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Theorem r3al 3121
Description: Triple restricted universal quantification. (Contributed by NM, 19-Nov-1995.) (Proof shortened by Wolf Lammen, 30-Dec-2019.)
Assertion
Ref Expression
r3al (∀𝑥𝐴𝑦𝐵𝑧𝐶 𝜑 ↔ ∀𝑥𝑦𝑧((𝑥𝐴𝑦𝐵𝑧𝐶) → 𝜑))
Distinct variable groups:   𝑥,𝑦,𝑧   𝑦,𝐴,𝑧   𝑧,𝐵
Allowed substitution hints:   𝜑(𝑥,𝑦,𝑧)   𝐴(𝑥)   𝐵(𝑥,𝑦)   𝐶(𝑥,𝑦,𝑧)

Proof of Theorem r3al
StepHypRef Expression
1 r2al 3120 . 2 (∀𝑥𝐴𝑦𝐵𝑧𝐶 𝜑 ↔ ∀𝑥𝑦((𝑥𝐴𝑦𝐵) → ∀𝑧𝐶 𝜑))
2 19.21v 1982 . . . 4 (∀𝑧((𝑥𝐴𝑦𝐵) → (𝑧𝐶𝜑)) ↔ ((𝑥𝐴𝑦𝐵) → ∀𝑧(𝑧𝐶𝜑)))
3 df-3an 1073 . . . . . . 7 ((𝑥𝐴𝑦𝐵𝑧𝐶) ↔ ((𝑥𝐴𝑦𝐵) ∧ 𝑧𝐶))
43imbi1i 341 . . . . . 6 (((𝑥𝐴𝑦𝐵𝑧𝐶) → 𝜑) ↔ (((𝑥𝐴𝑦𝐵) ∧ 𝑧𝐶) → 𝜑))
5 impexp 443 . . . . . 6 ((((𝑥𝐴𝑦𝐵) ∧ 𝑧𝐶) → 𝜑) ↔ ((𝑥𝐴𝑦𝐵) → (𝑧𝐶𝜑)))
64, 5bitri 267 . . . . 5 (((𝑥𝐴𝑦𝐵𝑧𝐶) → 𝜑) ↔ ((𝑥𝐴𝑦𝐵) → (𝑧𝐶𝜑)))
76albii 1863 . . . 4 (∀𝑧((𝑥𝐴𝑦𝐵𝑧𝐶) → 𝜑) ↔ ∀𝑧((𝑥𝐴𝑦𝐵) → (𝑧𝐶𝜑)))
8 df-ral 3094 . . . . 5 (∀𝑧𝐶 𝜑 ↔ ∀𝑧(𝑧𝐶𝜑))
98imbi2i 328 . . . 4 (((𝑥𝐴𝑦𝐵) → ∀𝑧𝐶 𝜑) ↔ ((𝑥𝐴𝑦𝐵) → ∀𝑧(𝑧𝐶𝜑)))
102, 7, 93bitr4ri 296 . . 3 (((𝑥𝐴𝑦𝐵) → ∀𝑧𝐶 𝜑) ↔ ∀𝑧((𝑥𝐴𝑦𝐵𝑧𝐶) → 𝜑))
11102albii 1864 . 2 (∀𝑥𝑦((𝑥𝐴𝑦𝐵) → ∀𝑧𝐶 𝜑) ↔ ∀𝑥𝑦𝑧((𝑥𝐴𝑦𝐵𝑧𝐶) → 𝜑))
121, 11bitri 267 1 (∀𝑥𝐴𝑦𝐵𝑧𝐶 𝜑 ↔ ∀𝑥𝑦𝑧((𝑥𝐴𝑦𝐵𝑧𝐶) → 𝜑))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 198  wa 386  w3a 1071  wal 1599  wcel 2106  wral 3089
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1839  ax-4 1853  ax-5 1953
This theorem depends on definitions:  df-bi 199  df-an 387  df-3an 1073  df-ex 1824  df-ral 3094
This theorem is referenced by:  pocl  5281  dfwe2  7259  isass  34253  ntrneikb  39330  ntrneixb  39331
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