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Mirrors > Home > ILE Home > Th. List > sstrdi | GIF version |
Description: Subclass transitivity deduction. (Contributed by Jonathan Ben-Naim, 3-Jun-2011.) |
Ref | Expression |
---|---|
sstrdi.1 | ⊢ (𝜑 → 𝐴 ⊆ 𝐵) |
sstrdi.2 | ⊢ 𝐵 ⊆ 𝐶 |
Ref | Expression |
---|---|
sstrdi | ⊢ (𝜑 → 𝐴 ⊆ 𝐶) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | sstrdi.1 | . 2 ⊢ (𝜑 → 𝐴 ⊆ 𝐵) | |
2 | sstrdi.2 | . . 3 ⊢ 𝐵 ⊆ 𝐶 | |
3 | 2 | a1i 9 | . 2 ⊢ (𝜑 → 𝐵 ⊆ 𝐶) |
4 | 1, 3 | sstrd 3112 | 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: difss2 3209 sstpr 3692 rintm 3913 eqbrrdva 4717 dmxpss2 4979 rnxpss2 4980 ssxpbm 4982 ssxp1 4983 ssxp2 4984 relfld 5075 funssxp 5300 dff2 5572 fliftf 5708 1stcof 6069 2ndcof 6070 tfrlemibfn 6233 tfr1onlembfn 6249 tfrcllemssrecs 6257 tfrcllembfn 6262 sucinc2 6350 peano5nnnn 7724 peano5nni 8747 suprzclex 9173 ioodisj 9806 fzssnn 9879 fzossnn0 9983 elfzom1elp1fzo 10010 frecuzrdgtcl 10216 frecuzrdgdomlem 10221 frecuzrdgfunlem 10223 zfz1iso 10616 seq3coll 10617 summodclem2a 11182 summodclem2 11183 zsumdc 11185 fsumsersdc 11196 fsum3cvg3 11197 prodmodclem2a 11377 prodmodclem2 11378 zproddc 11380 exmidunben 11975 strsetsid 12031 lmss 12454 dvbssntrcntop 12861 dvcjbr 12880 reeff1olem 12900 peano5set 13309 |
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