semiset

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Semiset — In set theory, a semiset is a proper class which is contained in a set.The theory of semisets was proposed and developed by Czech mathematicians Petr Vopěnka and Petr Hájek. It is based on a modification of the von Neumann Bernays Gödel set… … Wikipedia
Alternative set theory — Generically, an alternative set theory is an alternative mathematical approach to the concept of set. It is a proposed alternative to the standard set theory. Some of the alternative set theories are: *the theory of semisets; *rough set theory;… … Wikipedia
List of mathematics articles (S) — NOTOC S S duality S matrix S plane S transform S unit S.O.S. Mathematics SA subgroup Saccheri quadrilateral Sacks spiral Sacred geometry Saddle node bifurcation Saddle point Saddle surface Sadleirian Professor of Pure Mathematics Safe prime Safe… … Wikipedia
List of set theory topics — Logic portal Set theory portal … Wikipedia
Petr Hájek — (* 6 February 1940, Prague) is a Czech scientist in the area of mathematical logic [http://www.radio.cz/cz/clanek/91701 Český rozhlas in Czech] and a professor of mathematics. He worked in the Department of Computer Science at the Academy of… … Wikipedia

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