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Pointless topology (also called point-free or pointfree topology) is an approach to topology that avoids mentioning points. The name 'pointless topology' is due to John von Neumann . [ 9 ] The ideas of pointless topology are closely related to mereotopologies , in which regions (sets) are treated as foundational without explicit reference to ...
Kelley's 1955 text, General Topology, which eventually appeared in three editions and several translations, is a classic and widely cited graduate-level introduction to topology. An appendix sets out a new approach to axiomatic set theory, now called Morse–Kelley set theory, that builds on Von Neumann–Bernays–Gödel set theory.
In April 2007, a rumour was confirmed on the Swedish talk show Bert that The Pirate Bay had received financial support from right-wing entrepreneur Carl Lundström. This caused some consternation since Lundström, an heir to the Wasabröd fortune, is known for financing several far-right political parties and movements like Sverigedemokraterna and Bevara Sverige Svenskt (Keep Sweden Swedish).
In mathematics, general topology or point set topology is that branch of topology which studies properties of general topological spaces (which may not have further structure; for example, they may not be manifolds), and structures defined on them.
His research, comprising over 200 published papers, covers various subfields of general topology. He has done particularly important work in metrizability theory and generalized metric spaces , cardinal functions , topological function spaces and other topological groups , and special classes of topological maps.
Continuum (topology) Extended real number line; Long line (topology) Sierpinski space; Cantor set, Cantor space, Cantor cube; Space-filling curve; Topologist's sine curve; Uniform norm; Weak topology; Strong topology; Hilbert cube; Lower limit topology; Sorgenfrey plane; Real tree; Compact-open topology; Zariski topology; Kuratowski closure ...
Some sites focus on certain content – such as etree that focuses on live concerts – and some have no particular focus, like The Pirate Bay. Some sites specialize as search engines of other BitTorrent sites.
Ákos Császár (Hungarian: Császár Ákos, Hungarian pronunciation:) (26 February 1924 – 14 December 2017) was a Hungarian mathematician, specializing in general topology and real analysis. He discovered the Császár polyhedron, a nonconvex polyhedron without diagonals. [1]