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Theorem 2reu5lem2 3718
Description: Lemma for 2reu5 3720. (Contributed by Alexander van der Vekens, 17-Jun-2017.)
Assertion
Ref Expression
2reu5lem2 (∀𝑥𝐴 ∃*𝑦𝐵 𝜑 ↔ ∀𝑥∃*𝑦(𝑥𝐴𝑦𝐵𝜑))
Distinct variable groups:   𝑦,𝐴   𝑥,𝑦
Allowed substitution hints:   𝜑(𝑥, 𝑦)   𝐴(𝑥)   𝐵(𝑥, 𝑦)

Proof of Theorem 2reu5lem2
StepHypRef Expression
1 df-rmo 3368 . . 3 (∃*𝑦𝐵 𝜑 ↔ ∃*𝑦(𝑦𝐵𝜑))
21ralbii 3110 . 2 (∀𝑥𝐴 ∃*𝑦𝐵 𝜑 ↔ ∀𝑥𝐴 ∃*𝑦(𝑦𝐵𝜑))
3 df-ral 3079 . . 3 (∀𝑥𝐴 ∃*𝑦(𝑦𝐵𝜑) ↔ ∀𝑥(𝑥𝐴 → ∃*𝑦(𝑦𝐵𝜑)))
4 moanimv 2646 . . . . . 6 (∃*𝑦(𝑥𝐴 ∧ (𝑦𝐵𝜑)) ↔ (𝑥𝐴 → ∃*𝑦(𝑦𝐵𝜑)))
54bicomi 227 . . . . 5 ((𝑥𝐴 → ∃*𝑦(𝑦𝐵𝜑)) ↔ ∃*𝑦(𝑥𝐴 ∧ (𝑦𝐵𝜑)))
6 3anass 1110 . . . . . . 7 ((𝑥𝐴𝑦𝐵𝜑) ↔ (𝑥𝐴 ∧ (𝑦𝐵𝜑)))
76bicomi 227 . . . . . 6 ((𝑥𝐴 ∧ (𝑦𝐵𝜑)) ↔ (𝑥𝐴𝑦𝐵𝜑))
87mobii 2575 . . . . 5 (∃*𝑦(𝑥𝐴 ∧ (𝑦𝐵𝜑)) ↔ ∃*𝑦(𝑥𝐴𝑦𝐵𝜑))
95, 8bitri 278 . . . 4 ((𝑥𝐴 → ∃*𝑦(𝑦𝐵𝜑)) ↔ ∃*𝑦(𝑥𝐴𝑦𝐵𝜑))
109albii 1848 . . 3 (∀𝑥(𝑥𝐴 → ∃*𝑦(𝑦𝐵𝜑)) ↔ ∀𝑥∃*𝑦(𝑥𝐴𝑦𝐵𝜑))
113, 10bitri 278 . 2 (∀𝑥𝐴 ∃*𝑦(𝑦𝐵𝜑) ↔ ∀𝑥∃*𝑦(𝑥𝐴𝑦𝐵𝜑))
122, 11bitri 278 1 (∀𝑥𝐴 ∃*𝑦𝐵 𝜑 ↔ ∀𝑥∃*𝑦(𝑥𝐴𝑦𝐵𝜑))
Colors of variables:    wff setvar class
This proof depends on syntax axioms:  wi 4  wb 209  wa 400  w3a 1102  wal 1567  wcel 2142  ∃*wmo 2564  wral 3078  ∃*wrmo 3367
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1824  ax-4 1838  ax-5 1939  ax-6 1996  ax-7 2037
This proof depends on definitions:  df-bi 210  df-an 401  df-3an 1104  df-ex 1809  df-mo 2566  df-ral 3079  df-rmo 3368
This theorem is used by:  2reu5lem3  3719
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