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Theorem 19.21bbi 1448
Description: Inference removing double quantifier. (Contributed by NM, 20-Apr-1994.)
Hypothesis
Ref Expression
19.21bbi.1 (φxyψ)
Assertion
Ref Expression
19.21bbi (φψ)

Proof of Theorem 19.21bbi
StepHypRef Expression
1 19.21bbi.1 . . 3 (φxyψ)
2119.21bi 1447 . 2 (φyψ)
3219.21bi 1447 1 (φψ)
Colors of variables: wff set class
Syntax hints:  wi 4  wal 1240
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-4 1397
This theorem is referenced by:  pocl  4031  funun  4887  fununi  4910  imain  4924
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