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# Topic: Axiom of power set

 Zermelo-Fraenkel set theory - Open Encyclopedia   (Site not responding. Last check: 2007-11-07) The Zermelo-Fraenkel axioms of set theory (ZF) are the standard axioms of axiomatic set theory on which, together with the axiom of choice, all of ordinary mathematics is based in modern formulations. The axioms are the result of work by Thoralf Skolem in 1922, based on earlier work by Adolf Fraenkel in the same year, which was based on the axiom system put forth by Ernst Zermelo in 1908 (Zermelo set theory). Axiom of union: For any set x, there is a set y such that the elements of y are precisely the elements of the elements of x. open-encyclopedia.com /ZFC   (492 words)

 Power set - Wikipedia, the free encyclopedia Cantor's diagonal argument shows that the power set of a set (infinite or not) always has strictly higher cardinality than the set itself (informally the power set must be 'greater' than the original set). The power set of the set of natural numbers for instance can be put in a one-to-one correspondence with the set of real numbers (by identifying an infinite 0-1 sequence with the set of indices where the ones occur). The power set of a set S forms an Abelian group when considered with the operation of symmetric difference (with the empty set as its unit and each set being its own inverse) and a commutative semigroup when considered with the operation of intersection. en.wikipedia.org /wiki/Power_set   (448 words)

 Zermelo-Fraenkel set theory - Wikipedia, the free encyclopedia The Zermelo-Fraenkel axioms of set theory together with the axiom of choice are the standard axioms of axiomatic set theory. The axioms are the result of work by Thoralf Skolem in 1922, based on earlier work by Abraham Fraenkel in the same year, which was based on the axiom system put forth by Ernst Zermelo in 1908 (Zermelo set theory). Axiom of infinity: There exists a set x such that {} is in x and whenever y is in x, so is y ∪ {y}. en.wikipedia.org /wiki/Zermelo-Fraenkel_set_theory   (538 words)

 Axiomatic set theory   (Site not responding. Last check: 2007-11-07) Set theory is a branch of mathematics created principally by the German mathematician Georg Cantor at the end of the 19th century. Initially controversial, set theory has come to play the role of a foundations of mathematicsfoundational theory/ in modern mathematics, in the sense of a theory invoked to justify assumptions made in mathematics concerning the existence of mathematical objects (such as numbers or functions) and their properties. It is often asserted that axiomatic set theory is thus an adequate foundation for current mathematical practice, in the sense that ''in principle'' all proofs produced by the mathematical community could be written formally in set theory terms. www.infothis.com /find/Axiomatic_set_theory   (2596 words)

 Set Theory Set theory is the branch of mathematics that deals with the properties of well-defined collections of objects. Set A is a proper subset of set B iff all the members of A are also members of B, but not all the members of B are members of A. Notation. Two sets can be put into one-to-one correspondence iff their members can be paired off such that each member of the first set has exactly one counterpart in the second set, and each member of the second set has exactly one counterpart in the first set. www.risberg.ws /Hypertextbooks/Mathematics/Sets/intro.html   (1159 words)

 Axiom of power set   (Site not responding. Last check: 2007-11-07) In mathematics, the axiom of power set is one of the Zermelo-Fraenkel axiom s of axiomatic set theory. To understand this axiom, note that the clause in parentheses in the symbolic statement above simply states that C is a subset of A. We call the set B the power set of A, and denote it P A. www.serebella.com /encyclopedia/article-Axiom_of_power_set.html   (635 words)

 PlanetMath: axiom of power set   (Site not responding. Last check: 2007-11-07) The axiom of power set is an axiom of Zermelo-Fraenkel set theory which postulates that for any set "axiom of power set" is owned by mathcam. This is version 7 of axiom of power set, born on 2003-06-26, modified 2004-11-17. www.planetmath.org /encyclopedia/PowerSet2.html   (103 words)

 Axiom of power set - Wikipedia, the free encyclopedia In mathematics, the axiom of power set is one of the Zermelo-Fraenkel axioms of axiomatic set theory. The axiom of power set is generally considered uncontroversial, and it or an equivalent appears in just about any alternative axiomatisation of set theory. This article incorporates material from Axiom of power set on PlanetMath, which is licensed under the GFDL. en.wikipedia.org /wiki/Axiom_of_power_set   (172 words)

 zfc   (Site not responding. Last check: 2007-11-07) The Zermelo-Fraenkel axioms of set theory (ZF), are the standard axioms of axiomatic set theory on which, together with the axiom of choice, all of ordinary mathematics is based. The axiom system has an infinite number of axioms because an axiom schema is used. An equivalent finite alternative system is given by the von Neumann-Bernays-Gödel axioms (NBG), which distinguish between classes and sets. www.yourencyclopedia.net /ZFC.html   (452 words)

