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| Mirrors > Home > ILE Home > Th. List > Mathboxes > bj-nnelon | GIF version | ||
| Description: A natural number is an ordinal. Constructive proof of nnon 4755. Can also be proved from bj-omssonALT 16906. (Contributed by BJ, 27-Oct-2020.) (Proof modification is discouraged.) |
| Ref | Expression |
|---|---|
| bj-nnelon | ⊢ (𝐴 ∈ ω → 𝐴 ∈ On) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | bj-nnord 16901 | . 2 ⊢ (𝐴 ∈ ω → Ord 𝐴) | |
| 2 | elong 4516 | . 2 ⊢ (𝐴 ∈ ω → (𝐴 ∈ On ↔ Ord 𝐴)) | |
| 3 | 1, 2 | mpbird 167 | 1 ⊢ (𝐴 ∈ ω → 𝐴 ∈ On) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∈ wcel 2209 Ord word 4505 Oncon0 4506 ωcom 4735 |
| 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 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 4257 ax-pr 4344 ax-un 4576 ax-bd0 16756 ax-bdor 16759 ax-bdal 16761 ax-bdex 16762 ax-bdeq 16763 ax-bdel 16764 ax-bdsb 16765 ax-bdsep 16827 ax-infvn 16884 |
| This theorem depends on definitions: df-bi 117 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 3714 df-pr 3715 df-uni 3934 df-int 3969 df-tr 4228 df-iord 4509 df-on 4511 df-suc 4514 df-iom 4736 df-bdc 16784 df-bj-ind 16870 |
| This theorem is referenced by: bj-omsson 16905 |
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