Description: The elements of a pair from a subset of the set of all unordered pairs over a given set V are elements of the set V . (Contributed by AV, 21-Nov-2021)
Ref | Expression | ||
---|---|---|---|
Assertion | prsssprel | |- ( ( P C_ ( Pairs ` V ) /\ { X , Y } e. P /\ ( X e. U /\ Y e. W ) ) -> ( X e. V /\ Y e. V ) ) |
Step | Hyp | Ref | Expression |
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1 | ssel2 | |- ( ( P C_ ( Pairs ` V ) /\ { X , Y } e. P ) -> { X , Y } e. ( Pairs ` V ) ) |
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2 | prsprel | |- ( ( { X , Y } e. ( Pairs ` V ) /\ ( X e. U /\ Y e. W ) ) -> ( X e. V /\ Y e. V ) ) |
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3 | 1 2 | stoic3 | |- ( ( P C_ ( Pairs ` V ) /\ { X , Y } e. P /\ ( X e. U /\ Y e. W ) ) -> ( X e. V /\ Y e. V ) ) |