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Two sets A and B are said to be equivalent(≡) if each element of A is also an element of B and each element of B is also an element of A.
If elements are repetitive in one set, then it is not required for it to repeat in the other set for the two sets to be equivalent.
Examples ⇒
{ 1, 2, 3 } ≡ { 1, 3, 2}
{ 1, 2, 3 } ≡ { 1, 3, 2, 2, 1, 2, 3, 3 }
{ 1, 2, 3 } ≢ { 1, 3, 2, 2, 1, 2, 3, 3, 4 } Since 4 is not in first set
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