Aleph is Infinite Cardinal
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Theorem
Let $x$ be an ordinal.
Then $\aleph_x$ is an infinite cardinal where $\aleph$ denotes the aleph mapping.
Proof
Let $\On$ denote the class of all ordinals.
By definition of the aleph mapping:
- $\aleph: \On \to \NN'$
where $\NN'$ denotes the class of infinite cardinals.
The theorem statement is an immediate consequence of this fact.
$\blacksquare$