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Two sets A and B are said to be equinumerous if they have the same cardinality, i.e., if there exists a bijection f : A → B. This is denoted
- <math>A =_c B \quad \mathrm{or} \quad A \approx B<math>
The study of cardinality is often called equinumerosity. Sometimes the terms equipollent or even equivalent are used, though equivalent is a bit overused. More at cardinality.
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