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Theorem 2ralbida 2970
 Description: Formula-building rule for restricted universal quantifier (deduction rule). (Contributed by NM, 24-Feb-2004.)
Hypotheses
Ref Expression
2ralbida.1 𝑥𝜑
2ralbida.2 𝑦𝜑
2ralbida.3 ((𝜑 ∧ (𝑥𝐴𝑦𝐵)) → (𝜓𝜒))
Assertion
Ref Expression
2ralbida (𝜑 → (∀𝑥𝐴𝑦𝐵 𝜓 ↔ ∀𝑥𝐴𝑦𝐵 𝜒))
Distinct variable groups:   𝑥,𝑦   𝑦,𝐴
Allowed substitution hints:   𝜑(𝑥,𝑦)   𝜓(𝑥,𝑦)   𝜒(𝑥,𝑦)   𝐴(𝑥)   𝐵(𝑥,𝑦)

Proof of Theorem 2ralbida
StepHypRef Expression
1 2ralbida.1 . 2 𝑥𝜑
2 2ralbida.2 . . . 4 𝑦𝜑
3 nfv 1830 . . . 4 𝑦 𝑥𝐴
42, 3nfan 1816 . . 3 𝑦(𝜑𝑥𝐴)
5 2ralbida.3 . . . 4 ((𝜑 ∧ (𝑥𝐴𝑦𝐵)) → (𝜓𝜒))
65anassrs 678 . . 3 (((𝜑𝑥𝐴) ∧ 𝑦𝐵) → (𝜓𝜒))
74, 6ralbida 2965 . 2 ((𝜑𝑥𝐴) → (∀𝑦𝐵 𝜓 ↔ ∀𝑦𝐵 𝜒))
81, 7ralbida 2965 1 (𝜑 → (∀𝑥𝐴𝑦𝐵 𝜓 ↔ ∀𝑥𝐴𝑦𝐵 𝜒))
 Colors of variables: wff setvar class Syntax hints:   → wi 4   ↔ wb 195   ∧ wa 383  Ⅎwnf 1699   ∈ wcel 1977  ∀wral 2896 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1713  ax-4 1728  ax-5 1827  ax-6 1875  ax-7 1922  ax-12 2034 This theorem depends on definitions:  df-bi 196  df-or 384  df-an 385  df-tru 1478  df-ex 1696  df-nf 1701  df-ral 2901 This theorem is referenced by: (None)
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