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Theorem oeeulem 8205
 Description: Lemma for oeeu 8207. (Contributed by Mario Carneiro, 28-Feb-2013.)
Hypothesis
Ref Expression
oeeu.1 𝑋 = {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)}
Assertion
Ref Expression
oeeulem ((𝐴 ∈ (On ∖ 2o) ∧ 𝐵 ∈ (On ∖ 1o)) → (𝑋 ∈ On ∧ (𝐴o 𝑋) ⊆ 𝐵𝐵 ∈ (𝐴o suc 𝑋)))
Distinct variable groups:   𝑥,𝐴   𝑥,𝐵
Allowed substitution hint:   𝑋(𝑥)

Proof of Theorem oeeulem
Dummy variable 𝑦 is distinct from all other variables.
StepHypRef Expression
1 oeeu.1 . . 3 𝑋 = {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)}
2 eldifi 4082 . . . . . . . 8 (𝐵 ∈ (On ∖ 1o) → 𝐵 ∈ On)
32adantl 484 . . . . . . 7 ((𝐴 ∈ (On ∖ 2o) ∧ 𝐵 ∈ (On ∖ 1o)) → 𝐵 ∈ On)
4 suceloni 7506 . . . . . . 7 (𝐵 ∈ On → suc 𝐵 ∈ On)
53, 4syl 17 . . . . . 6 ((𝐴 ∈ (On ∖ 2o) ∧ 𝐵 ∈ (On ∖ 1o)) → suc 𝐵 ∈ On)
6 oeworde 8197 . . . . . . . 8 ((𝐴 ∈ (On ∖ 2o) ∧ suc 𝐵 ∈ On) → suc 𝐵 ⊆ (𝐴o suc 𝐵))
75, 6syldan 593 . . . . . . 7 ((𝐴 ∈ (On ∖ 2o) ∧ 𝐵 ∈ (On ∖ 1o)) → suc 𝐵 ⊆ (𝐴o suc 𝐵))
8 sucidg 6245 . . . . . . . 8 (𝐵 ∈ On → 𝐵 ∈ suc 𝐵)
93, 8syl 17 . . . . . . 7 ((𝐴 ∈ (On ∖ 2o) ∧ 𝐵 ∈ (On ∖ 1o)) → 𝐵 ∈ suc 𝐵)
107, 9sseldd 3947 . . . . . 6 ((𝐴 ∈ (On ∖ 2o) ∧ 𝐵 ∈ (On ∖ 1o)) → 𝐵 ∈ (𝐴o suc 𝐵))
11 oveq2 7141 . . . . . . . 8 (𝑥 = suc 𝐵 → (𝐴o 𝑥) = (𝐴o suc 𝐵))
1211eleq2d 2896 . . . . . . 7 (𝑥 = suc 𝐵 → (𝐵 ∈ (𝐴o 𝑥) ↔ 𝐵 ∈ (𝐴o suc 𝐵)))
1312rspcev 3602 . . . . . 6 ((suc 𝐵 ∈ On ∧ 𝐵 ∈ (𝐴o suc 𝐵)) → ∃𝑥 ∈ On 𝐵 ∈ (𝐴o 𝑥))
145, 10, 13syl2anc 586 . . . . 5 ((𝐴 ∈ (On ∖ 2o) ∧ 𝐵 ∈ (On ∖ 1o)) → ∃𝑥 ∈ On 𝐵 ∈ (𝐴o 𝑥))
15 onintrab2 7495 . . . . 5 (∃𝑥 ∈ On 𝐵 ∈ (𝐴o 𝑥) ↔ {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)} ∈ On)
1614, 15sylib 220 . . . 4 ((𝐴 ∈ (On ∖ 2o) ∧ 𝐵 ∈ (On ∖ 1o)) → {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)} ∈ On)
17 onuni 7486 . . . 4 ( {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)} ∈ On → {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)} ∈ On)
1816, 17syl 17 . . 3 ((𝐴 ∈ (On ∖ 2o) ∧ 𝐵 ∈ (On ∖ 1o)) → {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)} ∈ On)
191, 18eqeltrid 2915 . 2 ((𝐴 ∈ (On ∖ 2o) ∧ 𝐵 ∈ (On ∖ 1o)) → 𝑋 ∈ On)
20 sucidg 6245 . . . . . . 7 (𝑋 ∈ On → 𝑋 ∈ suc 𝑋)
2119, 20syl 17 . . . . . 6 ((𝐴 ∈ (On ∖ 2o) ∧ 𝐵 ∈ (On ∖ 1o)) → 𝑋 ∈ suc 𝑋)
22 dif1o 8103 . . . . . . . . . . . . 13 (𝐵 ∈ (On ∖ 1o) ↔ (𝐵 ∈ On ∧ 𝐵 ≠ ∅))
2322simprbi 499 . . . . . . . . . . . 12 (𝐵 ∈ (On ∖ 1o) → 𝐵 ≠ ∅)
2423adantl 484 . . . . . . . . . . 11 ((𝐴 ∈ (On ∖ 2o) ∧ 𝐵 ∈ (On ∖ 1o)) → 𝐵 ≠ ∅)
25 ssrab2 4035 . . . . . . . . . . . . . . 15 {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)} ⊆ On
26 rabn0 4315 . . . . . . . . . . . . . . . 16 ({𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)} ≠ ∅ ↔ ∃𝑥 ∈ On 𝐵 ∈ (𝐴o 𝑥))
2714, 26sylibr 236 . . . . . . . . . . . . . . 15 ((𝐴 ∈ (On ∖ 2o) ∧ 𝐵 ∈ (On ∖ 1o)) → {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)} ≠ ∅)
