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Theorem 3reeanv 3223
Description: Rearrange three restricted existential quantifiers. (Contributed by Jeff Madsen, 11-Jun-2010.)
Assertion
Ref Expression
3reeanv (∃𝑥𝐴𝑦𝐵𝑧𝐶 (𝜑𝜓𝜒) ↔ (∃𝑥𝐴 𝜑 ∧ ∃𝑦𝐵 𝜓 ∧ ∃𝑧𝐶 𝜒))
Distinct variable groups:   𝜑,𝑦,𝑧   𝜓,𝑥,𝑧   𝜒,𝑥,𝑦   𝑦,𝐴   𝑥,𝐵,𝑧   𝑥,𝐶,𝑦
Allowed substitution hints:   𝜑(𝑥)   𝜓(𝑦)   𝜒(𝑧)   𝐴(𝑥,𝑧)   𝐵(𝑦)   𝐶(𝑧)

Proof of Theorem 3reeanv
StepHypRef Expression
1 r19.41v 3184 . . 3 (∃𝑥𝐴 (∃𝑦𝐵 (𝜑𝜓) ∧ ∃𝑧𝐶 𝜒) ↔ (∃𝑥𝐴𝑦𝐵 (𝜑𝜓) ∧ ∃𝑧𝐶 𝜒))
2 reeanv 3222 . . 3 (∃𝑥𝐴𝑦𝐵 (𝜑𝜓) ↔ (∃𝑥𝐴 𝜑 ∧ ∃𝑦𝐵 𝜓))
31, 2bianbi 625 . 2 (∃𝑥𝐴 (∃𝑦𝐵 (𝜑𝜓) ∧ ∃𝑧𝐶 𝜒) ↔ ((∃𝑥𝐴 𝜑 ∧ ∃𝑦𝐵 𝜓) ∧ ∃𝑧𝐶 𝜒))
4 df-3an 1086 . . . . 5 ((𝜑𝜓𝜒) ↔ ((𝜑𝜓) ∧ 𝜒))
542rexbii 3125 . . . 4 (∃𝑦𝐵𝑧𝐶 (𝜑𝜓𝜒) ↔ ∃𝑦𝐵𝑧𝐶 ((𝜑𝜓) ∧ 𝜒))
6 reeanv 3222 . . . 4 (∃𝑦𝐵𝑧𝐶 ((𝜑𝜓) ∧ 𝜒) ↔ (∃𝑦𝐵 (𝜑𝜓) ∧ ∃𝑧𝐶 𝜒))
75, 6bitri 274 . . 3 (∃𝑦𝐵𝑧𝐶 (𝜑𝜓𝜒) ↔ (∃𝑦𝐵 (𝜑𝜓) ∧ ∃𝑧𝐶 𝜒))
87rexbii 3090 . 2 (∃𝑥𝐴𝑦𝐵𝑧𝐶 (𝜑𝜓𝜒) ↔ ∃𝑥𝐴 (∃𝑦𝐵 (𝜑𝜓) ∧ ∃𝑧𝐶 𝜒))
9 df-3an 1086 . 2 ((∃𝑥𝐴 𝜑 ∧ ∃𝑦𝐵 𝜓 ∧ ∃𝑧𝐶 𝜒) ↔ ((∃𝑥𝐴 𝜑 ∧ ∃𝑦𝐵 𝜓) ∧ ∃𝑧𝐶 𝜒))
103, 8, 93bitr4i 302 1 (∃𝑥𝐴𝑦𝐵𝑧𝐶 (𝜑𝜓𝜒) ↔ (∃𝑥𝐴 𝜑 ∧ ∃𝑦𝐵 𝜓 ∧ ∃𝑧𝐶 𝜒))
Colors of variables: wff setvar class
Syntax hints:  wb 205  wa 394  w3a 1084  wrex 3066
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1789  ax-4 1803  ax-5 1905
This theorem depends on definitions:  df-bi 206  df-an 395  df-3an 1086  df-ex 1774  df-ral 3058  df-rex 3067
This theorem is referenced by:  poxp2  8152  poxp3  8159  imasmnd2  18736  imasgrp2  19016  imasrng  20122  imasring  20271  axeuclid  28792  lshpkrlem6  38591
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