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Theorem on3ind 33829
Description: Triple induction over ordinals. (Contributed by Scott Fenton, 4-Sep-2024.)
Hypotheses
Ref Expression
on3ind.1 (𝑎 = 𝑑 → (𝜑𝜓))
on3ind.2 (𝑏 = 𝑒 → (𝜓𝜒))
on3ind.3 (𝑐 = 𝑓 → (𝜒𝜃))
on3ind.4 (𝑎 = 𝑑 → (𝜏𝜃))
on3ind.5 (𝑏 = 𝑒 → (𝜂𝜏))
on3ind.6 (𝑏 = 𝑒 → (𝜁𝜃))
on3ind.7 (𝑐 = 𝑓 → (𝜎𝜏))
on3ind.8 (𝑎 = 𝑋 → (𝜑𝜌))
on3ind.9 (𝑏 = 𝑌 → (𝜌𝜇))
on3ind.10 (𝑐 = 𝑍 → (𝜇𝜆))
on3ind.i ((𝑎 ∈ On ∧ 𝑏 ∈ On ∧ 𝑐 ∈ On) → (((∀𝑑𝑎𝑒𝑏𝑓𝑐 𝜃 ∧ ∀𝑑𝑎𝑒𝑏 𝜒 ∧ ∀𝑑𝑎𝑓𝑐 𝜁) ∧ (∀𝑑𝑎 𝜓 ∧ ∀𝑒𝑏𝑓𝑐 𝜏 ∧ ∀𝑒𝑏 𝜎) ∧ ∀𝑓𝑐 𝜂) → 𝜑))
Assertion
Ref Expression
on3ind ((𝑋 ∈ On ∧ 𝑌 ∈ On ∧ 𝑍 ∈ On) → 𝜆)
Distinct variable groups:   𝑎,𝑏,𝑐,𝑑,𝑒,𝑓   𝜓,𝑎   𝜌,𝑎   𝜃,𝑎   𝑏,𝑐   𝜒,𝑏   𝑏,𝑑,𝑒,𝑓   𝜇,𝑏   𝜃,𝑏   𝑐,𝑑,𝑒,𝑓   𝜆,𝑐   𝜃,𝑐   𝜒,𝑓   𝑒,𝑑,𝑓   𝜑,𝑑   𝜏,𝑑   𝜂,𝑒   𝑒,𝑓   𝜓,𝑒   𝜁,𝑒   𝜎,𝑓   𝑋,𝑎,𝑏,𝑐   𝑌,𝑏,𝑐   𝑍,𝑐
Allowed substitution hints:   𝜑(𝑒,𝑓,𝑎,𝑏,𝑐)   𝜓(𝑓,𝑏,𝑐,𝑑)   𝜒(𝑒,𝑎,𝑐,𝑑)   𝜃(𝑒,𝑓,𝑑)   𝜏(𝑒,𝑓,𝑎,𝑏,𝑐)   𝜂(𝑓,𝑎,𝑏,𝑐,𝑑)   𝜁(𝑓,𝑎,𝑏,𝑐,𝑑)   𝜎(𝑒,𝑎,𝑏,𝑐,𝑑)   𝜌(𝑒,𝑓,𝑏,𝑐,𝑑)   𝜇(𝑒,𝑓,𝑎,𝑐,𝑑)   𝜆(𝑒,𝑓,𝑎,𝑏,𝑑)   𝑋(𝑒,𝑓,𝑑)   𝑌(𝑒,𝑓,𝑎,𝑑)   𝑍(𝑒,𝑓,𝑎,𝑏,𝑑)

Proof of Theorem on3ind
Dummy variables 𝑥 𝑦 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 eqid 2738 . 2 {⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ ((On × On) × On) ∧ 𝑦 ∈ ((On × On) × On) ∧ ((((1st ‘(1st𝑥)) E (1st ‘(1st𝑦)) ∨ (1st ‘(1st𝑥)) = (1st ‘(1st𝑦))) ∧ ((2nd ‘(1st𝑥)) E (2nd ‘(1st𝑦)) ∨ (2nd ‘(1st𝑥)) = (2nd ‘(1st𝑦))) ∧ ((2nd𝑥) E (2nd𝑦) ∨ (2nd𝑥) = (2nd𝑦))) ∧ 𝑥𝑦))} = {⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ ((On × On) × On) ∧ 𝑦 ∈ ((On × On) × On) ∧ ((((1st ‘(1st𝑥)) E (1st ‘(1st𝑦)) ∨ (1st ‘(1st𝑥)) = (1st ‘(1st𝑦))) ∧ ((2nd ‘(1st𝑥)) E (2nd ‘(1st𝑦)) ∨ (2nd ‘(1st𝑥)) = (2nd ‘(1st𝑦))) ∧ ((2nd𝑥) E (2nd𝑦) ∨ (2nd𝑥) = (2nd𝑦))) ∧ 𝑥𝑦))}
2 onfr 6305 . 2 E Fr On
