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Theorem exlimdd 1883
Description: Existential elimination rule of natural deduction. (Contributed by Mario Carneiro, 9-Feb-2017.)
Hypotheses
Ref Expression
exlimdd.1 𝑥𝜑
exlimdd.2 𝑥𝜒
exlimdd.3 (𝜑 → ∃𝑥𝜓)
exlimdd.4 ((𝜑𝜓) → 𝜒)
Assertion
Ref Expression
exlimdd (𝜑𝜒)

Proof of Theorem exlimdd
StepHypRef Expression
1 exlimdd.3 . 2 (𝜑 → ∃𝑥𝜓)
2 exlimdd.1 . . 3 𝑥𝜑
3 exlimdd.2 . . 3 𝑥𝜒
4 exlimdd.4 . . . 4 ((𝜑𝜓) → 𝜒)
54ex 115 . . 3 (𝜑 → (𝜓𝜒))
62, 3, 5exlimd 1608 . 2 (𝜑 → (∃𝑥𝜓𝜒))
71, 6mpd 13 1 (𝜑𝜒)
Colors of variables: wff set class
Syntax hints:  wi 4  wa 104  wnf 1471  wex 1503
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia3 108  ax-5 1458  ax-gen 1460  ax-ie2 1505  ax-4 1521
This theorem depends on definitions:  df-bi 117  df-nf 1472
This theorem is referenced by:  fvmptdf  5619  ovmpodf  6023  exmidfodomrlemr  7219  exmidfodomrlemrALT  7220  ltexprlemm  7617  dfgrp3mlem  13008
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