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Mirrors > Home > ILE Home > Th. List > sstrd | GIF version |
Description: Subclass transitivity deduction. (Contributed by NM, 2-Jun-2004.) |
Ref | Expression |
---|---|
sstrd.1 | ⊢ (𝜑 → 𝐴 ⊆ 𝐵) |
sstrd.2 | ⊢ (𝜑 → 𝐵 ⊆ 𝐶) |
Ref | Expression |
---|---|
sstrd | ⊢ (𝜑 → 𝐴 ⊆ 𝐶) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | sstrd.1 | . 2 ⊢ (𝜑 → 𝐴 ⊆ 𝐵) | |
2 | sstrd.2 | . 2 ⊢ (𝜑 → 𝐵 ⊆ 𝐶) | |
3 | sstr 3110 | . 2 ⊢ ((𝐴 ⊆ 𝐵 ∧ 𝐵 ⊆ 𝐶) → 𝐴 ⊆ 𝐶) | |
4 | 1, 2, 3 | syl2anc 409 | 1 ⊢ (𝜑 → 𝐴 ⊆ 𝐶) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ⊆ wss 3076 |
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 1424 ax-7 1425 ax-gen 1426 ax-ie1 1470 ax-ie2 1471 ax-8 1483 ax-11 1485 ax-4 1488 ax-17 1507 ax-i9 1511 ax-ial 1515 ax-i5r 1516 ax-ext 2122 |
This theorem depends on definitions: df-bi 116 df-nf 1438 df-sb 1737 df-clab 2127 df-cleq 2133 df-clel 2136 df-in 3082 df-ss 3089 |
This theorem is referenced by: sstrid 3113 sstrdi 3114 ssdif2d 3220 tfisi 4509 funss 5150 fssxp 5298 fvmptssdm 5513 suppssfv 5986 suppssov1 5987 tposss 6151 tfrlem1 6213 tfrlemibfn 6233 tfr1onlembfn 6249 tfr1onlemubacc 6251 tfr1onlemres 6254 tfrcllembfn 6262 tfrcllemubacc 6264 tfrcllemres 6267 ecinxp 6512 undifdc 6820 sbthlem1 6853 iseqf1olemnab 10292 isumss 11192 ennnfoneleminc 11960 strsetsid 12031 strleund 12086 ntrss 12327 neiint 12353 neiss 12358 restopnb 12389 iscnp4 12426 blssps 12635 blss 12636 xmettx 12718 tgqioo 12755 rescncf 12776 suplociccreex 12810 suplociccex 12811 dvbss 12862 dvbsssg 12863 dvfgg 12865 dvcnp2cntop 12871 dvcn 12872 dvaddxxbr 12873 dvmulxxbr 12874 dvcoapbr 12879 |
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