3 epweon 7625 . . 3 E We On
4 weso 5580 . . 3 ( E We On → E Or On)
5 sopo 5522 . . 3 ( E Or On → E Po On)
63, 4, 5mp2b 10 . 2 E Po On
7 epse 5572 . 2 E Se On
8 on3ind.1 . 2 (𝑎 = 𝑑 → (𝜑𝜓))
9 on3ind.2 . 2 (𝑏 = 𝑒 → (𝜓𝜒))
10 on3ind.3 . 2 (𝑐 = 𝑓 → (𝜒𝜃))
11 on3ind.4 . 2 (𝑎 = 𝑑 → (𝜏𝜃))
12 on3ind.5 . 2 (𝑏 = 𝑒 → (𝜂𝜏))
13 on3ind.6 . 2 (𝑏 = 𝑒 → (𝜁𝜃))
14 on3ind.7 . 2 (𝑐 = 𝑓 → (𝜎𝜏))
15 on3ind.8 . 2 (𝑎 = 𝑋 → (𝜑𝜌))
16 on3ind.9 . 2 (𝑏 = 𝑌 → (𝜌𝜇))
17 on3ind.10 . 2 (𝑐 = 𝑍 → (𝜇𝜆))
18 predon 7635 . . . . . . 7 (𝑎 ∈ On → Pred( E , On, 𝑎) = 𝑎)
19183ad2ant1 1132 . . . . . 6 ((𝑎 ∈ On ∧ 𝑏 ∈ On ∧ 𝑐 ∈ On) → Pred( E , On, 𝑎) = 𝑎)
20 predon 7635 . . . . . . . 8 (𝑏 ∈ On → Pred( E , On, 𝑏) = 𝑏)
21203ad2ant2 1133 . . . . . . 7 ((𝑎 ∈ On ∧ 𝑏 ∈ On ∧ 𝑐 ∈ On) → Pred( E , On, 𝑏) = 𝑏)
22 predon 7635 . . . . . . . . 9 (𝑐 ∈ On → Pred( E , On, 𝑐) = 𝑐)
23223ad2ant3 1134 . . . . . . . 8 ((𝑎 ∈ On ∧ 𝑏 ∈ On ∧ 𝑐 ∈ On) → Pred( E , On, 𝑐) = 𝑐)
2423raleqdv 3348 . . . . . . 7 ((𝑎 ∈ On ∧ 𝑏 ∈ On ∧ 𝑐 ∈ On) → (∀𝑓 ∈ Pred ( E , On, 𝑐)𝜃 ↔ ∀𝑓𝑐 𝜃))
2521, 24raleqbidv 3336 . . . . . 6 ((𝑎 ∈ On ∧ 𝑏 ∈ On ∧ 𝑐 ∈ On) → (∀𝑒 ∈ Pred ( E , On, 𝑏)∀𝑓 ∈ Pred ( E , On, 𝑐)𝜃 ↔ ∀𝑒𝑏𝑓𝑐 𝜃))
2619, 25raleqbidv 3336 . . . . 5 ((𝑎 ∈ On ∧ 𝑏 ∈ On ∧ 𝑐 ∈ On) → (∀𝑑 ∈ Pred ( E , On, 𝑎)∀𝑒 ∈ Pred ( E , On, 𝑏)∀𝑓 ∈ Pred ( E , On, 𝑐)𝜃 ↔ ∀𝑑𝑎𝑒𝑏𝑓𝑐 𝜃))
2721raleqdv 3348 . . . . . 6 ((𝑎 ∈ On ∧ 𝑏 ∈ On ∧ 𝑐 ∈ On) → (∀𝑒 ∈ Pred ( E , On, 𝑏)𝜒 ↔ ∀𝑒𝑏 𝜒))
2819, 27raleqbidv 3336 . . . . 5 ((𝑎 ∈ On ∧ 𝑏 ∈ On ∧ 𝑐 ∈ On) → (∀𝑑 ∈ Pred ( E , On, 𝑎)∀𝑒 ∈ Pred ( E , On, 𝑏)𝜒 ↔ ∀𝑑𝑎𝑒𝑏 𝜒))
2923raleqdv 3348 . . . . . 6 ((𝑎 ∈ On ∧ 𝑏 ∈ On ∧ 𝑐 ∈ On) → (∀𝑓 ∈ Pred ( E , On, 𝑐)𝜁 ↔ ∀𝑓𝑐 𝜁))
3019, 29raleqbidv 3336 . . . . 5 ((𝑎 ∈ On ∧ 𝑏 ∈ On ∧ 𝑐 ∈ On) → (∀𝑑 ∈ Pred ( E , On, 𝑎)∀𝑓 ∈ Pred ( E , On, 𝑐)𝜁 ↔ ∀𝑑𝑎𝑓𝑐 𝜁))
