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Theorem ss2ralv 3986
 Description: Two quantifications restricted to a subclass. (Contributed by AV, 11-Mar-2023.)
Assertion
Ref Expression
ss2ralv (𝐴𝐵 → (∀𝑥𝐵𝑦𝐵 𝜑 → ∀𝑥𝐴𝑦𝐴 𝜑))
Distinct variable groups:   𝑥,𝐴   𝑥,𝐵   𝑦,𝐴   𝑦,𝐵
Allowed substitution hints:   𝜑(𝑥,𝑦)

Proof of Theorem ss2ralv
StepHypRef Expression
1 ssralv 3984 . . 3 (𝐴𝐵 → (∀𝑦𝐵 𝜑 → ∀𝑦𝐴 𝜑))
21ralimdv 3148 . 2 (𝐴𝐵 → (∀𝑥𝐵𝑦𝐵 𝜑 → ∀𝑥𝐵𝑦𝐴 𝜑))
3 ssralv 3984 . 2 (𝐴𝐵 → (∀𝑥𝐵𝑦𝐴 𝜑 → ∀𝑥𝐴𝑦𝐴 𝜑))
42, 3syld 47 1 (𝐴𝐵 → (∀𝑥𝐵𝑦𝐵 𝜑 → ∀𝑥𝐴𝑦𝐴 𝜑))
 Colors of variables: wff setvar class Syntax hints:   → wi 4  ∀wral 3109   ⊆ wss 3884 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 1911  ax-6 1970  ax-7 2015  ax-8 2114  ax-9 2122  ax-ext 2773 This theorem depends on definitions:  df-bi 210  df-an 400  df-ex 1782  df-sb 2070  df-clab 2780  df-cleq 2794  df-clel 2873  df-ral 3114  df-v 3446  df-in 3891  df-ss 3901 This theorem is referenced by:  poss  5444  soss  5461  dffi3  8883  isercolllem1  15017  cfilres  23904  lgsdchr  25943  dffltz  39612
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