Proposition 2.3.4.1.2 (0036): Properties of Ordered Pairs

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Let $A$ and $B$ be sets.

Uniqueness. Let $A$, $B$, $C$, and $D$ be sets. The following conditions are equivalent:
1. We have $\webleft (A,B\webright )=\webleft (C,D\webright )$.
2. We have $A=C$ and $B=D$.

Proof of Proposition 2.3.4.1.2.

Item 1: Uniqueness

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