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Let be a real-valued monotone function defined on an interval. Then the set of discontinuities of the first kind is at most countable.. One can prove [5] [3] that all points of discontinuity of a monotone real-valued function defined on an interval are jump discontinuities and hence, by our definition, of the first kind.
Let X be a reflexive, separable Hilbert space and let E be a closed, convex subset of X. Let Δ : X → [0, +∞) be positive-definite and homogeneous of degree one. Suppose that z n is a uniformly bounded sequence in BV([0, T]; X) with z n (t) ∈ E for all n ∈ N and t ∈ [0, T].
The function in example 1, a removable discontinuity. Consider the piecewise function = {< = >. The point = is a removable discontinuity.For this kind of discontinuity: The one-sided limit from the negative direction: = and the one-sided limit from the positive direction: + = + at both exist, are finite, and are equal to = = +.
It is named after Carl Johannes Thomae, but has many other names: the popcorn function, the raindrop function, the countable cloud function, the modified Dirichlet function, the ruler function (not to be confused with the integer ruler function), [2] the Riemann function, or the Stars over Babylon (John Horton Conway's name). [3]
You say "Let x 1 < x 2 < x 3 < ⋅⋅⋅ be a countable subset of the compact interval [a, b] ..." as if every countable set of reals can be put in this form. That is not so. Although the rational numbers is countable, it cannot be enumerated in a strictly increasing sequence. JRSpriggs 02:32, 9 February 2022 (UTC)
The graph of the Cantor function on the unit interval. In mathematics, the Cantor function is an example of a function that is continuous, but not absolutely continuous.It is a notorious counterexample in analysis, because it challenges naive intuitions about continuity, derivative, and measure.
The Food and Drug Administration's new rules on "healthy" food labels are voluntary and are scheduled to take effect at the end of February.
From Salas and Hille, Calculus of One and Several Variables, 1982, Section 4.2 "Increasing and Decreasing Functions", Definition 4.2.1, p. 142: "A function f is said to (i) increase on the interval I iff for every two numbers x 1, x 2 in I x 1 < x 2 implies f(x 1) < f(x 2).