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Mirrors > Home > ILE Home > Th. List > sslin | GIF version |
Description: Add left intersection to subclass relation. (Contributed by NM, 19-Oct-1999.) |
Ref | Expression |
---|---|
sslin | ⊢ (𝐴 ⊆ 𝐵 → (𝐶 ∩ 𝐴) ⊆ (𝐶 ∩ 𝐵)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ssrin 3296 | . 2 ⊢ (𝐴 ⊆ 𝐵 → (𝐴 ∩ 𝐶) ⊆ (𝐵 ∩ 𝐶)) | |
2 | incom 3263 | . 2 ⊢ (𝐶 ∩ 𝐴) = (𝐴 ∩ 𝐶) | |
3 | incom 3263 | . 2 ⊢ (𝐶 ∩ 𝐵) = (𝐵 ∩ 𝐶) | |
4 | 1, 2, 3 | 3sstr4g 3135 | 1 ⊢ (𝐴 ⊆ 𝐵 → (𝐶 ∩ 𝐴) ⊆ (𝐶 ∩ 𝐵)) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∩ cin 3065 ⊆ wss 3066 |
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-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2119 |
This theorem depends on definitions: df-bi 116 df-tru 1334 df-nf 1437 df-sb 1736 df-clab 2124 df-cleq 2130 df-clel 2133 df-nfc 2268 df-v 2683 df-in 3072 df-ss 3079 |
This theorem is referenced by: ss2in 3299 difdifdirss 3442 ssres2 4841 ssrnres 4976 sbthlem7 6844 ioodisj 9769 ntrss 12277 cnptoprest 12397 |
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