Explain the relation between cardinality of a set
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Cardinality places an equivalence relation on sets, which declares two sets A A A and B B B are equivalent when there exists a bijection A → B A \to B A→B. The equivalence classes thus obtained are called cardinal numbers. For a set S S S, let ∣ S ∣ |S| ∣S∣ denote its cardinal number.
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