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- $x \in U \forall x[ x \in A \cap C \leftrightarrow x \in B \cap C \land A \cup C \leftrightarrow x \in B \cup C \rightarrow A \leftrightarrow x \in B]$
- \\\\
- Nech x je ľub. prvok. Potom:\\
- $x \in A \cap C \leftrightarrow $ Podľa definície prieniku. \\
- $x \in A \land x \in C$\\\\
- $x \in B \cap C \land A \cup C \leftrightarrow $ Podľa definície zjednotenia a prieniku. \\
- $x \in B \lor x \in C \land x \in A \land x \in C$\\\\
- $x \in B \cup C \rightarrow A \leftrightarrow$ Podľa definície zjednotenia. \\
- $x \in B \land x \in C \rightarrow x \in A$\\\\
- $x \in A \lor x \in C \leftrightarrow x \in B \lor x \in C \leftrightarrow x \in A \land x \in B \leftrightarrow x \in B \land x \in C \leftrightarrow x \in A \leftrightarrow x \in B$
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