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| Mirrors > Home > MPE Home > Th. List > omsinds | Structured version Visualization version GIF version | ||
| Description: Strong (or "total") induction principle over the finite ordinals. (Contributed by Scott Fenton, 17-Jul-2015.) (Proof shortened by BJ, 16-Oct-2024.) |
| Ref | Expression |
|---|---|
| omsinds.1 | ⊢ (𝑥 = 𝑦 → (𝜑 ↔ 𝜓)) |
| omsinds.2 | ⊢ (𝑥 = 𝐴 → (𝜑 ↔ 𝜒)) |
| omsinds.3 | ⊢ (𝑥 ∈ ω → (∀𝑦 ∈ 𝑥 𝜓 → 𝜑)) |
| Ref | Expression |
|---|---|
| omsinds | ⊢ (𝐴 ∈ ω → 𝜒) |
| Step | Hyp | Ref | 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)) | |
| 4 | 1, 2, 3 | mp2 9 | . 2 ⊢ E We ω |
| 5 | epse 5643 | . 2 ⊢ E Se ω | |
| 6 | omsinds.1 | . 2 ⊢ (𝑥 = 𝑦 → (𝜑 ↔ 𝜓)) | |
| 7 | omsinds.2 | . 2 ⊢ (𝑥 = 𝐴 → (𝜑 ↔ 𝜒)) | |
| 8 | trom 7867 | . . . . 5 ⊢ Tr ω | |
| 9 | trpred 6332 | . . . . 5 ⊢ ((Tr ω ∧ 𝑥 ∈ ω) → Pred( E , ω, 𝑥) = 𝑥) | |
| 10 | 8, 9 | mpan 702 | . . . 4 ⊢ (𝑥 ∈ ω → Pred( E , ω, 𝑥) = 𝑥) |
| 11 | 10 | raleqdv 3323 | . . 3 ⊢ (𝑥 ∈ ω → (∀𝑦 ∈ Pred ( E , ω, 𝑥)𝜓 ↔ ∀𝑦 ∈ 𝑥 𝜓)) |
| 12 | omsinds.3 | . . 3 ⊢ (𝑥 ∈ ω → (∀𝑦 ∈ 𝑥 𝜓 → 𝜑)) | |
| 13 | 11, 12 | sylbid 243 | . 2 ⊢ (𝑥 ∈ ω → (∀𝑦 ∈ Pred ( E , ω, 𝑥)𝜓 → 𝜑)) |
| 14 | 4, 5, 6, 7, 13 | wfis3 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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