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Mirrors > Home > ILE Home > Th. List > sucelon | GIF version |
Description: The successor of an ordinal number is an ordinal number. (Contributed by NM, 9-Sep-2003.) |
Ref | Expression |
---|---|
sucelon | ⊢ (𝐴 ∈ On ↔ suc 𝐴 ∈ On) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | suceloni 4245 | . 2 ⊢ (𝐴 ∈ On → suc 𝐴 ∈ On) | |
2 | eloni 4130 | . . 3 ⊢ (suc 𝐴 ∈ On → Ord suc 𝐴) | |
3 | elex 2610 | . . . . 5 ⊢ (suc 𝐴 ∈ On → suc 𝐴 ∈ V) | |
4 | sucexb 4241 | . . . . 5 ⊢ (𝐴 ∈ V ↔ suc 𝐴 ∈ V) | |
5 | 3, 4 | sylibr 132 | . . . 4 ⊢ (suc 𝐴 ∈ On → 𝐴 ∈ V) |
6 | elong 4128 | . . . . 5 ⊢ (𝐴 ∈ V → (𝐴 ∈ On ↔ Ord 𝐴)) | |
7 | ordsucg 4246 | . . . . 5 ⊢ (𝐴 ∈ V → (Ord 𝐴 ↔ Ord suc 𝐴)) | |
8 | 6, 7 | bitrd 186 | . . . 4 ⊢ (𝐴 ∈ V → (𝐴 ∈ On ↔ Ord suc 𝐴)) |
9 | 5, 8 | syl 14 | . . 3 ⊢ (suc 𝐴 ∈ On → (𝐴 ∈ On ↔ Ord suc 𝐴)) |
10 | 2, 9 | mpbird 165 | . 2 ⊢ (suc 𝐴 ∈ On → 𝐴 ∈ On) |
11 | 1, 10 | impbii 124 | 1 ⊢ (𝐴 ∈ On ↔ suc 𝐴 ∈ On) |
Colors of variables: wff set class |
Syntax hints: ↔ wb 103 ∈ wcel 1433 Vcvv 2601 Ord word 4117 Oncon0 4118 suc csuc 4120 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 104 ax-ia2 105 ax-ia3 106 ax-io 662 ax-5 1376 ax-7 1377 ax-gen 1378 ax-ie1 1422 ax-ie2 1423 ax-8 1435 ax-10 1436 ax-11 1437 ax-i12 1438 ax-bndl 1439 ax-4 1440 ax-13 1444 ax-14 1445 ax-17 1459 ax-i9 1463 ax-ial 1467 ax-i5r 1468 ax-ext 2063 ax-sep 3896 ax-pow 3948 ax-pr 3964 ax-un 4188 |
This theorem depends on definitions: df-bi 115 df-3an 921 df-tru 1287 df-nf 1390 df-sb 1686 df-clab 2068 df-cleq 2074 df-clel 2077 df-nfc 2208 df-ral 2353 df-rex 2354 df-v 2603 df-un 2977 df-in 2979 df-ss 2986 df-pw 3384 df-sn 3404 df-pr 3405 df-uni 3602 df-tr 3876 df-iord 4121 df-on 4123 df-suc 4126 |
This theorem is referenced by: onsucmin 4251 onsucuni2 4307 |
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