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| Mirrors > Home > ILE Home > Th. List > Mathboxes > bj-sucexg | GIF version | ||
| Description: sucexg 4534 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 15558 | . . . 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 15567 | . 2 ⊢ ((𝐴 ∈ 𝑉 ∧ {𝐴} ∈ V) → (𝐴 ∪ {𝐴}) ∈ V) | |
| 5 | df-suc 4406 | . . . 4 ⊢ suc 𝐴 = (𝐴 ∪ {𝐴}) | |
| 6 | 5 | eleq1i 2262 | . . 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 2167 Vcvv 2763 ∪ cun 3155 {csn 3622 suc csuc 4400 |
| 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 710 ax-5 1461 ax-7 1462 ax-gen 1463 ax-ie1 1507 ax-ie2 1508 ax-8 1518 ax-10 1519 ax-11 1520 ax-i12 1521 ax-bndl 1523 ax-4 1524 ax-17 1540 ax-i9 1544 ax-ial 1548 ax-i5r 1549 ax-13 2169 ax-14 2170 ax-ext 2178 ax-pr 4242 ax-un 4468 ax-bd0 15459 ax-bdor 15462 ax-bdex 15465 ax-bdeq 15466 ax-bdel 15467 ax-bdsb 15468 ax-bdsep 15530 |
| This theorem depends on definitions: df-bi 117 df-tru 1367 df-nf 1475 df-sb 1777 df-clab 2183 df-cleq 2189 df-clel 2192 df-nfc 2328 df-rex 2481 df-v 2765 df-un 3161 df-sn 3628 df-pr 3629 df-uni 3840 df-suc 4406 df-bdc 15487 |
| This theorem is referenced by: bj-sucex 15569 |
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