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Theorem abbi1dv 2237
Description: Deduction from a wff to a class abstraction. (Contributed by NM, 9-Jul-1994.)
Hypothesis
Ref Expression
abbildv.1 (𝜑 → (𝜓𝑥𝐴))
Assertion
Ref Expression
abbi1dv (𝜑 → {𝑥𝜓} = 𝐴)
Distinct variable groups:   𝑥,𝐴   𝜑,𝑥
Allowed substitution hint:   𝜓(𝑥)

Proof of Theorem abbi1dv
StepHypRef Expression
1 abbildv.1 . . 3 (𝜑 → (𝜓𝑥𝐴))
21alrimiv 1830 . 2 (𝜑 → ∀𝑥(𝜓𝑥𝐴))
3 abeq1 2227 . 2 ({𝑥𝜓} = 𝐴 ↔ ∀𝑥(𝜓𝑥𝐴))
42, 3sylibr 133 1 (𝜑 → {𝑥𝜓} = 𝐴)
Colors of variables: wff set class
Syntax hints:  wi 4  wb 104  wal 1314   = wceq 1316  wcel 1465  {cab 2103
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 1408  ax-7 1409  ax-gen 1410  ax-ie1 1454  ax-ie2 1455  ax-8 1467  ax-11 1469  ax-4 1472  ax-17 1491  ax-i9 1495  ax-ial 1499  ax-i5r 1500  ax-ext 2099
This theorem depends on definitions:  df-bi 116  df-nf 1422  df-sb 1721  df-clab 2104  df-cleq 2110  df-clel 2113
This theorem is referenced by:  abidnf  2825  csbtt  2985  csbvarg  3000  csbie2g  3020  abvor0dc  3356  iinxsng  3856  shftuz  10557
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