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Theorem ee8anv 1851
Description: Rearrange existential quantifiers. (Contributed by Jim Kingdon, 23-Nov-2019.)
Assertion
Ref Expression
ee8anv (∃𝑥𝑦𝑧𝑤𝑣𝑢𝑡𝑠(𝜑𝜓) ↔ (∃𝑥𝑦𝑧𝑤𝜑 ∧ ∃𝑣𝑢𝑡𝑠𝜓))
Distinct variable groups:   𝜑,𝑣   𝜑,𝑢   𝜑,𝑡   𝜑,𝑠   𝜓,𝑥   𝜓,𝑦   𝜓,𝑧   𝜓,𝑤   𝑥,𝑠   𝑦,𝑠   𝑧,𝑠   𝑤,𝑡   𝑥,𝑡   𝑦,𝑡   𝑤,𝑢   𝑥,𝑢   𝑧,𝑢   𝑤,𝑣   𝑦,𝑣   𝑧,𝑣
Allowed substitution hints:   𝜑(𝑥,𝑦,𝑧,𝑤)   𝜓(𝑣,𝑢,𝑡,𝑠)

Proof of Theorem ee8anv
StepHypRef Expression
1 exrot4 1621 . . 3 (∃𝑧𝑤𝑣𝑢𝑡𝑠(𝜑𝜓) ↔ ∃𝑣𝑢𝑧𝑤𝑡𝑠(𝜑𝜓))
212exbii 1537 . 2 (∃𝑥𝑦𝑧𝑤𝑣𝑢𝑡𝑠(𝜑𝜓) ↔ ∃𝑥𝑦𝑣𝑢𝑧𝑤𝑡𝑠(𝜑𝜓))
3 ee4anv 1850 . . . 4 (∃𝑧𝑤𝑡𝑠(𝜑𝜓) ↔ (∃𝑧𝑤𝜑 ∧ ∃𝑡𝑠𝜓))
432exbii 1537 . . 3 (∃𝑣𝑢𝑧𝑤𝑡𝑠(𝜑𝜓) ↔ ∃𝑣𝑢(∃𝑧𝑤𝜑 ∧ ∃𝑡𝑠𝜓))
542exbii 1537 . 2 (∃𝑥𝑦𝑣𝑢𝑧𝑤𝑡𝑠(𝜑𝜓) ↔ ∃𝑥𝑦𝑣𝑢(∃𝑧𝑤𝜑 ∧ ∃𝑡𝑠𝜓))
6 ee4anv 1850 . 2 (∃𝑥𝑦𝑣𝑢(∃𝑧𝑤𝜑 ∧ ∃𝑡𝑠𝜓) ↔ (∃𝑥𝑦𝑧𝑤𝜑 ∧ ∃𝑣𝑢𝑡𝑠𝜓))
72, 5, 63bitri 204 1 (∃𝑥𝑦𝑧𝑤𝑣𝑢𝑡𝑠(𝜑𝜓) ↔ (∃𝑥𝑦𝑧𝑤𝜑 ∧ ∃𝑣𝑢𝑡𝑠𝜓))
Colors of variables: wff set class
Syntax hints:  wa 102  wb 103  wex 1421
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 104  ax-ia2 105  ax-ia3 106  ax-5 1376  ax-7 1377  ax-gen 1378  ax-ie1 1422  ax-ie2 1423  ax-4 1440  ax-17 1459  ax-ial 1467
This theorem depends on definitions:  df-bi 115  df-nf 1390
This theorem is referenced by:  enq0tr  6624
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