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Theorem elab3g 3617
Description: Membership in a class abstraction, with a weaker antecedent than elabg 3608. (Contributed by NM, 29-Aug-2006.)
Hypothesis
Ref Expression
elab3g.1 (𝑥 = 𝐴 → (𝜑𝜓))
Assertion
Ref Expression
elab3g ((𝜓𝐴𝐵) → (𝐴 ∈ {𝑥𝜑} ↔ 𝜓))
Distinct variable groups:   𝜓,𝑥   𝑥,𝐴
Allowed substitution hints:   𝜑(𝑥)   𝐵(𝑥)

Proof of Theorem elab3g
StepHypRef Expression
1 elab3g.1 . . . . 5 (𝑥 = 𝐴 → (𝜑𝜓))
21elabg 3608 . . . 4 (𝐴 ∈ {𝑥𝜑} → (𝐴 ∈ {𝑥𝜑} ↔ 𝜓))
32ibi 266 . . 3 (𝐴 ∈ {𝑥𝜑} → 𝜓)
4 pm2.21 123 . . 3 𝜓 → (𝜓𝐴 ∈ {𝑥𝜑}))
53, 4impbid2 225 . 2 𝜓 → (𝐴 ∈ {𝑥𝜑} ↔ 𝜓))
61elabg 3608 . 2 (𝐴𝐵 → (𝐴 ∈ {𝑥𝜑} ↔ 𝜓))
75, 6ja 186 1 ((𝜓𝐴𝐵) → (𝐴 ∈ {𝑥𝜑} ↔ 𝜓))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wb 205   = wceq 1539  wcel 2106  {cab 2715
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1798  ax-4 1812  ax-5 1913  ax-6 1971  ax-7 2011  ax-8 2108  ax-9 2116  ax-ext 2709
This theorem depends on definitions:  df-bi 206  df-an 397  df-tru 1542  df-ex 1783  df-sb 2068  df-clab 2716  df-cleq 2730  df-clel 2816
This theorem is referenced by:  elab3  3618  elssabg  5260  elrnmptg  5863  elrelimasn  5988  elmapg  8617  isust  23344  ellimc  25026  isismty  35946  clublem  41178
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