28 onint 7488 . . . . . . . . . . . . . . 15 (({𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)} ⊆ On ∧ {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)} ≠ ∅) → {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)} ∈ {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)})
2925, 27, 28sylancr 589 . . . . . . . . . . . . . 14 ((𝐴 ∈ (On ∖ 2o) ∧ 𝐵 ∈ (On ∖ 1o)) → {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)} ∈ {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)})
30 eleq1 2898 . . . . . . . . . . . . . 14 ( {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)} = ∅ → ( {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)} ∈ {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)} ↔ ∅ ∈ {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)}))
3129, 30syl5ibcom 247 . . . . . . . . . . . . 13 ((𝐴 ∈ (On ∖ 2o) ∧ 𝐵 ∈ (On ∖ 1o)) → ( {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)} = ∅ → ∅ ∈ {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)}))
32 oveq2 7141 . . . . . . . . . . . . . . . . 17 (𝑥 = ∅ → (𝐴o 𝑥) = (𝐴o ∅))
3332eleq2d 2896 . . . . . . . . . . . . . . . 16 (𝑥 = ∅ → (𝐵 ∈ (𝐴o 𝑥) ↔ 𝐵 ∈ (𝐴o ∅)))
3433elrab 3660 . . . . . . . . . . . . . . 15 (∅ ∈ {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)} ↔ (∅ ∈ On ∧ 𝐵 ∈ (𝐴o ∅)))
3534simprbi 499 . . . . . . . . . . . . . 14 (∅ ∈ {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)} → 𝐵 ∈ (𝐴o ∅))
36 eldifi 4082 . . . . . . . . . . . . . . . . . 18 (𝐴 ∈ (On ∖ 2o) → 𝐴 ∈ On)
3736adantr 483 . . . . . . . . . . . . . . . . 17 ((𝐴 ∈ (On ∖ 2o) ∧ 𝐵 ∈ (On ∖ 1o)) → 𝐴 ∈ On)
38 oe0 8125 . . . . . . . . . . . . . . . . 17 (𝐴 ∈ On → (𝐴o ∅) = 1o)
3937, 38syl 17 . . . . . . . . . . . . . . . 16 ((𝐴 ∈ (On ∖ 2o) ∧ 𝐵 ∈ (On ∖ 1o)) → (𝐴o ∅) = 1o)
4039eleq2d 2896 . . . . . . . . . . . . . . 15 ((𝐴 ∈ (On ∖ 2o) ∧ 𝐵 ∈ (On ∖ 1o)) → (𝐵 ∈ (𝐴o ∅) ↔ 𝐵 ∈ 1o))
41 el1o 8102 . . . . . . . . . . . . . . 15 (𝐵 ∈ 1o𝐵 = ∅)
4240, 41syl6bb 289 . . . . . . . . . . . . . 14 ((𝐴 ∈ (On ∖ 2o) ∧ 𝐵 ∈ (On ∖ 1o)) → (𝐵 ∈ (𝐴o ∅) ↔ 𝐵 = ∅))
4335, 42syl5ib 246 . . . . . . . . . . . . 13 ((𝐴 ∈ (On ∖ 2o) ∧ 𝐵 ∈ (On ∖ 1o)) → (∅ ∈ {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)} → 𝐵 = ∅))
4431, 43syld 47 . . . . . . . . . . . 12 ((𝐴 ∈ (On ∖ 2o) ∧ 𝐵 ∈ (On ∖ 1o)) → ( {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)} = ∅ → 𝐵 = ∅))
4544necon3ad 3019 . . . . . . . . . . 11 ((𝐴 ∈ (On ∖ 2o) ∧ 𝐵 ∈ (On ∖ 1o)) → (𝐵 ≠ ∅ → ¬ {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)} = ∅))
4624, 45mpd 15 . . . . . . . . . 10 ((𝐴 ∈ (On ∖ 2o) ∧ 𝐵 ∈ (On ∖ 1o)) → ¬ {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)} = ∅)
47 limuni 6227 . . . . . . . . . . . . . . . . 17 (Lim {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)} → {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)} = {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)})
