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Theorem prtlem10 33168
 Description: Lemma for prter3 33185. (Contributed by Rodolfo Medina, 14-Oct-2010.) (Revised by Mario Carneiro, 12-Aug-2015.)
Assertion
Ref Expression
prtlem10 ( Er 𝐴 → (𝑧𝐴 → (𝑧 𝑤 ↔ ∃𝑣𝐴 (𝑧 ∈ [𝑣] 𝑤 ∈ [𝑣] ))))
Distinct variable groups:   𝑤,𝑣   𝑧,𝑣   𝑣,𝐴   𝑣,
Allowed substitution hints:   𝐴(𝑧,𝑤)   (𝑧,𝑤)

Proof of Theorem prtlem10
StepHypRef Expression
1 simpr 476 . . . . 5 (( Er 𝐴𝑧𝐴) → 𝑧𝐴)
2 simpl 472 . . . . . 6 (( Er 𝐴𝑧𝐴) → Er 𝐴)
32, 1erref 7649 . . . . 5 (( Er 𝐴𝑧𝐴) → 𝑧 𝑧)
4 breq1 4586 . . . . . . . 8 (𝑣 = 𝑧 → (𝑣 𝑧𝑧 𝑧))
5 breq1 4586 . . . . . . . 8 (𝑣 = 𝑧 → (𝑣 𝑤𝑧 𝑤))
64, 5anbi12d 743 . . . . . . 7 (𝑣 = 𝑧 → ((𝑣 𝑧𝑣 𝑤) ↔ (𝑧 𝑧𝑧 𝑤)))
76rspcev 3282 . . . . . 6 ((𝑧𝐴 ∧ (𝑧 𝑧𝑧 𝑤)) → ∃𝑣𝐴 (𝑣 𝑧𝑣 𝑤))
87expr 641 . . . . 5 ((𝑧𝐴𝑧 𝑧) → (𝑧 𝑤 → ∃𝑣𝐴 (𝑣 𝑧𝑣 𝑤)))
91, 3, 8syl2anc 691 . . . 4 (( Er 𝐴𝑧𝐴) → (𝑧 𝑤 → ∃𝑣𝐴 (𝑣 𝑧𝑣 𝑤)))
10 simplll 794 . . . . . . 7 (((( Er 𝐴𝑧𝐴) ∧ 𝑣𝐴) ∧ (𝑣 𝑧𝑣 𝑤)) → Er 𝐴)
11 simprl 790 . . . . . . 7 (((( Er 𝐴𝑧𝐴) ∧ 𝑣𝐴) ∧ (𝑣 𝑧𝑣 𝑤)) → 𝑣 𝑧)
12 simprr 792 . . . . . . 7 (((( Er 𝐴𝑧𝐴) ∧ 𝑣𝐴) ∧ (𝑣 𝑧𝑣 𝑤)) → 𝑣 𝑤)
1310, 11, 12ertr3d 7647 . . . . . 6 (((( Er 𝐴𝑧𝐴) ∧ 𝑣𝐴) ∧ (𝑣 𝑧𝑣 𝑤)) → 𝑧 𝑤)
1413ex 449 . . . . 5 ((( Er 𝐴𝑧𝐴) ∧ 𝑣𝐴) → ((𝑣 𝑧𝑣 𝑤) → 𝑧 𝑤))
1514rexlimdva 3013 . . . 4 (( Er 𝐴𝑧𝐴) → (∃𝑣𝐴 (𝑣 𝑧𝑣 𝑤) → 𝑧 𝑤))
169, 15impbid 201 . . 3 (( Er 𝐴𝑧𝐴) → (𝑧 𝑤 ↔ ∃𝑣𝐴 (𝑣 𝑧𝑣 𝑤)))
17 vex 3176 . . . . . 6 𝑧 ∈ V
18 vex 3176 . . . . . 6 𝑣 ∈ V
1917, 18elec 7673 . . . . 5 (𝑧 ∈ [𝑣] 𝑣 𝑧)
20 vex 3176 . . . . . 6 𝑤 ∈ V
2120, 18elec 7673 . . . . 5 (𝑤 ∈ [𝑣] 𝑣 𝑤)
2219, 21anbi12i 729 . . . 4 ((𝑧 ∈ [𝑣] 𝑤 ∈ [𝑣] ) ↔ (𝑣 𝑧𝑣 𝑤))
2322rexbii 3023 . . 3 (∃𝑣𝐴 (𝑧 ∈ [𝑣] 𝑤 ∈ [𝑣] ) ↔ ∃𝑣𝐴 (𝑣 𝑧𝑣 𝑤))
2416, 23syl6bbr 277 . 2 (( Er 𝐴𝑧𝐴) → (𝑧 𝑤 ↔ ∃𝑣𝐴 (𝑧 ∈ [𝑣] 𝑤 ∈ [𝑣] )))
2524ex 449 1 ( Er 𝐴 → (𝑧𝐴 → (𝑧 𝑤 ↔ ∃𝑣𝐴 (𝑧 ∈ [𝑣] 𝑤 ∈ [𝑣] ))))
 Colors of variables: wff setvar class Syntax hints:   → wi 4   ↔ wb 195   ∧ wa 383   ∈ wcel 1977  ∃wrex 2897   class class class wbr 4583   Er wer 7626  [cec 7627 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1713  ax-4 1728  ax-5 1827  ax-6 1875  ax-7 1922  ax-9 1986  ax-10 2006  ax-11 2021  ax-12 2034  ax-13 2234  ax-ext 2590  ax-sep 4709  ax-nul 4717  ax-pr 4833 This theorem depends on definitions:  df-bi 196  df-or 384  df-an 385  df-3an 1033  df-tru 1478  df-ex 1696  df-nf 1701  df-sb 1868  df-eu 2462  df-mo 2463  df-clab 2597  df-cleq 2603  df-clel 2606  df-nfc 2740  df-ral 2901  df-rex 2902  df-rab 2905  df-v 3175  df-sbc 3403  df-dif 3543  df-un 3545  df-in 3547  df-ss 3554  df-nul 3875  df-if 4037  df-sn 4126  df-pr 4128  df-op 4132  df-br 4584  df-opab 4644  df-xp 5044  df-rel 5045  df-cnv 5046  df-co 5047  df-dm 5048  df-rn 5049  df-res 5050  df-ima 5051  df-er 7629  df-ec 7631 This theorem is referenced by: (None)
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