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Theorem 19.21bi 1758
Description: Inference from Theorem 19.21 of [Margaris] p. 90. (Contributed by NM, 5-Aug-1993.)
Hypothesis
Ref Expression
19.21bi.1 (φxψ)
Assertion
Ref Expression
19.21bi (φψ)

Proof of Theorem 19.21bi
StepHypRef Expression
1 19.21bi.1 . 2 (φxψ)
2 sp 1747 . 2 (xψψ)
31, 2syl 15 1 (φψ)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wal 1540
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1546  ax-5 1557  ax-17 1616  ax-9 1654  ax-8 1675  ax-11 1746
This theorem depends on definitions:  df-bi 177  df-ex 1542
This theorem is referenced by:  19.21bbi  1865  eqeq1  2359  eleq2  2414  r19.21bi  2712  ssel  3267  copsex2t  4608  funun  5146  fvopab4t  5385
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