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| Mirrors > Home > ILE Home > Th. List > Mathboxes > speano5 | GIF version | ||
| Description: Version of peano5 4745 when 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 |
|---|---|
| speano5 | ⊢ ((𝐴 ∈ 𝑉 ∧ ∅ ∈ 𝐴 ∧ ∀𝑥 ∈ ω (𝑥 ∈ 𝐴 → suc 𝑥 ∈ 𝐴)) → ω ⊆ 𝐴) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | bj-omex 16968 | . . . 4 ⊢ ω ∈ V | |
| 2 | bj-inex 16933 | . . . 4 ⊢ ((ω ∈ V ∧ 𝐴 ∈ 𝑉) → (ω ∩ 𝐴) ∈ V) | |
| 3 | 1, 2 | mpan 428 | . . 3 ⊢ (𝐴 ∈ 𝑉 → (ω ∩ 𝐴) ∈ V) |
| 4 | peano5set 16966 | . . 3 ⊢ ((ω ∩ 𝐴) ∈ V → ((∅ ∈ 𝐴 ∧ ∀𝑥 ∈ ω (𝑥 ∈ 𝐴 → suc 𝑥 ∈ 𝐴)) → ω ⊆ 𝐴)) | |
| 5 | 3, 4 | syl 14 | . 2 ⊢ (𝐴 ∈ 𝑉 → ((∅ ∈ 𝐴 ∧ ∀𝑥 ∈ ω (𝑥 ∈ 𝐴 → suc 𝑥 ∈ 𝐴)) → ω ⊆ 𝐴)) |
| 6 | 5 | 3impib 1232 | 1 ⊢ ((𝐴 ∈ 𝑉 ∧ ∅ ∈ 𝐴 ∧ ∀𝑥 ∈ ω (𝑥 ∈ 𝐴 → suc 𝑥 ∈ 𝐴)) → ω ⊆ 𝐴) |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: → wi 4 ∧ wa 104 ∧ w3a 1009 ∈ wcel 2209 ∀wral 2528 Vcvv 2821 ∩ cin 3219 ⊆ wss 3220 ∅c0 3520 suc csuc 4510 ωcom 4737 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 623 ax-in2 624 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-14 2212 ax-ext 2220 ax-nul 4259 ax-pr 4346 ax-un 4578 ax-bd0 16839 ax-bdan 16841 ax-bdor 16842 ax-bdex 16845 ax-bdeq 16846 ax-bdel 16847 ax-bdsb 16848 ax-bdsep 16910 ax-infvn 16967 |
| This proof depends on definitions: df-bi 117 df-3an 1011 df-tru 1405 df-nf 1514 df-sb 1816 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-ral 2533 df-rex 2534 df-rab 2537 df-v 2823 df-dif 3222 df-un 3224 df-in 3226 df-ss 3233 df-nul 3521 df-sn 3715 df-pr 3716 df-uni 3936 df-int 3971 df-suc 4516 df-iom 4738 df-bdc 16867 df-bj-ind 16953 |
| This theorem is used by: findset 16971 |
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