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Theorem rabssd 43474
Description: Restricted class abstraction in a subclass relationship. (Contributed by Glauco Siliprandi, 2-Jan-2022.)
Hypotheses
Ref Expression
rabssd.1 𝑥𝜑
rabssd.2 𝑥𝐵
rabssd.3 ((𝜑𝑥𝐴𝜒) → 𝑥𝐵)
Assertion
Ref Expression
rabssd (𝜑 → {𝑥𝐴𝜒} ⊆ 𝐵)

Proof of Theorem rabssd
StepHypRef Expression
1 rabssd.1 . . 3 𝑥𝜑
2 rabssd.3 . . . 4 ((𝜑𝑥𝐴𝜒) → 𝑥𝐵)
323exp 1119 . . 3 (𝜑 → (𝑥𝐴 → (𝜒𝑥𝐵)))
41, 3ralrimi 3238 . 2 (𝜑 → ∀𝑥𝐴 (𝜒𝑥𝐵))
5 rabssd.2 . . 3 𝑥𝐵
65rabssf 43451 . 2 ({𝑥𝐴𝜒} ⊆ 𝐵 ↔ ∀𝑥𝐴 (𝜒𝑥𝐵))
74, 6sylibr 233 1 (𝜑 → {𝑥𝐴𝜒} ⊆ 𝐵)
Colors of variables: wff setvar class
Syntax hints:  wi 4  w3a 1087  wnf 1785  wcel 2106  wnfc 2882  wral 3060  {crab 3405  wss 3913
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1913  ax-6 1971  ax-7 2011  ax-8 2108  ax-9 2116  ax-10 2137  ax-11 2154  ax-12 2171  ax-ext 2702
This theorem depends on definitions:  df-bi 206  df-an 397  df-or 846  df-3an 1089  df-tru 1544  df-ex 1782  df-nf 1786  df-sb 2068  df-clab 2709  df-cleq 2723  df-clel 2809  df-nfc 2884  df-ral 3061  df-rab 3406  df-v 3448  df-in 3920  df-ss 3930
This theorem is referenced by:  pimxrneun  43844  fsupdm  45203  finfdm  45207
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