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Theorem 19.36i 1633
Description: Inference from Theorem 19.36 of [Margaris] p. 90. (Contributed by NM, 5-Aug-1993.) (Revised by NM, 2-Feb-2015.)
Hypotheses
Ref Expression
19.36i.1 𝑥𝜓
19.36i.2 𝑥(𝜑𝜓)
Assertion
Ref Expression
19.36i (∀𝑥𝜑𝜓)

Proof of Theorem 19.36i
StepHypRef Expression
1 19.36i.2 . . 3 𝑥(𝜑𝜓)
2119.35i 1587 . 2 (∀𝑥𝜑 → ∃𝑥𝜓)
3 19.36i.1 . . 3 𝑥𝜓
4 id 19 . . 3 (𝜓𝜓)
53, 4exlimi 1556 . 2 (∃𝑥𝜓𝜓)
62, 5syl 14 1 (∀𝑥𝜑𝜓)
Colors of variables: wff set class
Syntax hints:  wi 4  wal 1312  wnf 1419  wex 1451
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-5 1406  ax-gen 1408  ax-ie1 1452  ax-ie2 1453  ax-4 1470  ax-ial 1497
This theorem depends on definitions:  df-bi 116  df-nf 1420
This theorem is referenced by:  19.36aiv  1855  vtoclf  2711
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