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Mirrors > Home > ILE Home > Th. List > sucssel | GIF version |
Description: A set whose successor is a subset of another class is a member of that class. (Contributed by NM, 16-Sep-1995.) |
Ref | Expression |
---|---|
sucssel | ⊢ (𝐴 ∈ 𝑉 → (suc 𝐴 ⊆ 𝐵 → 𝐴 ∈ 𝐵)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | sucidg 4413 | . 2 ⊢ (𝐴 ∈ 𝑉 → 𝐴 ∈ suc 𝐴) | |
2 | ssel 3149 | . 2 ⊢ (suc 𝐴 ⊆ 𝐵 → (𝐴 ∈ suc 𝐴 → 𝐴 ∈ 𝐵)) | |
3 | 1, 2 | syl5com 29 | 1 ⊢ (𝐴 ∈ 𝑉 → (suc 𝐴 ⊆ 𝐵 → 𝐴 ∈ 𝐵)) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∈ wcel 2148 ⊆ wss 3129 suc csuc 4362 |
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 709 ax-5 1447 ax-7 1448 ax-gen 1449 ax-ie1 1493 ax-ie2 1494 ax-8 1504 ax-10 1505 ax-11 1506 ax-i12 1507 ax-bndl 1509 ax-4 1510 ax-17 1526 ax-i9 1530 ax-ial 1534 ax-i5r 1535 ax-ext 2159 |
This theorem depends on definitions: df-bi 117 df-tru 1356 df-nf 1461 df-sb 1763 df-clab 2164 df-cleq 2170 df-clel 2173 df-nfc 2308 df-v 2739 df-un 3133 df-in 3135 df-ss 3142 df-sn 3597 df-suc 4368 |
This theorem is referenced by: ordelsuc 4501 sucpw1nss3 7228 3nsssucpw1 7229 bj-nnelirr 14361 |
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