3126, 28, 303anbi123d 1435 . . . 4 ((𝑎 ∈ On ∧ 𝑏 ∈ On ∧ 𝑐 ∈ On) → ((∀𝑑 ∈ Pred ( E , On, 𝑎)∀𝑒 ∈ Pred ( E , On, 𝑏)∀𝑓 ∈ Pred ( E , On, 𝑐)𝜃 ∧ ∀𝑑 ∈ Pred ( E , On, 𝑎)∀𝑒 ∈ Pred ( E , On, 𝑏)𝜒 ∧ ∀𝑑 ∈ Pred ( E , On, 𝑎)∀𝑓 ∈ Pred ( E , On, 𝑐)𝜁) ↔ (∀𝑑𝑎𝑒𝑏𝑓𝑐 𝜃 ∧ ∀𝑑𝑎𝑒𝑏 𝜒 ∧ ∀𝑑𝑎𝑓𝑐 𝜁)))
3219raleqdv 3348 . . . . 5 ((𝑎 ∈ On ∧ 𝑏 ∈ On ∧ 𝑐 ∈ On) → (∀𝑑 ∈ Pred ( E , On, 𝑎)𝜓 ↔ ∀𝑑𝑎 𝜓))
3323raleqdv 3348 . . . . . 6 ((𝑎 ∈ On ∧ 𝑏 ∈ On ∧ 𝑐 ∈ On) → (∀𝑓 ∈ Pred ( E , On, 𝑐)𝜏 ↔ ∀𝑓𝑐 𝜏))
3421, 33raleqbidv 3336 . . . . 5 ((𝑎 ∈ On ∧ 𝑏 ∈ On ∧ 𝑐 ∈ On) → (∀𝑒 ∈ Pred ( E , On, 𝑏)∀𝑓 ∈ Pred ( E , On, 𝑐)𝜏 ↔ ∀𝑒𝑏𝑓𝑐 𝜏))
3521raleqdv 3348 . . . . 5 ((𝑎 ∈ On ∧ 𝑏 ∈ On ∧ 𝑐 ∈ On) → (∀𝑒 ∈ Pred ( E , On, 𝑏)𝜎 ↔ ∀𝑒𝑏 𝜎))
3632, 34, 353anbi123d 1435 . . . 4 ((𝑎 ∈ On ∧ 𝑏 ∈ On ∧ 𝑐 ∈ On) → ((∀𝑑 ∈ Pred ( E , On, 𝑎)𝜓 ∧ ∀𝑒 ∈ Pred ( E , On, 𝑏)∀𝑓 ∈ Pred ( E , On, 𝑐)𝜏 ∧ ∀𝑒 ∈ Pred ( E , On, 𝑏)𝜎) ↔ (∀𝑑𝑎 𝜓 ∧ ∀𝑒𝑏𝑓𝑐 𝜏 ∧ ∀𝑒𝑏 𝜎)))
3723raleqdv 3348 . . . 4 ((𝑎 ∈ On ∧ 𝑏 ∈ On ∧ 𝑐 ∈ On) → (∀𝑓 ∈ Pred ( E , On, 𝑐)𝜂 ↔ ∀𝑓𝑐 𝜂))
3831, 36, 373anbi123d 1435 . . 3 ((𝑎 ∈ On ∧ 𝑏 ∈ On ∧ 𝑐 ∈ On) → (((∀𝑑 ∈ Pred ( E , On, 𝑎)∀𝑒 ∈ Pred ( E , On, 𝑏)∀𝑓 ∈ Pred ( E , On, 𝑐)𝜃 ∧ ∀𝑑 ∈ Pred ( E , On, 𝑎)∀𝑒 ∈ Pred ( E , On, 𝑏)𝜒 ∧ ∀𝑑 ∈ Pred ( E , On, 𝑎)∀𝑓 ∈ Pred ( E , On, 𝑐)𝜁) ∧ (∀𝑑 ∈ Pred ( E , On, 𝑎)𝜓 ∧ ∀𝑒 ∈ Pred ( E , On, 𝑏)∀𝑓 ∈ Pred ( E , On, 𝑐)𝜏 ∧ ∀𝑒 ∈ Pred ( E , On, 𝑏)𝜎) ∧ ∀𝑓 ∈ Pred ( E , On, 𝑐)𝜂) ↔ ((∀𝑑𝑎𝑒𝑏𝑓𝑐 𝜃 ∧ ∀𝑑𝑎𝑒𝑏 𝜒 ∧ ∀𝑑𝑎𝑓𝑐 𝜁) ∧ (∀𝑑𝑎 𝜓 ∧ ∀𝑒𝑏𝑓𝑐 𝜏 ∧ ∀𝑒𝑏 𝜎) ∧ ∀𝑓𝑐 𝜂)))
39 on3ind.i . . 3 ((𝑎 ∈ On ∧ 𝑏 ∈ On ∧ 𝑐 ∈ On) → (((∀𝑑𝑎𝑒𝑏𝑓𝑐 𝜃 ∧ ∀𝑑𝑎𝑒𝑏 𝜒 ∧ ∀𝑑𝑎𝑓𝑐 𝜁) ∧ (∀𝑑𝑎 𝜓 ∧ ∀𝑒𝑏𝑓𝑐 𝜏 ∧ ∀𝑒𝑏 𝜎) ∧ ∀𝑓𝑐 𝜂) → 𝜑))
4038, 39sylbid 239 . 2 ((𝑎 ∈ On ∧ 𝑏 ∈ On ∧ 𝑐 ∈ On) → (((∀𝑑 ∈ Pred ( E , On, 𝑎)∀𝑒 ∈ Pred ( E , On, 𝑏)∀𝑓 ∈ Pred ( E , On, 𝑐)𝜃 ∧ ∀𝑑 ∈ Pred ( E , On, 𝑎)∀𝑒 ∈ Pred ( E , On, 𝑏)𝜒 ∧ ∀𝑑 ∈ Pred ( E , On, 𝑎)∀𝑓 ∈ Pred ( E , On, 𝑐)𝜁) ∧ (∀𝑑 ∈ Pred ( E , On, 𝑎)𝜓 ∧ ∀𝑒 ∈ Pred ( E , On, 𝑏)∀𝑓 ∈ Pred ( E , On, 𝑐)𝜏 ∧ ∀𝑒 ∈ Pred ( E , On, 𝑏)𝜎) ∧ ∀𝑓 ∈ Pred ( E , On, 𝑐)𝜂) → 𝜑))
