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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 7822 | . . 3 ⊢ ω ⊆ On | |
| 2 | epweon 7730 | . . 3 ⊢ E We On | |
| 3 | wess 5618 | . . 3 ⊢ (ω ⊆ On → ( E We On → E We ω)) | |
| 4 | 1, 2, 3 | mp2 9 | . 2 ⊢ E We ω |
| 5 | epse 5614 | . 2 ⊢ E Se ω | |
| 6 | omsinds.1 | . 2 ⊢ (𝑥 = 𝑦 → (𝜑 ↔ 𝜓)) | |
| 7 | omsinds.2 | . 2 ⊢ (𝑥 = 𝐴 → (𝜑 ↔ 𝜒)) | |
| 8 | trom 7827 | . . . . 5 ⊢ Tr ω | |
| 9 | trpred 6297 | . . . . 5 ⊢ ((Tr ω ∧ 𝑥 ∈ ω) → Pred( E , ω, 𝑥) = 𝑥) | |
| 10 | 8, 9 | mpan 691 | . . . 4 ⊢ (𝑥 ∈ ω → Pred( E , ω, 𝑥) = 𝑥) |
| 11 | 10 | raleqdv 3298 | . . 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 240 | . 2 ⊢ (𝑥 ∈ ω → (∀𝑦 ∈ Pred ( E , ω, 𝑥)𝜓 → 𝜑)) |
| 14 | 4, 5, 6, 7, 13 | wfis3 6323 | 1 ⊢ (𝐴 ∈ ω → 𝜒) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ↔ wb 206 = wceq 1542 ∈ wcel 2114 ∀wral 3052 ⊆ wss 3903 Tr wtr 5207 E cep 5531 We wwe 5584 Predcpred 6266 Oncon0 6325 ωcom 7818 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2709 ax-sep 5243 ax-pr 5379 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-clab 2716 df-cleq 2729 df-clel 2812 df-nfc 2886 df-ne 2934 df-ral 3053 df-rex 3063 df-rab 3402 df-v 3444 df-sbc 3743 df-dif 3906 df-un 3908 df-in 3910 df-ss 3920 df-pss 3923 df-nul 4288 df-if 4482 df-pw 4558 df-sn 4583 df-pr 4585 df-op 4589 df-uni 4866 df-br 5101 df-opab 5163 df-tr 5208 df-eprel 5532 df-po 5540 df-so 5541 df-fr 5585 df-se 5586 df-we 5587 df-xp 5638 df-rel 5639 df-cnv 5640 df-dm 5642 df-rn 5643 df-res 5644 df-ima 5645 df-pred 6267 df-ord 6328 df-on 6329 df-lim 6330 df-om 7819 |
| This theorem is referenced by: madefi 27924 onsfi 28367 |
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