High Quality Content by WIKIPEDIA articles! In mathematical analysis, a modulus of continuity is a function omega:[0,infty]to[0,infty] used to measure quantitatively the uniform continuity of functions. So, a function f:ItoR admits ? as a modulus of continuity if and only if |f(x)-f(y)|leqomega(|x-y|), for all x and y in the domain of f. Since moduli of continuity are required to be infinitesimal at 0, a function turns out to be uniformly continuous if and only if it admits a modulus of continuity. Moreover, relevance to the notion is given by the fact that sets of functions sharing the same modulus of continuity are exactly equicontinuous families. For instance, the modulus ?(t): = kt describes the k-Lipschitz functions, the moduli ?(t): = kt? describe the Holder continuity, the modulus omega(t):=kt,(log(1/t)+1) describe the almost Lipschitz class, and so on. In general, the role of ? is to fix some explicit functional dependence of ? from ? in the (?,?) definition of uniform continuity.

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