The set of natural numbers (1, 2, 3, ...)
The set of all possible strings that can be formed by the alphabet (e.g. slkdfe, lelllell, aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa, ...)
The set of all abstract ideas (e.g. existentialism, freedom, the set of all abstract ideas, ...)
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stars in the sky that's the some example of infinite sets
sets
Closed sets and open sets, or finite and infinite sets.
There are finite sets, countably infinite sets and uncountably infinite sets.
Closed sets and open sets, or finite and infinite sets.