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Theorem ee8anv 1995
Description: Rearrange existential quantifiers. (Contributed by Jim Kingdon, 23-Nov-2019.)
Assertion
Ref Expression
ee8anv (∃𝑥∃𝑦∃𝑧∃𝑤∃𝑣∃𝑢∃𝑡∃𝑠(𝜑 ∧ 𝜓) ↔ (∃𝑥∃𝑦∃𝑧∃𝑤𝜑 ∧ ∃𝑣∃𝑢∃𝑡∃𝑠𝜓))
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 1743 . . 3 (∃𝑧∃𝑤∃𝑣∃𝑢∃𝑡∃𝑠(𝜑 ∧ 𝜓) ↔ ∃𝑣∃𝑢∃𝑧∃𝑤∃𝑡∃𝑠(𝜑 ∧ 𝜓))
212exbii 1659 . 2 (∃𝑥∃𝑦∃𝑧∃𝑤∃𝑣∃𝑢∃𝑡∃𝑠(𝜑 ∧ 𝜓) ↔ ∃𝑥∃𝑦∃𝑣∃𝑢∃𝑧∃𝑤∃𝑡∃𝑠(𝜑 ∧ 𝜓))
3 ee4anv 1994 . . . 4 (∃𝑧∃𝑤∃𝑡∃𝑠(𝜑 ∧ 𝜓) ↔ (∃𝑧∃𝑤𝜑 ∧ ∃𝑡∃𝑠𝜓))
432exbii 1659 . . 3 (∃𝑣∃𝑢∃𝑧∃𝑤∃𝑡∃𝑠(𝜑 ∧ 𝜓) ↔ ∃𝑣∃𝑢(∃𝑧∃𝑤𝜑 ∧ ∃𝑡∃𝑠𝜓))
542exbii 1659 . 2 (∃𝑥∃𝑦∃𝑣∃𝑢∃𝑧∃𝑤∃𝑡∃𝑠(𝜑 ∧ 𝜓) ↔ ∃𝑥∃𝑦∃𝑣∃𝑢(∃𝑧∃𝑤𝜑 ∧ ∃𝑡∃𝑠𝜓))
6 ee4anv 1994 . 2 (∃𝑥∃𝑦∃𝑣∃𝑢(∃𝑧∃𝑤𝜑 ∧ ∃𝑡∃𝑠𝜓) ↔ (∃𝑥∃𝑦∃𝑧∃𝑤𝜑 ∧ ∃𝑣∃𝑢∃𝑡∃𝑠𝜓))
72, 5, 63bitri 206 1 (∃𝑥∃𝑦∃𝑧∃𝑤∃𝑣∃𝑢∃𝑡∃𝑠(𝜑 ∧ 𝜓) ↔ (∃𝑥∃𝑦∃𝑧∃𝑤𝜑 ∧ ∃𝑣∃𝑢∃𝑡∃𝑠𝜓))
Colors of variables:    wff set class
This proof depends on syntax axioms:   ∧ wa 104   ↔ wb 105  ∃wex 1545
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-4 1563  ax-17 1579  ax-ial 1587
This proof depends on definitions:  df-bi 117  df-nf 1514
This theorem is used by:  enq0tr  7802
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