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| Mirrors > Home > ILE Home > Th. List > Mathboxes > peano5set | GIF version | ||
| Description: Version of peano5 4696 when ω ∩ 𝐴 is assumed to be a set, allowing a proof from the core axioms of CZF. (Contributed by BJ, 19-Nov-2019.) (Proof modification is discouraged.) |
| Ref | Expression |
|---|---|
| peano5set | ⊢ ((ω ∩ 𝐴) ∈ 𝑉 → ((∅ ∈ 𝐴 ∧ ∀𝑥 ∈ ω (𝑥 ∈ 𝐴 → suc 𝑥 ∈ 𝐴)) → ω ⊆ 𝐴)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | bj-omind 16555 | . . . . 5 ⊢ Ind ω | |
| 2 | bj-indind 16553 | . . . . 5 ⊢ ((Ind ω ∧ (∅ ∈ 𝐴 ∧ ∀𝑥 ∈ ω (𝑥 ∈ 𝐴 → suc 𝑥 ∈ 𝐴))) → Ind (ω ∩ 𝐴)) | |
| 3 | 1, 2 | mpan 424 | . . . 4 ⊢ ((∅ ∈ 𝐴 ∧ ∀𝑥 ∈ ω (𝑥 ∈ 𝐴 → suc 𝑥 ∈ 𝐴)) → Ind (ω ∩ 𝐴)) |
| 4 | bj-omssind 16556 | . . . . 5 ⊢ ((ω ∩ 𝐴) ∈ 𝑉 → (Ind (ω ∩ 𝐴) → ω ⊆ (ω ∩ 𝐴))) | |
| 5 | 4 | imp 124 | . . . 4 ⊢ (((ω ∩ 𝐴) ∈ 𝑉 ∧ Ind (ω ∩ 𝐴)) → ω ⊆ (ω ∩ 𝐴)) |
| 6 | 3, 5 | sylan2 286 | . . 3 ⊢ (((ω ∩ 𝐴) ∈ 𝑉 ∧ (∅ ∈ 𝐴 ∧ ∀𝑥 ∈ ω (𝑥 ∈ 𝐴 → suc 𝑥 ∈ 𝐴))) → ω ⊆ (ω ∩ 𝐴)) |
| 7 | inss2 3428 | . . 3 ⊢ (ω ∩ 𝐴) ⊆ 𝐴 | |
| 8 | 6, 7 | sstrdi 3239 | . 2 ⊢ (((ω ∩ 𝐴) ∈ 𝑉 ∧ (∅ ∈ 𝐴 ∧ ∀𝑥 ∈ ω (𝑥 ∈ 𝐴 → suc 𝑥 ∈ 𝐴))) → ω ⊆ 𝐴) |
| 9 | 8 | ex 115 | 1 ⊢ ((ω ∩ 𝐴) ∈ 𝑉 → ((∅ ∈ 𝐴 ∧ ∀𝑥 ∈ ω (𝑥 ∈ 𝐴 → suc 𝑥 ∈ 𝐴)) → ω ⊆ 𝐴)) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∧ wa 104 ∈ wcel 2202 ∀wral 2510 ∩ cin 3199 ⊆ wss 3200 ∅c0 3494 suc csuc 4462 ωcom 4688 Ind wind 16547 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 619 ax-in2 620 ax-io 716 ax-5 1495 ax-7 1496 ax-gen 1497 ax-ie1 1541 ax-ie2 1542 ax-8 1552 ax-10 1553 ax-11 1554 ax-i12 1555 ax-bndl 1557 ax-4 1558 ax-17 1574 ax-i9 1578 ax-ial 1582 ax-i5r 1583 ax-13 2204 ax-14 2205 ax-ext 2213 ax-nul 4215 ax-pr 4299 ax-un 4530 ax-bd0 16434 ax-bdor 16437 ax-bdex 16440 ax-bdeq 16441 ax-bdel 16442 ax-bdsb 16443 ax-bdsep 16505 |
| This theorem depends on definitions: df-bi 117 df-tru 1400 df-nf 1509 df-sb 1811 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2363 df-ral 2515 df-rex 2516 df-rab 2519 df-v 2804 df-dif 3202 df-un 3204 df-in 3206 df-ss 3213 df-nul 3495 df-sn 3675 df-pr 3676 df-uni 3894 df-int 3929 df-suc 4468 df-iom 4689 df-bdc 16462 df-bj-ind 16548 |
| This theorem is referenced by: bdpeano5 16564 speano5 16565 |
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