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Mirrors > Home > ILE Home > Th. List > Mathboxes > bj-sucexg | GIF version |
Description: sucexg 4414 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 13110 | . . . 4 ⊢ (𝐴 ∈ 𝑉 → {𝐴} ∈ V) | |
2 | 1 | pm4.71i 388 | . . 3 ⊢ (𝐴 ∈ 𝑉 ↔ (𝐴 ∈ 𝑉 ∧ {𝐴} ∈ V)) |
3 | 2 | biimpi 119 | . 2 ⊢ (𝐴 ∈ 𝑉 → (𝐴 ∈ 𝑉 ∧ {𝐴} ∈ V)) |
4 | bj-unexg 13119 | . 2 ⊢ ((𝐴 ∈ 𝑉 ∧ {𝐴} ∈ V) → (𝐴 ∪ {𝐴}) ∈ V) | |
5 | df-suc 4293 | . . . 4 ⊢ suc 𝐴 = (𝐴 ∪ {𝐴}) | |
6 | 5 | eleq1i 2205 | . . 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 1480 Vcvv 2686 ∪ cun 3069 {csn 3527 suc csuc 4287 |
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 698 ax-5 1423 ax-7 1424 ax-gen 1425 ax-ie1 1469 ax-ie2 1470 ax-8 1482 ax-10 1483 ax-11 1484 ax-i12 1485 ax-bndl 1486 ax-4 1487 ax-13 1491 ax-14 1492 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2121 ax-pr 4131 ax-un 4355 ax-bd0 13011 ax-bdor 13014 ax-bdex 13017 ax-bdeq 13018 ax-bdel 13019 ax-bdsb 13020 ax-bdsep 13082 |
This theorem depends on definitions: df-bi 116 df-tru 1334 df-nf 1437 df-sb 1736 df-clab 2126 df-cleq 2132 df-clel 2135 df-nfc 2270 df-rex 2422 df-v 2688 df-un 3075 df-sn 3533 df-pr 3534 df-uni 3737 df-suc 4293 df-bdc 13039 |
This theorem is referenced by: bj-sucex 13121 |
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