Abstract symbols, can be seen as an object
The whole is composed of all objects collection
Each object constitutes a collection called this collection of elements
No elements set, the empty set
Collection of nature
- Certainty : as an element of a set, it must be determined
- VARIATION : For a given set of elements of the collection must be different
Finite set
Having a finite set of elements
Infinite set
It contains an infinite set of elements
Natural numbers
Non-negative integers all set constituted
Positive integer Collection
0 in the exclusion set of natural numbers
Integer Collection
A collection consisting of all integers
Rational numbers
A collection consisting of all rational numbers
Set of real numbers
The entire set of real numbers composed of
Representation of sets
Enumeration method
Write means within the braces "{}" is a collection of
Characteristic properties described in Method
- For example, a set of positive even configuration, each element of its nature, "divisible by 2, and greater than 0"
- In the range of real numbers, all the elements of set A satisfy the equation X 2 -. 1 = 0, then set A is used to represent X 2 -. 1 = 0 Solution Set