Examples
Using the sets defined above:
- 2 ∈ A
- {3,4} ∈ B
- {3,4} is a member of B
- Yellow ∉ C
- The cardinality of D = { 2, 4, 8, 10, 12 } is finite and equal to 5.
- The cardinality of P = { 2, 3, 5, 7, 11, 13, ...} (the prime numbers) is infinite (this was proven by Euclid).
Read more about this topic: Element (mathematics)
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