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Theorem r19.41vv 3305
 Description: Version of r19.41v 3303 with two quantifiers. (Contributed by Thierry Arnoux, 25-Jan-2017.)
Assertion
Ref Expression
r19.41vv (∃𝑥𝐴𝑦𝐵 (𝜑𝜓) ↔ (∃𝑥𝐴𝑦𝐵 𝜑𝜓))
Distinct variable groups:   𝜓,𝑥   𝜓,𝑦
Allowed substitution hints:   𝜑(𝑥,𝑦)   𝐴(𝑥,𝑦)   𝐵(𝑥,𝑦)

Proof of Theorem r19.41vv
StepHypRef Expression
1 r19.41v 3303 . . 3 (∃𝑦𝐵 (𝜑𝜓) ↔ (∃𝑦𝐵 𝜑𝜓))
21rexbii 3213 . 2 (∃𝑥𝐴𝑦𝐵 (𝜑𝜓) ↔ ∃𝑥𝐴 (∃𝑦𝐵 𝜑𝜓))
3 r19.41v 3303 . 2 (∃𝑥𝐴 (∃𝑦𝐵 𝜑𝜓) ↔ (∃𝑥𝐴𝑦𝐵 𝜑𝜓))
42, 3bitri 278 1 (∃𝑥𝐴𝑦𝐵 (𝜑𝜓) ↔ (∃𝑥𝐴𝑦𝐵 𝜑𝜓))
 Colors of variables: wff setvar class Syntax hints:   ↔ wb 209   ∧ wa 399  ∃wrex 3110 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1911 This theorem depends on definitions:  df-bi 210  df-an 400  df-ex 1782  df-rex 3115 This theorem is referenced by:  genpass  10424  dfcgra2  26627  axeuclid  26760  wspthsnwspthsnon  27705  dya2iocnrect  31647  satfv0  32713  satfv1  32718  satf0  32727  itg2addnclem3  35103  prprelprb  44021  prprspr2  44022
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