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Finite set information


In mathematics, particularly set theory, a finite set is a set that has a finite number of elements. Informally, a finite set is a set which one could in principle count and finish counting. For example,

is a finite set with five elements. The number of elements of a finite set is a natural number (possibly zero) and is called the cardinality (or the cardinal number) of the set. A set that is not a finite set is called an infinite set. For example, the set of all positive integers is infinite:

Finite sets are particularly important in combinatorics, the mathematical study of counting. Many arguments involving finite sets rely on the pigeonhole principle, which states that there cannot exist an injective function from a larger finite set to a smaller finite set.

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Finite set

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mathematics, particularly set theory, a finite set is a set that has a finite number of elements. Informally, a finite set is a set which one could in principle...

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Hereditarily finite set

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mathematics and set theory, hereditarily finite sets are defined as finite sets whose elements are all hereditarily finite sets. In other words, the set itself...

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Cardinality

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numbers. While the cardinality of a finite set is just the number of its elements, extending the notion to infinite sets usually starts with defining the...

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Cofiniteness

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cofinite subset of a set X {\displaystyle X} is a subset A {\displaystyle A} whose complement in X {\displaystyle X} is a finite set. In other words, A...

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Infinite set

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In set theory, an infinite set is a set that is not a finite set. Infinite sets may be countable or uncountable. The set of natural numbers (whose existence...

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Finite field

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algebraic geometry, Galois theory, finite geometry, cryptography and coding theory. A finite field is a finite set that is a field; this means that multiplication...

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Power set

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z}, {y, z}, {x, y, z}}. If S is a finite set with the cardinality |S| = n (i.e., the number of all elements in the set S is n), then the number of all the...

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Deterministic finite automaton

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deterministic finite automaton (DFA)—also known as deterministic finite acceptor (DFA), deterministic finite-state machine (DFSM), or deterministic finite-state...

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Ordinal number

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(first, second, nth, etc.) aimed to extend enumeration to infinite sets. A finite set can be enumerated by successively labeling each element with the least...

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Discrete mathematics

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term "discrete mathematics". The set of objects studied in discrete mathematics can be finite or infinite. The term finite mathematics is sometimes applied...

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Finite

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Look up finite, finitely, or finiteness in Wiktionary, the free dictionary. Finite is the opposite of infinite. It may refer to: Finite set, a set whose...

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Cardinal number

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a set. In the case of a finite set, its cardinal number, or cardinality is therefore a natural number. For dealing with the case of infinite sets, the...

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Lexicographic order

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used in combinatorics, orders subsets of a given finite set by assigning a total order to the finite set, and converting subsets into increasing sequences...

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Countable set

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mathematics, a set is countable if either it is finite or it can be made in one to one correspondence with the set of natural numbers. Equivalently, a set is countable...

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Enumeration

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elements of finite sets, usually grouped into infinite families, such as the family of sets each consisting of all permutations of some finite set. There are...

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Empty set

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sum of the elements of a finite set, one is inevitably led to the convention that the sum of the elements of the empty set (the empty sum) is zero. The...

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Nondeterministic finite automaton

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In automata theory, a finite-state machine is called a deterministic finite automaton (DFA), if each of its transitions is uniquely determined by its...

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Counting

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of determining the number of elements of a finite set of objects; that is, determining the size of a set. The traditional way of counting consists of...

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New Foundations

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(which is actually an indirect reference to types in Typed Set Theory). The axioms in a finite axiomatization correspond to natural basic constructions...

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Finite topological space

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In mathematics, a finite topological space is a topological space for which the underlying point set is finite. That is, it is a topological space which...

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Total order

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condition. In other contexts, only chains that are finite sets are considered. In this case, one talks of a finite chain, often shortened as a chain. In this...

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Subset

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B . {\displaystyle A\subseteq B{\text{ if and only if }}A\cup B=B.} A finite set A is a subset of B, if and only if the cardinality of their intersection...

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Fuzzy set

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fuzzy set A = ( U , m ) {\displaystyle A=(U,m)} . For a finite set U = { x 1 , … , x n } , {\displaystyle U=\{x_{1},\dots ,x_{n}\},} the fuzzy set ( U ...

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Axiom of choice

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II-finite, III-finite, IV-finite, V-finite, VI-finite and VII-finite. I-finiteness is the same as normal finiteness. IV-finiteness is the same as Dedekind-finiteness...

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