Tuesday 19 April 2016

Finite set

Finite set:-
              In mathematics, a finite set is a  set that has a finite number of elements.\{2,4,6,8,10\}\,\! s a finite set with five elements. The number of elements of a finite set is a natural number (a non-negative integer) and is called the cardinality of the set. A set that is not finite is called infinite. For example, the set of all positive integers is infinite  :\{1,2,3,\ldots\}.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.
Example. {2,4,6,8} this is a finite set because it have finite number of element....

A= {1,2,3,4,5,6,7,8,9} it is also a finite set....

In other way.

In a finite set the element can be listed if it has a limited i.e. countable by natural number 1, 2, 3, ……… and the process of listing terminates at a certain natural number N.
The number of distinct elements counted in a finite set S is denoted by n(S). The number of elements of a finite set A is called the order or cardinal number of a set A and is symbolically denoted by n(A). Thus, if the set A be that of the English alphabets, then n(A) = 26: For, it contains 26 elements in it. Again if the set A be the vowels of the English alphabets i.e. A = {a, e, i, o, u} then n(A) = 5.

there are more example of finite set  like group of class 12 students 
group of all real number define as R={x:x is a number on real line}
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