 Axiom of union   (Site not responding. Last check: 2007-11-07) In axiomatic set theory and the branches of logic mathematics and computer science that use it the axiom of union is one of the axioms of Zermelo-Fraenkel set theory stating that for any two sets is a set that contains exactly the of both. Given any set A there is a set B such that given any set C C is a member of B if and only if there is a set D such that D is a member of A and C is a member of D. The axiom of union is generally considered and it or an equivalent appears in about any alternative axiomatization of set theory. www.freeglossary.com /Axiom_of_union   (646 words)

 DISF - Interdisciplinary Encyclopaedia of Religion and Science | Infinity   (Site not responding. Last check: 2007-11-07) However, the Cantorian demonstration, through the antinomy of the “power set” (the set of all subsets of a given set), of the inconsistency and contradictory nature of the “universal set”, or “set of all sets”, is not a sort of accident within the course of the development of his research. As we have seen, the demonstration of the antinomy of the power set was functional for the Neoplatonic notion of and therefore for the notion of transcendence as pure “indescribability”. In fact, if this maximal ordinal set was to exist, its limiting element should belong (as it is the maximal set) and at the same time should not belong (as it is the limiting element) to the ordinal set that it orders. www.disf.org /en/Voci/13.asp   (7090 words)

 Articles - Naive set theory   (Site not responding. Last check: 2007-11-07) Naive set theory was created at the end of the 19th century by Georg Cantor in order to allow mathematicians to work with infinite sets consistently. Two sets A and B are defined to be equal when they have precisely the same elements, that is, if every element of A is an element of B and every element of B is an element of A. This is the set consisting of all objects which are elements of A or of B or of both (see axiom of union). www.gaple.com /articles/Naive_set_theory   (2455 words)

 Set Theory:Axioms - Wikibooks Axiom of Pair: If A and B are sets, then there is a set containing exactly A and B. The following axiom is somewhat of a convention but various models of set theory have been defined without it, or even using axiom stating things close to the opposite. It remains the most controversial axiom among mathematicians, and for that reason, when using ZF with the Axiom of Choice, it is often specified as ZFC. en.wikibooks.org /wiki/Set_Theory:Axioms   (703 words)

 Zermelo-Fraenkel set theory - the free encyclopedia   (Site not responding. Last check: 2007-11-07) The Zermelo-Fraenkel axioms of set theory (ZF) are the standard axioms of theorem about sets which can be proved in one system can be proven in the other. metamathematicians believe that these axioms are consistent (in the sense that no contradiction can be derived from them), this has not been proved. www.world-knowledge-encyclopedia.com /?t=ZFC   (444 words)

 Axiom of Infinity   (Site not responding. Last check: 2007-11-07) The Axiom of Choice This page gives a brief explanation of the Axiom of Choice and links to other related websites. Axiom Photographic Axiom is a photographic library founded in London in 1996, covering Asia, Europe and North America. Consequences of the Axiom of Choice Project Project to keep the book (also named in the title), describing forms related to the Axiom of Choice and their implications, updated. www.serebella.com /encyclopedia/article-Axiom_of_Infinity.html   (400 words)

 [No title]   (Site not responding. Last check: 2007-11-07) Without that axiom, it would be consistent that the power set of any infinite set is a proper class rather than a set. The axiom of infinity entails the existence of a set whose members are precisely the natural numbers. But in ZFC all sets are sets of sets.) And, since U is a set, so is P(U), by the power set axiom. www.math.niu.edu /~rusin/known-math/00_incoming/infinity   (310 words)

 Power set   (Site not responding. Last check: 2007-11-07) In formal language, the existence of power set of any set is presupposed by the axiom of power set. In this case S is usually called the universal set and any subset F of P(S) is called a family of sets over S. The power set of the natural numbers for instance can be put in a one-to-one correspondence with the set of real numbers (by identifying an infinite 0-1 sequence with the set of indices where the ones occur). www.free-download-soft.com /info/visoco.html   (463 words)

 PlanetMath: Zermelo-Fraenkel axioms   (Site not responding. Last check: 2007-11-07) Ernst Zermelo and Abraham Fraenkel proposed the following axioms as a foundation for what is now called Zermelo-Fraenkel set theory, or ZF. If this set of axioms are accepted along with the Axiom of Choice, it is often denoted ZFC. Axiom of power set: If is a set, then there exists a set planetmath.org /encyclopedia/ZermeloFraenkelSetTheory.html   (215 words)

