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New posts in cardinals
Proving the Cantor Pairing Function Bijective
elementary-set-theory
cardinals
Defining cardinality in the absence of choice
set-theory
cardinals
axiom-of-choice
The cartesian product $\mathbb{N} \times \mathbb{N}$ is countable
elementary-set-theory
cardinals
For every infinite $S$, $|S|=|S\times S|$ implies the Axiom of choice
set-theory
cardinals
axiom-of-choice
How do we know an $ \aleph_1 $ exists at all?
set-theory
cardinals
Cartesian Product of Two Countable Sets is Countable [closed]
elementary-set-theory
cardinals
Cardinality of set of real continuous functions
real-analysis
elementary-set-theory
cardinals
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