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| Mirrors > Home > ILE Home > Th. List > Mathboxes > bj-peano2 | GIF version | ||
| Description: Constructive proof of peano2 4661. Temporary note: another possibility is to simply replace sucexg 4564 with bj-sucexg 16057 in the proof of peano2 4661. (Contributed by BJ, 18-Nov-2019.) (Proof modification is discouraged.) |
| Ref | Expression |
|---|---|
| bj-peano2 | ⊢ (𝐴 ∈ ω → suc 𝐴 ∈ ω) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | bj-omind 16069 | . 2 ⊢ Ind ω | |
| 2 | bj-indsuc 16063 | . 2 ⊢ (Ind ω → (𝐴 ∈ ω → suc 𝐴 ∈ ω)) | |
| 3 | 1, 2 | ax-mp 5 | 1 ⊢ (𝐴 ∈ ω → suc 𝐴 ∈ ω) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∈ wcel 2178 suc csuc 4430 ωcom 4656 Ind wind 16061 |
| 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 615 ax-in2 616 ax-io 711 ax-5 1471 ax-7 1472 ax-gen 1473 ax-ie1 1517 ax-ie2 1518 ax-8 1528 ax-10 1529 ax-11 1530 ax-i12 1531 ax-bndl 1533 ax-4 1534 ax-17 1550 ax-i9 1554 ax-ial 1558 ax-i5r 1559 ax-13 2180 ax-14 2181 ax-ext 2189 ax-nul 4186 ax-pr 4269 ax-un 4498 ax-bd0 15948 ax-bdor 15951 ax-bdex 15954 ax-bdeq 15955 ax-bdel 15956 ax-bdsb 15957 ax-bdsep 16019 |
| This theorem depends on definitions: df-bi 117 df-tru 1376 df-nf 1485 df-sb 1787 df-clab 2194 df-cleq 2200 df-clel 2203 df-nfc 2339 df-ral 2491 df-rex 2492 df-rab 2495 df-v 2778 df-dif 3176 df-un 3178 df-nul 3469 df-sn 3649 df-pr 3650 df-uni 3865 df-int 3900 df-suc 4436 df-iom 4657 df-bdc 15976 df-bj-ind 16062 |
| This theorem is referenced by: bj-nn0suc 16099 bj-nn0sucALT 16113 |
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