The real number system
.Is the number that can match the one on one with points on a straight line with infinite length (straight line). "The real numbers is enacted to separate set out this imaginary number.(real analysis)
.1. Irrational number means the number that cannot be written in the form of a fraction of integers or ทศนิ premium again, for example, √ 2 √ 3 √ 5,,, - √ 2, - √ 3, - √ 5 or distortion, which is 3.14159265...
2.Rational number means the number can be written in the form of a fraction of integers or ทศนิยมซ้ำได้. For example,
, denoted by 0.5000...
. Represented by a 0.2000...
rational number rational number system can be divided into 2 type is
1.Rational number is not an integer. I mean, number that can be written in the form of a fraction, or ทศนิ to duplicate, but not an integer. For example,
2. Integer. Mean number of an element of a set I = {... - 4, - 3, - 2, - 1 0 1,,,,,, 2 3 4...} when limit I is the set of integers
integer integer system also can be divided into a 3 types together
1. Negative integer Mean of a souvenir I - without I - = {... - 4, - 3, - 2, - 1}
when I - a set of negative integers
.2. The integer zero (0)
3. Positive integer, meaning of a souvenir I without I = {,,, 1 2 3 4,...}
when I is the set of positive integers
.Hold call as "count", which was written for the set of cardinal numbers with the symbol N without N = I = {,,, 1 2 3 4,...}.
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