 Zermelo-Fraenkel Set Theory: A Supplement to Set Theory This axiom asserts that when sets x and y have the same members, they are the same set. Since it is provable from this axiom and the previous axiom that there is a unique such set, we may introduce the notation ‘Ø’ to denote it. Then the Axiom of Infinity asserts that there is a set x which contains Ø as a member and which is such that, anytime y is a member of x, then y∪{y} is a member of x. plato.stanford.edu /entries/set-theory/ZF.html   (698 words)

 The Next Three Axioms   (Site not responding. Last check: 2007-11-07) Remember that the power set is the collection of all subsets of a set. If the set r is a relation, restrict to the members with one element, then take the union across these members. Let f be the power set of c and restrict f so that each member of f is a function on all of s. www.mathreference.com /set-zf,ax3.html   (607 words)

 paradoxes of set theory   (Site not responding. Last check: 2007-11-07) the paradoxes of set theory seem to have been back-benched in the latter half of the 20th Century and yet the fact that they are not resolved poses a major epistemological challenge to the foundations of mathematics. Every instance of the axiom of specification specifies a different specification set because otherwise z would be the set of all sets. The axiom of specification fares no better than the axiom of comprehension and we will be proposing that the latter be reinstated bec ause it is a less ad hoc axiom than specification. alex.edfac.usyd.edu.au /chatrooms/Maths/267726716.html   (518 words)

 The axiom of choice and non-enumerable reals   (Site not responding. Last check: 2007-11-07) It is known that there is a denumerable set X of writable functions f such that f defines r e R, where R is the nondenumerable set of reals. The set Z must be construed as an abstract ideal that is analogous to the concept of infinitesimal quantity, which is curious since set theory arose as an answer to the philosophical objection to such entities. The axioms we have discussed guarantee the existence of sets that are explicitly specified in various ways -- for example, as the set of all subsets of some set (Axiom of Power Sets), or as the set of all elements of some set that have a particular property (Axiom of Comprehension). www.angelfire.com /az3/nfold/choice.html   (2033 words)

 Axiomatic Set Theory   (Site not responding. Last check: 2007-11-07) The power set axiom fails to ensure that there is a set whose members are 0, 2 and 3. I had imagined that the power set axiom required the existence of all those sub collections as subsets and furthermore that they be collected together into one set, called the power set. The set of subsets of integers is, in ordinary logic, uncountable. www.cap-lore.com /MathPhys/SetAxioms.html   (694 words)

 Axiom of power set   (Site not responding. Last check: 2007-11-07) In the formal language of the Zermelo-Fraenkel axioms the axiom To understand this axiom note that the in parentheses in the symbolic statement above states that C is a subset of A. Thus what the axiom is really is that given a set A we can find a set B whose members are precisely the subsets A. www.freeglossary.com /Axiom_of_power_set   (307 words)

 Power set axiom The power set axiom is the last axiom of standard set theory. The axiom of the power set completes the axioms of ZF or Zermelo Frankel set theory. From the power set axiom one can conclude that the set of all subsets of the integers exists. www.mtnmath.com /whatth/node38.html   (402 words)

 Zermelo This axiom is not always used -- it seems to have no application to mathematics, but it does make some proofs and definitions easier, e.g., that of an ordinal. The open question of whether one could develop a set theory with a finite number of axioms was answered in the affirmative by J. von Neumann in 1925. Actually he used functions rather than sets as his primitive notion, and the current first-order version is due to the reworking in the late 1930's by (mainly) Bernays as well as Gödel, and called von Neumann-Bernays-Gödel set theory, abbreviated to NBG set theory. www.math.uwaterloo.ca /~snburris/htdocs/scav/zermelo/zermelo.html   (1172 words)

 epsilon and omega   (Site not responding. Last check: 2007-11-07) For all sets x there is a set z having all elements of elements of x as elements, and which has no other elements. For all sets x consisting of pairwise disjoint non-empty sets there is a set y which has exactly one element in common with every element of x. The existence of the sets needed to do this interpretation is inferred from the axioms of ZFC using the usual mathematical reasoning. www.mathematik.uni-muenchen.de /~deiser/set.html   (1423 words)

 Axiom Audio EP500 Subwoofer Review Axiom's founder, Ian Colquhoun, is a firm believer of the principles established by the NRC and is dedicated to adhering to these principles in all Axiom loudspeaker products. The polar response curve is the summed and weighted average of many curves taken from either a 180 degree or 360 degree family of curves which are usually either at 10 degree or 15 degree increments through the entire measurement range. Last fall when Axiom Audio invited us all the way to Canada to take a factory tour, I had no idea they had a couple aces in their sleeve with their new DSP driven EP500 and EP600 subwoofers. www.audioholics.com /productreviews/loudspeakers/AxiomEP500reviewp1.php   (425 words)

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