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Theorem rexlimi 2545
Description: Inference from Theorem 19.21 of [Margaris] p. 90. (Restricted quantifier version.) (Contributed by NM, 30-Nov-2003.) (Proof shortened by Andrew Salmon, 30-May-2011.)
Hypotheses
Ref Expression
rexlimi.1 𝑥𝜓
rexlimi.2 (𝑥𝐴 → (𝜑𝜓))
Assertion
Ref Expression
rexlimi (∃𝑥𝐴 𝜑𝜓)

Proof of Theorem rexlimi
StepHypRef Expression
1 rexlimi.2 . . 3 (𝑥𝐴 → (𝜑𝜓))
21rgen 2488 . 2 𝑥𝐴 (𝜑𝜓)
3 rexlimi.1 . . 3 𝑥𝜓
43r19.23 2543 . 2 (∀𝑥𝐴 (𝜑𝜓) ↔ (∃𝑥𝐴 𝜑𝜓))
52, 4mpbi 144 1 (∃𝑥𝐴 𝜑𝜓)
Colors of variables: wff set class
Syntax hints:  wi 4  wnf 1437  wcel 1481  wral 2417  wrex 2418
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 1424  ax-gen 1426  ax-ie1 1470  ax-ie2 1471  ax-4 1488  ax-ial 1515  ax-i5r 1516
This theorem depends on definitions:  df-bi 116  df-nf 1438  df-ral 2422  df-rex 2423
This theorem is referenced by:  rexlimiv  2546  r19.29af2  2575  triun  4046  reusv1  4386  reusv3  4388  onintrab2im  4441  fun11iun  5395  fisumcom2  11238
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