去世
发表于 2025-3-28 15:11:11
Examples of Metric Spaces,Let ., or .[., .], denote the set of all real-valued continuous functions . on the interval[., .], and define.It is easy to verify that ϱ is a metric in .; in particular, the triangle inequality follows from the fact that.for all . in [., .]. Convergence in this metric means uniform convergence on [., .]. For this reason, ϱ is called the ..
付出
发表于 2025-3-28 20:33:52
The Theorem of Alexandroff,Any subset of a metric space is itself a metric space, with the same distance function. It is obvious that any closed subset of a complete metric space is complete with respect to the same metric.
Malaise
发表于 2025-3-29 01:53:53
The Kuratowski-Ulam Theorem,Fubini’s theorem has a category analogue. In its general formulation, this theorem was proved in 1932 by Kuratowski and Ulam .
尖
发表于 2025-3-29 06:40:37
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怎样才咆哮
发表于 2025-3-29 09:59:55
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无底
发表于 2025-3-29 14:57:34
Transforming Linear Sets into Nullsets,t .(.) is a nullset. In fact, letting . = . − . it suffices to take.This is a strictly increasing continuous map of . onto itself. The intervals that compose . are mapped onto a sequence of intervals of total length 1. Hence .(.) is a nullset.
intolerance
发表于 2025-3-29 18:53:17
Transitive Transformations,jects whose existence was already known. Liouville numbers, nowhere differentiable continuous functions, Brouwer’s transformation of the square, were known before the category method was applied. It may therefore be of interest to consider one problem whose solution was first obtained by the category method.
Expressly
发表于 2025-3-29 23:42:02
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arboretum
发表于 2025-3-30 02:19:00
Springer-Verlag New York 1971
poliosis
发表于 2025-3-30 04:30:55
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