An element of a set, also called member of a set, is an object that belongs to the set. For example, 13 is an element or object of the set of prime numbers.
1.
The set of natural numbers is {1, 2, 3, 4, 5, ... }
2 is an element of the set of natural numbers.
2.
The set of countries in Europe is {France, Norway, Italy, Germany, Portugal, ... }
Portugal is an element of the set of countries in Europe.
3.
The set of real numbers smaller than 10 and bigger than 2 can be written as {x / x is a real number and 2 < x < 10}
4.5693 is an element of the set of real numbers smaller than 10 and bigger than 2
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