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In mathematics, the Peano–Jordan measure (also known as the Jordan content) is an extension of the notion of size (length, area, volume) to shapes more complicated than, for example, a triangle, disk, or parallelepiped. It turns out that for a set to have Jordan measure it should be well-behaved in a certain
Peano was motivated by Georg Cantor's earlier counterintuitive result that the infinite number of points in a unit interval is the same cardinality as the infinite number of points in any finite-dimensional manifold, such as the unit square. The problem Peano solved was whether such a mapping could be continuous; i.e., a curve that fills a space.
Pages in category "Measures (measure theory)" The following 73 pages are in this category, out of 73 total. ... Peano–Jordan measure; Perfect measure; Polar ...
Osgood curves are simple plane curves with positive Lebesgue measure [7] (it can be obtained by small variation of the Peano curve construction). The dragon curve is another unusual example. Any line in R n {\displaystyle \mathbb {R} ^{n}} , for n ≥ 2 {\displaystyle n\geq 2} , has a zero Lebesgue measure.
Peano's curve is a surjective, continuous function from the unit interval onto the unit square, however it is not injective. Peano was motivated by an earlier result of Georg Cantor that these two sets have the same cardinality. Because of this example, some authors use the phrase "Peano curve" to refer more generally to any space-filling curve ...
Pieri was a member of a group of Italian geometers and logicians that Peano had gathered around himself in Turin. This group of assistants, junior colleagues and others were dedicated to carrying out Peano's logico–geometrical program of putting the foundations of geometry on firm axiomatic footing based on Peano's logical symbolism.
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Giuseppe Peano (/ p i ˈ ɑː n oʊ /; [1] Italian: [dʒuˈzɛppe peˈaːno]; 27 August 1858 – 20 April 1932) was an Italian mathematician and glottologist. The author of over 200 books and papers, he was a founder of mathematical logic and set theory , to which he contributed much notation .