4847, 1syl6eqr 2873 . . . . . . . . . . . . . . . 16 (Lim {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)} → {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)} = 𝑋)
4948adantl 484 . . . . . . . . . . . . . . 15 (((𝐴 ∈ (On ∖ 2o) ∧ 𝐵 ∈ (On ∖ 1o)) ∧ Lim {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)}) → {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)} = 𝑋)
5029adantr 483 . . . . . . . . . . . . . . 15 (((𝐴 ∈ (On ∖ 2o) ∧ 𝐵 ∈ (On ∖ 1o)) ∧ Lim {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)}) → {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)} ∈ {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)})
5149, 50eqeltrrd 2912 . . . . . . . . . . . . . 14 (((𝐴 ∈ (On ∖ 2o) ∧ 𝐵 ∈ (On ∖ 1o)) ∧ Lim {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)}) → 𝑋 ∈ {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)})
52 oveq2 7141 . . . . . . . . . . . . . . . . 17 (𝑦 = 𝑋 → (𝐴o 𝑦) = (𝐴o 𝑋))
5352eleq2d 2896 . . . . . . . . . . . . . . . 16 (𝑦 = 𝑋 → (𝐵 ∈ (𝐴o 𝑦) ↔ 𝐵 ∈ (𝐴o 𝑋)))
54 oveq2 7141 . . . . . . . . . . . . . . . . . 18 (𝑥 = 𝑦 → (𝐴o 𝑥) = (𝐴o 𝑦))
5554eleq2d 2896 . . . . . . . . . . . . . . . . 17 (𝑥 = 𝑦 → (𝐵 ∈ (𝐴o 𝑥) ↔ 𝐵 ∈ (𝐴o 𝑦)))
5655cbvrabv 3470 . . . . . . . . . . . . . . . 16 {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)} = {𝑦 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑦)}
5753, 56elrab2 3663 . . . . . . . . . . . . . . 15 (𝑋 ∈ {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)} ↔ (𝑋 ∈ On ∧ 𝐵 ∈ (𝐴o 𝑋)))
5857simprbi 499 . . . . . . . . . . . . . 14 (𝑋 ∈ {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)} → 𝐵 ∈ (𝐴o 𝑋))
5951, 58syl 17 . . . . . . . . . . . . 13 (((𝐴 ∈ (On ∖ 2o) ∧ 𝐵 ∈ (On ∖ 1o)) ∧ Lim {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)}) → 𝐵 ∈ (𝐴o 𝑋))
6036ad2antrr 724 . . . . . . . . . . . . . 14 (((𝐴 ∈ (On ∖ 2o) ∧ 𝐵 ∈ (On ∖ 1o)) ∧ Lim {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)}) → 𝐴 ∈ On)
61 limeq 6179 . . . . . . . . . . . . . . . . 17 ( {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)} = 𝑋 → (Lim {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)} ↔ Lim 𝑋))
6248, 61syl 17 . . . . . . . . . . . . . . . 16 (Lim {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)} → (Lim {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)} ↔ Lim 𝑋))
6362ibi 269 . . . . . . . . . . . . . . 15 (Lim {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)} → Lim 𝑋)
6419, 63anim12i 614 . . . . . . . . . . . . . 14 (((𝐴 ∈ (On ∖ 2o) ∧ 𝐵 ∈ (On ∖ 1o)) ∧ Lim {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)}) → (𝑋 ∈ On ∧ Lim 𝑋))
65 dif20el 8108 . . . . . . . . . . . . . . 15 (𝐴 ∈ (On ∖ 2o) → ∅ ∈ 𝐴)
6665ad2antrr 724 . . . . . . . . . . . . . 14 (((𝐴 ∈ (On ∖ 2o) ∧ 𝐵 ∈ (On ∖ 1o)) ∧ Lim {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)}) → ∅ ∈ 𝐴)
67 oelim 8137 . . . . . . . . . . . . . 14 (((𝐴 ∈ On ∧ (𝑋 ∈ On ∧ Lim 𝑋)) ∧ ∅ ∈ 𝐴) → (𝐴o 𝑋) = 𝑦𝑋 (𝐴o 𝑦))
