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  2. Helly's selection theorem - Wikipedia

    en.wikipedia.org/wiki/Helly's_selection_theorem

    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].

  3. Discontinuities of monotone functions - Wikipedia

    en.wikipedia.org/wiki/Discontinuities_of...

    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.

  4. Classification of discontinuities - Wikipedia

    en.wikipedia.org/wiki/Classification_of...

    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 = = +.

  5. Locally profinite group - Wikipedia

    en.wikipedia.org/wiki/Locally_profinite_group

    Let be a unimodular locally profinite group such that / is at most countable for all open compact subgroups K, and a left Haar measure on . Let C c ∞ ( G ) {\displaystyle C_{c}^{\infty }(G)} denote the space of locally constant functions on G {\displaystyle G} with compact support.

  6. List of forcing notions - Wikipedia

    en.wikipedia.org/wiki/List_of_forcing_notions

    In Cohen forcing (named after Paul Cohen) P is the set of functions from a finite subset of ω 2 × ω to {0,1} and p < q if p ⊇ q. This poset satisfies the countable chain condition. Forcing with this poset adds ω 2 distinct reals to the model; this was the poset used by Cohen in his original proof of the independence of the continuum ...

  7. Radon measure - Wikipedia

    en.wikipedia.org/wiki/Radon_measure

    The measure which equals 1 on any Borel set that contains an uncountable closed subset of [1, Ω), and 0 otherwise, is Borel but not Radon, as the one-point set {Ω} has measure zero but any open neighbourhood of it has measure 1. [6] Let X be the interval [0, 1) equipped with the topology generated by the collection of half open intervals {[a ...

  8. Discrete measure - Wikipedia

    en.wikipedia.org/wiki/Discrete_measure

    The Dirac measure of any set containing 0 is 1, and the measure of any set not containing 0 is 0. In mathematics, more precisely in measure theory, a measure on the real line is called a discrete measure (in respect to the Lebesgue measure) if it is concentrated on an at most countable set. The support need not be a discrete set. Geometrically ...

  9. Galvanic series - Wikipedia

    en.wikipedia.org/wiki/Galvanic_series

    The galvanic series (or electropotential series) determines the nobility of metals and semi-metals.When two metals are submerged in an electrolyte, while also electrically connected by some external conductor, the less noble (base) will experience galvanic corrosion.

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