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| Mirrors > Home > MPE Home > Th. List > wfis3 | Structured version Visualization version GIF version | ||
| Description: Well-Ordered Induction schema, using implicit substitution. (Contributed by Scott Fenton, 29-Jan-2011.) |
| Ref | Expression |
|---|---|
| wfis3.1 | ⊢ 𝑅 We 𝐴 |
| wfis3.2 | ⊢ 𝑅 Se 𝐴 |
| wfis3.3 | ⊢ (𝑦 = 𝑧 → (𝜑 ↔ 𝜓)) |
| wfis3.4 | ⊢ (𝑦 = 𝐵 → (𝜑 ↔ 𝜒)) |
| wfis3.5 | ⊢ (𝑦 ∈ 𝐴 → (∀𝑧 ∈ Pred (𝑅, 𝐴, 𝑦)𝜓 → 𝜑)) |
| Ref | Expression |
|---|---|
| wfis3 | ⊢ (𝐵 ∈ 𝐴 → 𝜒) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | wfis3.4 | . 2 ⊢ (𝑦 = 𝐵 → (𝜑 ↔ 𝜒)) | |
| 2 | wfis3.1 | . . 3 ⊢ 𝑅 We 𝐴 | |
| 3 | wfis3.2 | . . 3 ⊢ 𝑅 Se 𝐴 | |
| 4 | wfis3.3 | . . 3 ⊢ (𝑦 = 𝑧 → (𝜑 ↔ 𝜓)) | |
| 5 | wfis3.5 | . . 3 ⊢ (𝑦 ∈ 𝐴 → (∀𝑧 ∈ Pred (𝑅, 𝐴, 𝑦)𝜓 → 𝜑)) | |
| 6 | 2, 3, 4, 5 | wfis2 6308 | . 2 ⊢ (𝑦 ∈ 𝐴 → 𝜑) |
| 7 | 1, 6 | vtoclga 3520 | 1 ⊢ (𝐵 ∈ 𝐴 → 𝜒) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ↔ wb 207 = wceq 1547 ∈ wcel 2119 ∀wral 3053 Se wse 5570 We wwe 5571 Predcpred 6252 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1802 ax-4 1816 ax-5 1917 ax-6 1974 ax-7 2015 ax-8 2121 ax-9 2129 ax-10 2152 ax-11 2168 ax-12 2189 ax-ext 2711 ax-sep 5219 ax-pr 5363 |
| This theorem depends on definitions: df-bi 208 df-an 397 df-or 854 df-3an 1094 df-tru 1550 df-fal 1560 df-ex 1787 df-nf 1791 df-sb 2074 df-clab 2718 df-cleq 2731 df-clel 2814 df-nfc 2888 df-ne 2935 df-ral 3054 df-rex 3064 df-rab 3392 df-v 3433 df-sbc 3724 df-dif 3886 df-un 3888 df-in 3890 df-ss 3900 df-nul 4263 df-if 4456 df-pw 4532 df-sn 4557 df-pr 4559 df-op 4563 df-br 5074 df-opab 5136 df-po 5527 df-so 5528 df-fr 5572 df-se 5573 df-we 5574 df-xp 5625 df-cnv 5627 df-dm 5629 df-rn 5630 df-res 5631 df-ima 5632 df-pred 6253 |
| This theorem is referenced by: omsinds 7828 uzsinds 13941 onsis 28285 |
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