6860, 64, 66, 67syl21anc 835 . . . . . . . . . . . . 13 (((𝐴 ∈ (On ∖ 2o) ∧ 𝐵 ∈ (On ∖ 1o)) ∧ Lim {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)}) → (𝐴o 𝑋) = 𝑦𝑋 (𝐴o 𝑦))
6959, 68eleqtrd 2913 . . . . . . . . . . . 12 (((𝐴 ∈ (On ∖ 2o) ∧ 𝐵 ∈ (On ∖ 1o)) ∧ Lim {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)}) → 𝐵 𝑦𝑋 (𝐴o 𝑦))
70 eliun 4899 . . . . . . . . . . . 12 (𝐵 𝑦𝑋 (𝐴o 𝑦) ↔ ∃𝑦𝑋 𝐵 ∈ (𝐴o 𝑦))
7169, 70sylib 220 . . . . . . . . . . 11 (((𝐴 ∈ (On ∖ 2o) ∧ 𝐵 ∈ (On ∖ 1o)) ∧ Lim {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)}) → ∃𝑦𝑋 𝐵 ∈ (𝐴o 𝑦))
7219adantr 483 . . . . . . . . . . . . . . 15 (((𝐴 ∈ (On ∖ 2o) ∧ 𝐵 ∈ (On ∖ 1o)) ∧ Lim {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)}) → 𝑋 ∈ On)
73 onss 7483 . . . . . . . . . . . . . . 15 (𝑋 ∈ On → 𝑋 ⊆ On)
7472, 73syl 17 . . . . . . . . . . . . . 14 (((𝐴 ∈ (On ∖ 2o) ∧ 𝐵 ∈ (On ∖ 1o)) ∧ Lim {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)}) → 𝑋 ⊆ On)
7574sselda 3946 . . . . . . . . . . . . 13 ((((𝐴 ∈ (On ∖ 2o) ∧ 𝐵 ∈ (On ∖ 1o)) ∧ Lim {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)}) ∧ 𝑦𝑋) → 𝑦 ∈ On)
7649eleq2d 2896 . . . . . . . . . . . . . 14 (((𝐴 ∈ (On ∖ 2o) ∧ 𝐵 ∈ (On ∖ 1o)) ∧ Lim {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)}) → (𝑦 {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)} ↔ 𝑦𝑋))
7776biimpar 480 . . . . . . . . . . . . 13 ((((𝐴 ∈ (On ∖ 2o) ∧ 𝐵 ∈ (On ∖ 1o)) ∧ Lim {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)}) ∧ 𝑦𝑋) → 𝑦 {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)})
7855onnminsb 7497 . . . . . . . . . . . . 13 (𝑦 ∈ On → (𝑦 {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)} → ¬ 𝐵 ∈ (𝐴o 𝑦)))
7975, 77, 78sylc 65 . . . . . . . . . . . 12 ((((𝐴 ∈ (On ∖ 2o) ∧ 𝐵 ∈ (On ∖ 1o)) ∧ Lim {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)}) ∧ 𝑦𝑋) → ¬ 𝐵 ∈ (𝐴o 𝑦))
8079nrexdv 3257 . . . . . . . . . . 11 (((𝐴 ∈ (On ∖ 2o) ∧ 𝐵 ∈ (On ∖ 1o)) ∧ Lim {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)}) → ¬ ∃𝑦𝑋 𝐵 ∈ (𝐴o 𝑦))
8171, 80pm2.65da 815 . . . . . . . . . 10 ((𝐴 ∈ (On ∖ 2o) ∧ 𝐵 ∈ (On ∖ 1o)) → ¬ Lim {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)})
82 ioran 980 . . . . . . . . . 10 (¬ ( {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)} = ∅ ∨ Lim {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)}) ↔ (¬ {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)} = ∅ ∧ ¬ Lim {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)}))
8346, 81, 82sylanbrc 585 . . . . . . . . 9 ((𝐴 ∈ (On ∖ 2o) ∧ 𝐵 ∈ (On ∖ 1o)) → ¬ ( {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)} = ∅ ∨ Lim {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)}))
84 eloni 6177 . . . . . . . . . 10 ( {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)} ∈ On → Ord {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)})
