Cartesian Product Exists and is Unique
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This theorem requires a proof.
by axiom of specification and axiom of extension
You can help $\mathsf{Pr} \infty \mathsf{fWiki}$ by crafting such a proof.
Theorem
Let $A$ and $B$ be classes.
Let $A \times B$ be the cartesian product of $A$ and $B$.
Then $A \times B$ exists and is unique.
Proof
by axiom of specification and axiom of extension
You can help $\mathsf{Pr} \infty \mathsf{fWiki}$ by crafting such a proof.
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Sources
- 2010: Raymond M. Smullyan and Melvin Fitting: Set Theory and the Continuum Problem (revised ed.) ... (previous) ... (next): Chapter $2$: Some Basics of Class-Set Theory: $\S 7$ Cartesian products
