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Theorem 19.35ri 1959
Description: Inference associated with 19.35 1957. (Contributed by NM, 12-Mar-1993.)
Hypothesis
Ref Expression
19.35ri.1 (∀𝑥𝜑 → ∃𝑥𝜓)
Assertion
Ref Expression
19.35ri 𝑥(𝜑𝜓)

Proof of Theorem 19.35ri
StepHypRef Expression
1 19.35ri.1 . 2 (∀𝑥𝜑 → ∃𝑥𝜓)
2 19.35 1957 . 2 (∃𝑥(𝜑𝜓) ↔ (∀𝑥𝜑 → ∃𝑥𝜓))
31, 2mpbir 221 1 𝑥(𝜑𝜓)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wal 1629  wex 1852
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1870  ax-4 1885
This theorem depends on definitions:  df-bi 197  df-ex 1853
This theorem is referenced by:  qexmid  2217  axrep1  4905  axextnd  9615  axinfnd  9630  bj-axrep1  33124
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