85 unizlim 6283 . . . . . . . . . 10 (Ord {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)} → ( {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)} = {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)} ↔ ( {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)} = ∅ ∨ Lim {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)})))
8616, 84, 853syl 18 . . . . . . . . 9 ((𝐴 ∈ (On ∖ 2o) ∧ 𝐵 ∈ (On ∖ 1o)) → ( {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)} = {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)} ↔ ( {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)} = ∅ ∨ Lim {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)})))
8783, 86mtbird 327 . . . . . . . 8 ((𝐴 ∈ (On ∖ 2o) ∧ 𝐵 ∈ (On ∖ 1o)) → ¬ {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)} = {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)})
88 orduniorsuc 7523 . . . . . . . . . 10 (Ord {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)} → ( {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)} = {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)} ∨ {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)} = suc {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)}))
8916, 84, 883syl 18 . . . . . . . . 9 ((𝐴 ∈ (On ∖ 2o) ∧ 𝐵 ∈ (On ∖ 1o)) → ( {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)} = {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)} ∨ {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)} = suc {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)}))
9089ord 860 . . . . . . . 8 ((𝐴 ∈ (On ∖ 2o) ∧ 𝐵 ∈ (On ∖ 1o)) → (¬ {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)} = {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)} → {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)} = suc {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)}))
9187, 90mpd 15 . . . . . . 7 ((𝐴 ∈ (On ∖ 2o) ∧ 𝐵 ∈ (On ∖ 1o)) → {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)} = suc {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)})
92 suceq 6232 . . . . . . . 8 (𝑋 = {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)} → suc 𝑋 = suc {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)})
931, 92ax-mp 5 . . . . . . 7 suc 𝑋 = suc {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)}
9491, 93syl6reqr 2874 . . . . . 6 ((𝐴 ∈ (On ∖ 2o) ∧ 𝐵 ∈ (On ∖ 1o)) → suc 𝑋 = {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)})
9521, 94eleqtrd 2913 . . . . 5 ((𝐴 ∈ (On ∖ 2o) ∧ 𝐵 ∈ (On ∖ 1o)) → 𝑋 {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)})
9656inteqi 4856 . . . . 5 {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)} = {𝑦 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑦)}
9795, 96eleqtrdi 2921 . . . 4 ((𝐴 ∈ (On ∖ 2o) ∧ 𝐵 ∈ (On ∖ 1o)) → 𝑋 {𝑦 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑦)})
9853onnminsb 7497 . . . 4 (𝑋 ∈ On → (𝑋 {𝑦 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑦)} → ¬ 𝐵 ∈ (𝐴o 𝑋)))
