converge uniformly to a function.
Theorem about the existence of a max and min for a real valued function which is continuous on a closed and bounded set (interval).
www.math.wvu.edu /~sherm/m451/final.remarks.html   (426 words)

  
 Mathematics Colloquium
The pros and cons of the Slater vs. Gaussian functions will be presented in the context of their compactness, accuracy, and state of the art.
Many of the integrals are small in magnitude because the functions are localized to a small region of space, hence relationships such as Schwartz or triangle inequalities are very useful in obtaining upper bounds.
In such problems, the functional being minimized is often non convex, due to this competition between energy and entropy.
www.math.uab.edu /seminar/colloquium.html   (1916 words)

  
 Information about the final exam in mathematics 328   (Site not responding. Last check: 2007-10-29)
Prove that a continuous function defined on a compact set is necessarily uniformly continuous.
Prove that the limit of a uniformly converging sequence of continuous funtions is continuous.
(x) converge pointwise and are differentiable on a certain interval, and if their derivatives converge uniformly on that interval, then the limit function f(x) is differentiable on the interval, and the derivative of f is the limit of the derivatives of the functions in the sequence.
www.mast.queensu.ca /~leo/essays.html   (644 words)

  
 Cauchy.html
It is also the case that Cauchy sequences are not preserved under mapping by continuous functions.
There is an important sub-class of continuous functions which do preserve Cauchy sequences and, in fact, are the continous functions on an important sub-Category of Complete Metric Spaces.
To verify that complete metric spaces and uniformly continuous maps form a category we need to check the the composition of uniformly continuous maps is uniformly continuous.
www.umsl.edu /~siegel/SetTheoryandTopology/Cauchy.html   (236 words)

  
 Category theory - definition of Category theory - Labor Law Talk Dictionary (via CobWeb/3.1 planetlab2.tamu.edu)   (Site not responding. Last check: 2007-10-29)
Then it becomes possible to relate different categories by functors, generalizations of functions which associate to every object of one category an object of another category and to every morphism in the first category a morphism in the second.
Categorical logic is now a well-defined field based on type theory for intuitionistic logics, with application to the theory of functional programming and domain theory, all in a setting of a cartesian closed category as non-syntactic description of a lambda calculus.
In the following, unless stated otherwise, whenever the morphisms are functions, the composition of morphisms is given by the usual set-theoretic composition of functions.
encyclopedia.laborlawtalk.com.cob-web.org:8888 /Category_theory   (2400 words)

  
 [No title]
The family of open subsets $aV,a\in A$ is left uniformly discrete in $G$ by virtue of the choice of $V$.
As a corollary, the function $$\varphi(x)=\sum_{a\in A}f_a(x)\colon G\to\R$$ is well-defined and is left uniformly continuous.
Since $A$ is a left uniformly discrete subset, it is left neutral by the hypothesis.
www.cs.biu.ac.il /~megereli/Aust.tex   (1488 words)

  
 Abstract Harmonic Analysis Research Group
We are also interested in the dual of some C*-algebras of functions (such as the algebra LUC(G) of bounded left uniformly continuous functions on G or the space WAP(G) of the weakly almost periodic functions on G) with an Arens product.
With βG, one can consider characteristic functions on some subsets when the group G is discrete, but this requires lots of combinatorial skills.
It is interesting to note that both classes, wap fuctions and distal functions, are related to the theory of ergodicity.
cc.oulu.fi /~harmonic/research.html   (562 words)

  
 Springer Online Reference Works
The class of functions of vanishing mean oscillation on
-closure of the continuous functions that vanish at infinity.
The Hilbert transform of a bounded, uniformly continuous function on
eom.springer.de /V/v110050.htm   (126 words)

  
 AMCA: Generation of the uniformly continuous functions by Francisco Montalvo   (Site not responding. Last check: 2007-10-29)
Let X be a non-empty set and F be a vector lattice of real-valued functions on X containing all the constant functions.
In addition, we give an internal condition on F which is necessary and sufficient for F to be uniformly dense in U(X).
The author(s) of this document and the organizers of the conference have granted their consent to include this abstract in Atlas Mathematical Conference Abstracts.
at.yorku.ca /c/a/f/w/56.htm   (213 words)

