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| Mirrors > Home > ILE Home > Th. List > Mathboxes > bj-sucexg | GIF version | ||
| Description: sucexg 4602 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 16611 | . . . 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 16620 | . 2 ⊢ ((𝐴 ∈ 𝑉 ∧ {𝐴} ∈ V) → (𝐴 ∪ {𝐴}) ∈ V) | |
| 5 | df-suc 4474 | . . . 4 ⊢ suc 𝐴 = (𝐴 ∪ {𝐴}) | |
| 6 | 5 | eleq1i 2297 | . . 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 2202 Vcvv 2803 ∪ cun 3199 {csn 3673 suc csuc 4468 |
| 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 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-13 2204 ax-14 2205 ax-ext 2213 ax-pr 4305 ax-un 4536 ax-bd0 16512 ax-bdor 16515 ax-bdex 16518 ax-bdeq 16519 ax-bdel 16520 ax-bdsb 16521 ax-bdsep 16583 |
| This theorem depends on definitions: df-bi 117 df-tru 1401 df-nf 1510 df-sb 1811 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2364 df-rex 2517 df-v 2805 df-un 3205 df-sn 3679 df-pr 3680 df-uni 3899 df-suc 4474 df-bdc 16540 |
| This theorem is referenced by: bj-sucex 16622 |
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