9919, 97, 98sylc 65 . . 3 ((𝐴 ∈ (On ∖ 2o) ∧ 𝐵 ∈ (On ∖ 1o)) → ¬ 𝐵 ∈ (𝐴o 𝑋))
100 oecl 8140 . . . . 5 ((𝐴 ∈ On ∧ 𝑋 ∈ On) → (𝐴o 𝑋) ∈ On)
10137, 19, 100syl2anc 586 . . . 4 ((𝐴 ∈ (On ∖ 2o) ∧ 𝐵 ∈ (On ∖ 1o)) → (𝐴o 𝑋) ∈ On)
102 ontri1 6201 . . . 4 (((𝐴o 𝑋) ∈ On ∧ 𝐵 ∈ On) → ((𝐴o 𝑋) ⊆ 𝐵 ↔ ¬ 𝐵 ∈ (𝐴o 𝑋)))
103101, 3, 102syl2anc 586 . . 3 ((𝐴 ∈ (On ∖ 2o) ∧ 𝐵 ∈ (On ∖ 1o)) → ((𝐴o 𝑋) ⊆ 𝐵 ↔ ¬ 𝐵 ∈ (𝐴o 𝑋)))
10499, 103mpbird 259 . 2 ((𝐴 ∈ (On ∖ 2o) ∧ 𝐵 ∈ (On ∖ 1o)) → (𝐴o 𝑋) ⊆ 𝐵)
10594, 29eqeltrd 2911 . . 3 ((𝐴 ∈ (On ∖ 2o) ∧ 𝐵 ∈ (On ∖ 1o)) → suc 𝑋 ∈ {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)})
106 oveq2 7141 . . . . . 6 (𝑦 = suc 𝑋 → (𝐴o 𝑦) = (𝐴o suc 𝑋))
107106eleq2d 2896 . . . . 5 (𝑦 = suc 𝑋 → (𝐵 ∈ (𝐴o 𝑦) ↔ 𝐵 ∈ (𝐴o suc 𝑋)))
108107, 56elrab2 3663 . . . 4 (suc 𝑋 ∈ {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)} ↔ (suc 𝑋 ∈ On ∧ 𝐵 ∈ (𝐴o suc 𝑋)))
109108simprbi 499 . . 3 (suc 𝑋 ∈ {𝑥 ∈ On ∣ 𝐵 ∈ (𝐴o 𝑥)} → 𝐵 ∈ (𝐴o suc 𝑋))
110105, 109syl 17 . 2 ((𝐴 ∈ (On ∖ 2o) ∧ 𝐵 ∈ (On ∖ 1o)) → 𝐵 ∈ (𝐴o suc 𝑋))
11119, 104, 1103jca 1124 1 ((𝐴 ∈ (On ∖ 2o) ∧ 𝐵 ∈ (On ∖ 1o)) → (𝑋 ∈ On ∧ (𝐴o 𝑋) ⊆ 𝐵𝐵 ∈ (𝐴o suc 𝑋)))
 Colors of variables: wff setvar class Syntax hints:  ¬ wn 3   → wi 4   ↔ wb 208   ∧ wa 398   ∨ wo 843   ∧ w3a 1083   = wceq 1537   ∈ wcel 2114   ≠ wne 3006  ∃wrex 3126  {crab 3129   ∖ cdif 3910   ⊆ wss 3913  ∅c0 4269  ∪ cuni 4814  ∩ cint 4852  ∪ ciun 4895  Ord word 6166  Oncon0 6167  Lim wlim 6168  suc csuc 6169  (class class class)co 7133  1oc1o 8073  2oc2o 8074   ↑o coe 8079 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1970  ax-7 2015  ax-8 2116  ax-9 2124  ax-10 2145  ax-11 2161  ax-12 2177  ax-ext 2792  ax-rep 5166  ax-sep 5179  ax-nul 5186  ax-pow 5242  ax-pr 5306  ax-un 7439 This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3or 1084  df-3an 1085  df-tru 1540  df-ex 1781  df-nf 1785  df-sb 2070  df-mo 2622  df-eu 2653  df-clab 2799  df-cleq 2813  df-clel 2891  df-nfc 2959  df-ne 3007  df-ral 3130  df-rex 3131  df-reu 3132  df-rab 3134  df-v 3475  df-sbc 3753  df-csb 3861  df-dif 3916  df-un 3918  df-in 3920  df-ss 3930  df-pss 3932  df-nul 4270  df-if 4444  df-pw 4517  df-sn 4544  df-pr 4546  df-tp 4548  df-op 4550  df-uni 4815  df-int 4853  df-iun 4897  df-br 5043  df-opab 5105  df-mpt 5123  df-tr 5149  df-id 5436  df-eprel 5441  df-po 5450  df-so 5451  df-fr 5490  df-we 5492  df-xp 5537  df-rel 5538  df-cnv 5539  df-co 5540  df-dm 5541  df-rn 5542  df-res 5543  df-ima 5544  df-pred 6124  df-ord 6170  df-on 6171  df-lim 6172  df-suc 6173  df-iota 6290  df-fun 6333  df-fn 6334  df-f 6335  df-f1 6336  df-fo 6337  df-f1o 6338  df-fv 6339  df-ov 7136  df-oprab 7137  df-mpo 7138  df-om 7559  df-wrecs 7925  df-recs 7986  df-rdg 8024  df-1o 8080  df-2o 8081  df-oadd 8084  df-omul 8085  df-oexp 8086 This theorem is referenced by:  oeeui  8206  oeeu  8207
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