411, 2, 6, 7, 2, 6, 7, 2, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 40xpord3ind 33800 1 ((𝑋 ∈ On ∧ 𝑌 ∈ On ∧ 𝑍 ∈ On) → 𝜆)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 205  wa 396  wo 844  w3a 1086   = wceq 1539  wcel 2106  wne 2943  wral 3064   class class class wbr 5074  {copab 5136   E cep 5494   Po wpo 5501   Or wor 5502   We wwe 5543   × cxp 5587  Predcpred 6201  Oncon0 6266  cfv 6433  1st c1st 7829  2nd c2nd 7830
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1798  ax-4 1812  ax-5 1913  ax-6 1971  ax-7 2011  ax-8 2108  ax-9 2116  ax-10 2137  ax-11 2154  ax-12 2171  ax-ext 2709  ax-sep 5223  ax-nul 5230  ax-pow 5288  ax-pr 5352  ax-un 7588
This theorem depends on definitions:  df-bi 206  df-an 397  df-or 845  df-3or 1087  df-3an 1088  df-tru 1542  df-fal 1552  df-ex 1783  df-nf 1787  df-sb 2068  df-mo 2540  df-eu 2569  df-clab 2716  df-cleq 2730  df-clel 2816  df-nfc 2889  df-ne 2944  df-ral 3069  df-rex 3070  df-rab 3073  df-v 3434  df-sbc 3717  df-csb 3833  df-dif 3890  df-un 3892  df-in 3894  df-ss 3904  df-pss 3906  df-nul 4257  df-if 4460  df-pw 4535  df-sn 4562  df-pr 4564  df-op 4568  df-uni 4840  df-iun 4926  df-br 5075  df-opab 5137  df-mpt 5158  df-tr 5192  df-id 5489  df-eprel 5495  df-po 5503  df-so 5504  df-fr 5544  df-se 5545  df-we 5546  df-xp 5595  df-rel 5596  df-cnv 5597  df-co 5598  df-dm 5599  df-rn 5600  df-res 5601  df-ima 5602  df-pred 6202  df-ord 6269  df-on 6270  df-iota 6391  df-fun 6435  df-fv 6441  df-1st 7831  df-2nd 7832
This theorem is referenced by: (None)
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