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| Mirrors > Home > MPE Home > Th. List > frpoins2fg | Structured version Visualization version GIF version | ||
| Description: Well-Founded Induction schema, using implicit substitution. (Contributed by Scott Fenton, 24-Aug-2022.) |
| Ref | Expression |
|---|---|
| frpoins2fg.1 | ⊢ (𝑦 ∈ 𝐴 → (∀𝑧 ∈ Pred (𝑅, 𝐴, 𝑦)𝜓 → 𝜑)) |
| frpoins2fg.2 | ⊢ Ⅎ𝑦𝜓 |
| frpoins2fg.3 | ⊢ (𝑦 = 𝑧 → (𝜑 ↔ 𝜓)) |
| Ref | Expression |
|---|---|
| frpoins2fg | ⊢ ((𝑅 Fr 𝐴 ∧ 𝑅 Po 𝐴 ∧ 𝑅 Se 𝐴) → ∀𝑦 ∈ 𝐴 𝜑) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | sbsbc 3742 | . . . . 5 ⊢ ([𝑧 / 𝑦]𝜑 ↔ [𝑧 / 𝑦]𝜑) | |
| 2 | frpoins2fg.2 | . . . . . 6 ⊢ Ⅎ𝑦𝜓 | |
| 3 | frpoins2fg.3 | . . . . . 6 ⊢ (𝑦 = 𝑧 → (𝜑 ↔ 𝜓)) | |
| 4 | 2, 3 | sbiev 2345 | . . . . 5 ⊢ ([𝑧 / 𝑦]𝜑 ↔ 𝜓) |
| 5 | 1, 4 | bitr3i 280 | . . . 4 ⊢ ([𝑧 / 𝑦]𝜑 ↔ 𝜓) |
| 6 | 5 | ralbii 3108 | . . 3 ⊢ (∀𝑧 ∈ Pred (𝑅, 𝐴, 𝑦)[𝑧 / 𝑦]𝜑 ↔ ∀𝑧 ∈ Pred (𝑅, 𝐴, 𝑦)𝜓) |
| 7 | frpoins2fg.1 | . . . 4 ⊢ (𝑦 ∈ 𝐴 → (∀𝑧 ∈ Pred (𝑅, 𝐴, 𝑦)𝜓 → 𝜑)) | |
| 8 | 7 | adantl 487 | . . 3 ⊢ (((𝑅 Fr 𝐴 ∧ 𝑅 Po 𝐴 ∧ 𝑅 Se 𝐴) ∧ 𝑦 ∈ 𝐴) → (∀𝑧 ∈ Pred (𝑅, 𝐴, 𝑦)𝜓 → 𝜑)) |
| 9 | 6, 8 | biimtrid 245 | . 2 ⊢ (((𝑅 Fr 𝐴 ∧ 𝑅 Po 𝐴 ∧ 𝑅 Se 𝐴) ∧ 𝑦 ∈ 𝐴) → (∀𝑧 ∈ Pred (𝑅, 𝐴, 𝑦)[𝑧 / 𝑦]𝜑 → 𝜑)) |
| 10 | 9 | frpoinsg 6335 | 1 ⊢ ((𝑅 Fr 𝐴 ∧ 𝑅 Po 𝐴 ∧ 𝑅 Se 𝐴) → ∀𝑦 ∈ 𝐴 𝜑) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ↔ wb 209 ∧ wa 401 ∧ w3a 1103 Ⅎwnf 1816 [wsb 2099 ∈ wcel 2145 ∀wral 3076 [wsbc 3738 Po wpo 5553 Fr wfr 5597 Se wse 5598 Predcpred 6292 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2213 ax-ext 2732 ax-sep 5248 ax-pr 5390 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-ral 3077 df-rex 3087 df-rab 3413 df-v 3452 df-sbc 3739 df-dif 3901 df-un 3903 df-in 3905 df-ss 3915 df-nul 4279 df-if 4482 df-pw 4558 df-sn 4584 df-pr 4586 df-op 4590 df-br 5103 df-opab 5167 df-po 5555 df-fr 5600 df-se 5601 df-xp 5653 df-cnv 5655 df-dm 5657 df-rn 5658 df-res 5659 df-ima 5660 df-pred 6293 |
| This theorem is used by: frpoins2g 6337 wfis2fg 6345 |
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