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Theorem 3reeanv 3255
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 3236 . . 3 (∃𝑥𝐴 (∃𝑦𝐵 (𝜑𝜓) ∧ ∃𝑧𝐶 𝜒) ↔ (∃𝑥𝐴𝑦𝐵 (𝜑𝜓) ∧ ∃𝑧𝐶 𝜒))
2 reeanv 3254 . . . 4 (∃𝑥𝐴𝑦𝐵 (𝜑𝜓) ↔ (∃𝑥𝐴 𝜑 ∧ ∃𝑦𝐵 𝜓))
32anbi1i 617 . . 3 ((∃𝑥𝐴𝑦𝐵 (𝜑𝜓) ∧ ∃𝑧𝐶 𝜒) ↔ ((∃𝑥𝐴 𝜑 ∧ ∃𝑦𝐵 𝜓) ∧ ∃𝑧𝐶 𝜒))
41, 3bitri 266 . 2 (∃𝑥𝐴 (∃𝑦𝐵 (𝜑𝜓) ∧ ∃𝑧𝐶 𝜒) ↔ ((∃𝑥𝐴 𝜑 ∧ ∃𝑦𝐵 𝜓) ∧ ∃𝑧𝐶 𝜒))
5 df-3an 1109 . . . . 5 ((𝜑𝜓𝜒) ↔ ((𝜑𝜓) ∧ 𝜒))
652rexbii 3189 . . . 4 (∃𝑦𝐵𝑧𝐶 (𝜑𝜓𝜒) ↔ ∃𝑦𝐵𝑧𝐶 ((𝜑𝜓) ∧ 𝜒))
7 reeanv 3254 . . . 4 (∃𝑦𝐵𝑧𝐶 ((𝜑𝜓) ∧ 𝜒) ↔ (∃𝑦𝐵 (𝜑𝜓) ∧ ∃𝑧𝐶 𝜒))
86, 7bitri 266 . . 3 (∃𝑦𝐵𝑧𝐶 (𝜑𝜓𝜒) ↔ (∃𝑦𝐵 (𝜑𝜓) ∧ ∃𝑧𝐶 𝜒))
98rexbii 3188 . 2 (∃𝑥𝐴𝑦𝐵𝑧𝐶 (𝜑𝜓𝜒) ↔ ∃𝑥𝐴 (∃𝑦𝐵 (𝜑𝜓) ∧ ∃𝑧𝐶 𝜒))
10 df-3an 1109 . 2 ((∃𝑥𝐴 𝜑 ∧ ∃𝑦𝐵 𝜓 ∧ ∃𝑧𝐶 𝜒) ↔ ((∃𝑥𝐴 𝜑 ∧ ∃𝑦𝐵 𝜓) ∧ ∃𝑧𝐶 𝜒))
114, 9, 103bitr4i 294 1 (∃𝑥𝐴𝑦𝐵𝑧𝐶 (𝜑𝜓𝜒) ↔ (∃𝑥𝐴 𝜑 ∧ ∃𝑦𝐵 𝜓 ∧ ∃𝑧𝐶 𝜒))
Colors of variables: wff setvar class
Syntax hints:  wb 197  wa 384  w3a 1107  wrex 3056
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1890  ax-4 1904  ax-5 2005  ax-6 2070  ax-7 2105  ax-10 2183  ax-11 2198  ax-12 2211
This theorem depends on definitions:  df-bi 198  df-an 385  df-or 874  df-3an 1109  df-tru 1656  df-ex 1875  df-nf 1879  df-ral 3060  df-rex 3061
This theorem is referenced by:  imasmnd2  17607  imasgrp2  17811  imasring  18900  axeuclid  26148  lshpkrlem6  35092
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