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Mirrors > Home > ILE Home > Th. List > Mathboxes > bj-sucexg | GIF version |
Description: sucexg 4475 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 13804 | . . . 4 ⊢ (𝐴 ∈ 𝑉 → {𝐴} ∈ V) | |
2 | 1 | pm4.71i 389 | . . 3 ⊢ (𝐴 ∈ 𝑉 ↔ (𝐴 ∈ 𝑉 ∧ {𝐴} ∈ V)) |
3 | 2 | biimpi 119 | . 2 ⊢ (𝐴 ∈ 𝑉 → (𝐴 ∈ 𝑉 ∧ {𝐴} ∈ V)) |
4 | bj-unexg 13813 | . 2 ⊢ ((𝐴 ∈ 𝑉 ∧ {𝐴} ∈ V) → (𝐴 ∪ {𝐴}) ∈ V) | |
5 | df-suc 4349 | . . . 4 ⊢ suc 𝐴 = (𝐴 ∪ {𝐴}) | |
6 | 5 | eleq1i 2232 | . . 3 ⊢ (suc 𝐴 ∈ V ↔ (𝐴 ∪ {𝐴}) ∈ V) |
7 | 6 | biimpri 132 | . 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 103 ∈ wcel 2136 Vcvv 2726 ∪ cun 3114 {csn 3576 suc csuc 4343 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-io 699 ax-5 1435 ax-7 1436 ax-gen 1437 ax-ie1 1481 ax-ie2 1482 ax-8 1492 ax-10 1493 ax-11 1494 ax-i12 1495 ax-bndl 1497 ax-4 1498 ax-17 1514 ax-i9 1518 ax-ial 1522 ax-i5r 1523 ax-13 2138 ax-14 2139 ax-ext 2147 ax-pr 4187 ax-un 4411 ax-bd0 13705 ax-bdor 13708 ax-bdex 13711 ax-bdeq 13712 ax-bdel 13713 ax-bdsb 13714 ax-bdsep 13776 |
This theorem depends on definitions: df-bi 116 df-tru 1346 df-nf 1449 df-sb 1751 df-clab 2152 df-cleq 2158 df-clel 2161 df-nfc 2297 df-rex 2450 df-v 2728 df-un 3120 df-sn 3582 df-pr 3583 df-uni 3790 df-suc 4349 df-bdc 13733 |
This theorem is referenced by: bj-sucex 13815 |
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