  
 Heneri Dzinotyiweyi - Mathematicians of the African Diaspora   (Site not responding. Last check: 2007-10-29)
Uniformly continuous and weakly almost periodic functions on some topological semigroups, Proc.
Uniformly continuous functions on some topological semigroups, Quart.
Almost convergent and weakly almost periodic functions on a semigroup, Trans.
www.math.buffalo.edu /mad/PEEPS/dzinotyiweyi_heneri.html   (197 words)

  
 Mathematics Other Homework Help
Determine whether the following functions are uniformly continuous on the indicated intervals.
Proving that f is not uniformly continuous - I need help with writing proofs for the two functions below.
Uniform Convergence - (See attached file for full problem description and equations) --- Prove: Let be a sequence of continuous functions convergent uniformly on a bounded closed interval [a,b] and let.
www.brainmass.com /homeworkhelp/math/other/31010   (212 words)

  
 mathproject >> Continuity (via CobWeb/3.1 planetlab2.tamu.edu)   (Site not responding. Last check: 2007-10-29)
We will focus here on those functions whose value at a single point is influenced by the function's behaviour in the neighbourhood of that point, providing the function with a 'continuous' character.
This kind of interaction is no feature of the original notion of a function, so we expect new properties for these functions.
As we need to examine the function's behaviour in an arbitrary neighbourhood of a fixed piont, we will employ convergent sequences for this study.
www.mathproject.de.cob-web.org:8888 /StetigeFunktionen/continuity.htm   (121 words)

  
 UNT Department of Mathematics: Graduate Seminar
However, in 1984, Hata and Yamaguti showed the close relationship between the Takagi function and Lebesgue's singular function, a monotone increasing continuous function whose derivative is zero almost everywhere.
Georganopoulos has sown that a continuous function f: X \rightarrow B, where X is a compact metric space and B a convex subset of a real normed space Y, is a uniform limit of Lipschitz maps from X to B. This result is obtained using a Lipschitz partition of unity.
Namely, our first application of LIP-partition of unity states that a bounded continuous function f:X \rightarrow B where X is a metric space and B is a convex subset of the real normed space Y, can be approximated, in the uniform norm, by LIP function.
www.math.unt.edu /seminars/grad.shtml   (3438 words)

  
 Banach: Messages from 2000
A real-valued function on $K$ is said to be of Baire class one (Baire-$1$) if it is the pointwise limit of a sequence of continuous functions.
This is an announcement for the paper "Inequalities for the Gamma function and estimates for the volume of sections of $B_p^n$" by Jesus Bastero, Fernando Galve, Ana Pena, and Miguel Romance.
Furthermore, an arbitrary finite uniformly bounded orthonormal set of N functions contains a subset of "logarithmic" density equivalent in distribution to the corresponding set of Rademacher functions, with a constant independent of N. A connection between the tail distribution and the L_p-norms of polynomials with respect to systems of random variables exploited.
www.math.okstate.edu /~alspach/banach/2000mes.html   (12920 words)

  
 Matches for:   (Site not responding. Last check: 2007-10-29)
The main theme of the book is the study of uniformly continuous and Lipschitz functions between Banach spaces (e.g., differentiability, stability, approximation, existence of extensions, fixed points, etc.).
Oscillation of uniformly continuous functions on unit spheres of finite-dimensional subspaces
Oscillation of uniformly continuous functions on unit spheres of infinite-dimensional subspaces
www.mathaware.org /bookstore?fn=20&arg1=collseries&item=COLL-48   (322 words)

  
 Uniform Calculus   (Site not responding. Last check: 2007-10-29)
Uniform continuity of a one variable function f is a condition on its variation, f(y) - f(x).
A proof of pointwise continuity could hardly be simpler.
 A uniformly continuous function f on a finite interval I is bounded.
avalon.math.neu.edu /~bridger/lbc1a/node2.html   (220 words)

  
 Functions With Distant Fibers and Uniform Continuity (ResearchIndex)   (Site not responding. Last check: 2007-10-29)
Functions With Distant Fibers and Uniform Continuity (1999)
Abstract: The uniformly approachable functions introduced in [DP] are defined by a property stronger than continuity and weaker than uniform continuity, which is preserved under composition.
1 Sets on which measurable functions are determined by their r..
citeseer.ist.psu.edu /408669.html   (517 words)

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