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Theorem bnj596 31916
Description: First-order logic and set theory. (Contributed by Jonathan Ben-Naim, 3-Jun-2011.) (New usage is discouraged.)
Hypotheses
Ref Expression
bnj596.1 (𝜑 → ∀𝑥𝜑)
bnj596.2 (𝜑 → ∃𝑥𝜓)
Assertion
Ref Expression
bnj596 (𝜑 → ∃𝑥(𝜑𝜓))

Proof of Theorem bnj596
StepHypRef Expression
1 bnj596.2 . . 3 (𝜑 → ∃𝑥𝜓)
21ancli 549 . 2 (𝜑 → (𝜑 ∧ ∃𝑥𝜓))
3 bnj596.1 . . . 4 (𝜑 → ∀𝑥𝜑)
43nf5i 2141 . . 3 𝑥𝜑
5419.42 2228 . 2 (∃𝑥(𝜑𝜓) ↔ (𝜑 ∧ ∃𝑥𝜓))
62, 5sylibr 235 1 (𝜑 → ∃𝑥(𝜑𝜓))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 396  wal 1526  wex 1771
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1787  ax-4 1801  ax-5 1902  ax-6 1961  ax-7 2006  ax-10 2136  ax-12 2167
This theorem depends on definitions:  df-bi 208  df-an 397  df-ex 1772  df-nf 1776
This theorem is referenced by:  bnj1275  31984  bnj1340  31994  bnj594  32083  bnj1398  32203
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