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| Mirrors > Home > ILE Home > Th. List > Mathboxes > bj-sucexg | GIF version | ||
| Description: sucexg 4559 from bounded separation. (Contributed by BJ, 13-Nov-2019.) (Proof modification is discouraged.) |
| Ref | Expression |
|---|---|
| bj-sucexg | ⊢ (𝐴 ∈ 𝑉 → suc 𝐴 ∈ V) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | bj-snexg 16017 | . . . 4 ⊢ (𝐴 ∈ 𝑉 → {𝐴} ∈ V) | |
| 2 | 1 | pm4.71i 391 | . . 3 ⊢ (𝐴 ∈ 𝑉 ↔ (𝐴 ∈ 𝑉 ∧ {𝐴} ∈ V)) |
| 3 | 2 | biimpi 120 | . 2 ⊢ (𝐴 ∈ 𝑉 → (𝐴 ∈ 𝑉 ∧ {𝐴} ∈ V)) |
| 4 | bj-unexg 16026 | . 2 ⊢ ((𝐴 ∈ 𝑉 ∧ {𝐴} ∈ V) → (𝐴 ∪ {𝐴}) ∈ V) | |
| 5 | df-suc 4431 | . . . 4 ⊢ suc 𝐴 = (𝐴 ∪ {𝐴}) | |
| 6 | 5 | eleq1i 2272 | . . 3 ⊢ (suc 𝐴 ∈ V ↔ (𝐴 ∪ {𝐴}) ∈ V) |
| 7 | 6 | biimpri 133 | . 2 ⊢ ((𝐴 ∪ {𝐴}) ∈ V → suc 𝐴 ∈ V) |
| 8 | 3, 4, 7 | 3syl 17 | 1 ⊢ (𝐴 ∈ 𝑉 → suc 𝐴 ∈ V) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∧ wa 104 ∈ wcel 2177 Vcvv 2773 ∪ cun 3168 {csn 3638 suc csuc 4425 |
| 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-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 2179 ax-14 2180 ax-ext 2188 ax-pr 4264 ax-un 4493 ax-bd0 15918 ax-bdor 15921 ax-bdex 15924 ax-bdeq 15925 ax-bdel 15926 ax-bdsb 15927 ax-bdsep 15989 |
| This theorem depends on definitions: df-bi 117 df-tru 1376 df-nf 1485 df-sb 1787 df-clab 2193 df-cleq 2199 df-clel 2202 df-nfc 2338 df-rex 2491 df-v 2775 df-un 3174 df-sn 3644 df-pr 3645 df-uni 3860 df-suc 4431 df-bdc 15946 |
| This theorem is referenced by: bj-sucex 16028 |
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