Class 11 Maths Sets Empty set

 Empty or null or void set

Set which does not contain any element is called the empty set or the null set or the void set. The empty set is denoted by the symbol φ or { }.

Examples of empty sets.  Let A = {x : 5 < x < 6, x is a natural number}. Then A is the empty set, Thus we dente A set by the symbol φ or { }.

Please note that A = {x : 5 < x < 6, x is a real number} is not empty set, as there are many real number between 5 & 6.


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