counting numbers of various types is a species that humans think up first to count the number of pets
set of number written as follows. N = {1 2 3,,,, 4...}
.Integer. When human society more prosperous! Until this was not enough to with application The thinking on the new type of the cardinal number 2 were come together, the results can be referred to as the "integer", which is divided into 3 is
.1) positive integers by removing timer is greater than the set of positive integers instead of delete
I = {,,, 1 2 3...}
2) integer zero. Due to the negative set equal to remove
the set of integer zero = {0} members one
.3) negative integers by removing timer is less than the negative
set of negative integers instead of I - = {- 1 - 2,,, - 3...}
Note.:: integer. = I = {..., - 3, - 2, - 1 0 1,,,,, 2 3...}
3.Rational integer number of 2 caused to it by the divisor is not equal to 0 may say that is a rational number The numbers written in a set of rational fraction
wrote as follows:
Q = {and}
| integer Note.::.
.1) rational numbers are both positive, zero, and negative integer number is 2)
all of logics. Because the writing in the form a fraction, such as
.3) number of decimal know the end. With that number is infinite decimal number is the number of iterative every course kg. Because convert a fraction, such as
4.Irrational number is written in the form of a fraction. The number of infected root but take root. With that number is infinite decimal form unique, such as
5.A real number is the set of the resulting from the set of rational numbers and the set of the union represented by a set อตรรกยะ
.
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