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Theorem omsinds 7879
Description: Strong (or "total") induction principle over the finite ordinals. (Contributed by Scott Fenton, 17-Jul-2015.) (Proof shortened by BJ, 16-Oct-2024.)
Hypotheses
Ref Expression
omsinds.1 (𝑥 = 𝑦 → (𝜑𝜓))
omsinds.2 (𝑥 = 𝐴 → (𝜑𝜒))
omsinds.3 (𝑥 ∈ ω → (∀𝑦𝑥 𝜓𝜑))
Assertion
Ref Expression
omsinds (𝐴 ∈ ω → 𝜒)
Distinct variable groups:   𝑥,𝐴   𝜒,𝑥   𝜑,𝑦   𝜓,𝑥   𝑥,𝑦
Allowed substitution hints:   𝜑(𝑥)   𝜓(𝑦)   𝜒(𝑦)   𝐴(𝑦)

Proof of Theorem omsinds
StepHypRef Expression
1 omsson 7862 . . 3 ω ⊆ On
2 epweon 7770 . . 3 E We On
3 wess 5647 . . 3 (ω ⊆ On → ( E We On → E We ω))
41, 2, 3mp2 9 . 2 E We ω
5 epse 5643 . 2 E Se ω
6 omsinds.1 . 2 (𝑥 = 𝑦 → (𝜑𝜓))
7 omsinds.2 . 2 (𝑥 = 𝐴 → (𝜑𝜒))
8 trom 7867 . . . . 5 Tr ω
9 trpred 6332 . . . . 5 ((Tr ω ∧ 𝑥 ∈ ω) → Pred( E , ω, 𝑥) = 𝑥)
108, 9mpan 702 . . . 4 (𝑥 ∈ ω → Pred( E , ω, 𝑥) = 𝑥)
1110raleqdv 3323 . . 3 (𝑥 ∈ ω → (∀𝑦 ∈ Pred ( E , ω, 𝑥)𝜓 ↔ ∀𝑦𝑥 𝜓))
12 omsinds.3 . . 3 (𝑥 ∈ ω → (∀𝑦𝑥 𝜓𝜑))
1311, 12sylbid 243 . 2 (𝑥 ∈ ω → (∀𝑦 ∈ Pred ( E , ω, 𝑥)𝜓𝜑))
144, 5, 6, 7, 13wfis3 6358 1 (𝐴 ∈ ω → 𝜒)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 209   = wceq 1570  wcel 2143  wral 3079  wss 3905  Tr wtr 5218   E cep 5560   We wwe 5613  Predcpred 6301  Oncon0 6360  ωcom 7858
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1825  ax-4 1839  ax-5 1940  ax-6 1997  ax-7 2038  ax-8 2145  ax-9 2153  ax-10 2176  ax-11 2192  ax-12 2213  ax-ext 2735  ax-sep 5257  ax-pr 5404
This theorem depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3or 1104  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1810  df-nf 1814  df-sb 2097  df-clab 2742  df-cleq 2755  df-clel 2838  df-nfc 2912  df-ne 2959  df-ral 3080  df-rex 3090  df-rab 3417  df-v 3457  df-sbc 3745  df-dif 3908  df-un 3910  df-in 3912  df-ss 3922  df-pss 3925  df-nul 4287  df-if 4488  df-pw 4564  df-sn 4590  df-pr 4592  df-op 4596  df-uni 4873  df-br 5110  df-opab 5174  df-tr 5219  df-eprel 5561  df-po 5569  df-so 5570  df-fr 5614  df-se 5615  df-we 5616  df-xp 5667  df-rel 5668  df-cnv 5669  df-dm 5671  df-rn 5672  df-res 5673  df-ima 5674  df-pred 6302  df-ord 6363  df-on 6364  df-lim 6365  df-om 7859
This theorem is referenced by:  madefi  28106  onsfi  28549
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