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Theorem rabssd 45893
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 1137 . . 3 (𝜑 → (𝑥𝐴 → (𝜒𝑥𝐵)))
41, 3ralrimi 3265 . 2 (𝜑 → ∀𝑥𝐴 (𝜒𝑥𝐵))
5 rabssd.2 . . 3 𝑥𝐵
65rabssf 45870 . 2 ({𝑥𝐴𝜒} ⊆ 𝐵 ↔ ∀𝑥𝐴 (𝜒𝑥𝐵))
74, 6sylibr 237 1 (𝜑 → {𝑥𝐴𝜒} ⊆ 𝐵)
Colors of variables:    wff setvar class
This proof depends on syntax axioms:  wi 4  w3a 1103  wnf 1816  wcel 2146  wnfc 2912  wral 3081  {crab 3418  wss 3906
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2148  ax-9 2156  ax-10 2179  ax-11 2195  ax-12 2216  ax-ext 2737
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-ex 1813  df-nf 1817  df-sb 2100  df-clab 2744  df-cleq 2757  df-clel 2840  df-nfc 2914  df-ral 3082  df-rab 3419  df-ss 3923
This theorem is used by:  pimxrneun  46235  fsupdm  47589  finfdm  47593
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