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Mirrors > Home > ILE Home > Th. List > sstr | GIF version |
Description: Transitivity of subclasses. Theorem 6 of [Suppes] p. 23. (Contributed by NM, 5-Sep-2003.) |
Ref | Expression |
---|---|
sstr | ⊢ ((𝐴 ⊆ 𝐵 ∧ 𝐵 ⊆ 𝐶) → 𝐴 ⊆ 𝐶) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | sstr2 3099 | . 2 ⊢ (𝐴 ⊆ 𝐵 → (𝐵 ⊆ 𝐶 → 𝐴 ⊆ 𝐶)) | |
2 | 1 | imp 123 | 1 ⊢ ((𝐴 ⊆ 𝐵 ∧ 𝐵 ⊆ 𝐶) → 𝐴 ⊆ 𝐶) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∧ wa 103 ⊆ 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-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 2119 |
This theorem depends on definitions: df-bi 116 df-nf 1437 df-sb 1736 df-clab 2124 df-cleq 2130 df-clel 2133 df-in 3072 df-ss 3079 |
This theorem is referenced by: sstrd 3102 sylan9ss 3105 ssdifss 3201 uneqin 3322 ssindif0im 3417 undifss 3438 ssrnres 4976 relrelss 5060 fco 5283 fssres 5293 ssimaex 5475 tpostpos2 6155 smores 6182 pmss12g 6562 fidcenumlemr 6836 iccsupr 9742 fimaxq 10566 fsum2d 11197 fsumabs 11227 tgval 12207 tgvalex 12208 ssnei 12309 opnneiss 12316 restdis 12342 tgcnp 12367 blssexps 12587 blssex 12588 mopni3 12642 metss 12652 metcnp3 12669 tgioo 12704 cncfmptid 12741 |
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