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Mirrors > Home > ILE Home > Th. List > sselii | GIF version |
Description: Membership inference from subclass relationship. (Contributed by NM, 31-May-1999.) |
Ref | Expression |
---|---|
sseli.1 | ⊢ 𝐴 ⊆ 𝐵 |
sselii.2 | ⊢ 𝐶 ∈ 𝐴 |
Ref | Expression |
---|---|
sselii | ⊢ 𝐶 ∈ 𝐵 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | sselii.2 | . 2 ⊢ 𝐶 ∈ 𝐴 | |
2 | sseli.1 | . . 3 ⊢ 𝐴 ⊆ 𝐵 | |
3 | 2 | sseli 3093 | . 2 ⊢ (𝐶 ∈ 𝐴 → 𝐶 ∈ 𝐵) |
4 | 1, 3 | ax-mp 5 | 1 ⊢ 𝐶 ∈ 𝐵 |
Colors of variables: wff set class |
Syntax hints: ∈ wcel 1480 ⊆ wss 3071 |
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-5 1423 ax-7 1424 ax-gen 1425 ax-ie1 1469 ax-ie2 1470 ax-8 1482 ax-11 1484 ax-4 1487 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2121 |
This theorem depends on definitions: df-bi 116 df-nf 1437 df-sb 1736 df-clab 2126 df-cleq 2132 df-clel 2135 df-in 3077 df-ss 3084 |
This theorem is referenced by: brtpos0 6149 ax1cn 7669 recni 7778 0xr 7812 pnfxr 7818 nn0rei 8988 0xnn0 9046 nnzi 9075 nn0zi 9076 |
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