Aleph Zero
In set theory, the letter aleph denotes a sequence of numbers used to represent the cardinality (size) of different infinities. Aleph zero (or aleph naught or aleph null) is the first of these numbers and represents the set of natural numbers (1, 2, 3,...). As the smallest infinity, aleph zero cannot be calculated from the finite of numbers. Instead, belief in its existence requires a leap of faith, as do many other things in the world require.
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