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Theorem reximdd 44548
Description: Deduction from Theorem 19.22 of [Margaris] p. 90. (Contributed by Glauco Siliprandi, 5-Feb-2022.)
Hypotheses
Ref Expression
reximdd.1 𝑥𝜑
reximdd.2 ((𝜑𝑥𝐴𝜓) → 𝜒)
reximdd.3 (𝜑 → ∃𝑥𝐴 𝜓)
Assertion
Ref Expression
reximdd (𝜑 → ∃𝑥𝐴 𝜒)

Proof of Theorem reximdd
StepHypRef Expression
1 reximdd.3 . 2 (𝜑 → ∃𝑥𝐴 𝜓)
2 reximdd.1 . . 3 𝑥𝜑
3 reximdd.2 . . . 4 ((𝜑𝑥𝐴𝜓) → 𝜒)
433exp 1116 . . 3 (𝜑 → (𝑥𝐴 → (𝜓𝜒)))
52, 4reximdai 3256 . 2 (𝜑 → (∃𝑥𝐴 𝜓 → ∃𝑥𝐴 𝜒))
61, 5mpd 15 1 (𝜑 → ∃𝑥𝐴 𝜒)
Colors of variables: wff setvar class
Syntax hints:  wi 4  w3a 1084  wnf 1777  wcel 2098  wrex 3067
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1789  ax-4 1803  ax-5 1905  ax-6 1963  ax-7 2003  ax-12 2166
This theorem depends on definitions:  df-bi 206  df-an 395  df-3an 1086  df-ex 1774  df-nf 1778  df-ral 3059  df-rex 3068
This theorem is referenced by:  iinss2d  44558  xlimmnfvlem2  45250  xlimmnfv  45251  xlimpnfvlem2  45254  xlimpnfv  45255  fsupdm  46259  finfdm  46263
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