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Mirrors > Home > MPE Home > Th. List > sstr2 | Structured version Visualization version GIF version |
Description: Transitivity of subclasses. Exercise 5 of [TakeutiZaring] p. 17. (Contributed by NM, 24-Jun-1993.) (Proof shortened by Andrew Salmon, 14-Jun-2011.) |
Ref | Expression |
---|---|
sstr2 | ⊢ (𝐴 ⊆ 𝐵 → (𝐵 ⊆ 𝐶 → 𝐴 ⊆ 𝐶)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ssel 3562 | . . . 4 ⊢ (𝐴 ⊆ 𝐵 → (𝑥 ∈ 𝐴 → 𝑥 ∈ 𝐵)) | |
2 | 1 | imim1d 80 | . . 3 ⊢ (𝐴 ⊆ 𝐵 → ((𝑥 ∈ 𝐵 → 𝑥 ∈ 𝐶) → (𝑥 ∈ 𝐴 → 𝑥 ∈ 𝐶))) |
3 | 2 | alimdv 1832 | . 2 ⊢ (𝐴 ⊆ 𝐵 → (∀𝑥(𝑥 ∈ 𝐵 → 𝑥 ∈ 𝐶) → ∀𝑥(𝑥 ∈ 𝐴 → 𝑥 ∈ 𝐶))) |
4 | dfss2 3557 | . 2 ⊢ (𝐵 ⊆ 𝐶 ↔ ∀𝑥(𝑥 ∈ 𝐵 → 𝑥 ∈ 𝐶)) | |
5 | dfss2 3557 | . 2 ⊢ (𝐴 ⊆ 𝐶 ↔ ∀𝑥(𝑥 ∈ 𝐴 → 𝑥 ∈ 𝐶)) | |
6 | 3, 4, 5 | 3imtr4g 284 | 1 ⊢ (𝐴 ⊆ 𝐵 → (𝐵 ⊆ 𝐶 → 𝐴 ⊆ 𝐶)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∀wal 1473 ∈ wcel 1977 ⊆ wss 3540 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1713 ax-4 1728 ax-5 1827 ax-6 1875 ax-7 1922 ax-10 2006 ax-11 2021 ax-12 2034 ax-13 2234 ax-ext 2590 |
This theorem depends on definitions: df-bi 196 df-or 384 df-an 385 df-tru 1478 df-ex 1696 df-nf 1701 df-sb 1868 df-clab 2597 df-cleq 2603 df-clel 2606 df-in 3547 df-ss 3554 |
This theorem is referenced by: sstr 3576 sstri 3577 sseq1 3589 sseq2 3590 ssun3 3740 ssun4 3741 ssinss1 3803 ssdisjOLD 3979 triun 4694 trint0 4698 sspwb 4844 exss 4858 frss 5005 relss 5129 funss 5822 funimass2 5886 fss 5969 suceloni 6905 limsssuc 6942 oaordi 7513 oeworde 7560 nnaordi 7585 sbthlem2 7956 sbthlem3 7957 sbthlem6 7960 domunfican 8118 fiint 8122 fiss 8213 dffi3 8220 inf3lem1 8408 trcl 8487 tcss 8503 ac10ct 8740 ackbij2lem4 8947 cfslb 8971 cfslbn 8972 cfcoflem 8977 coftr 8978 fin23lem15 9039 fin23lem20 9042 fin23lem36 9053 isf32lem1 9058 axdc3lem2 9156 ttukeylem2 9215 wunex2 9439 tskcard 9482 clsslem 13571 mrcss 16099 isacs2 16137 lubss 16944 frmdss2 17223 lsmlub 17901 lsslss 18782 lspss 18805 aspss 19153 mplcoe1 19286 mplcoe5 19289 ocv2ss 19836 ocvsscon 19838 lindsss 19982 lsslinds 19989 mdetunilem9 20245 tgss 20583 tgcl 20584 tgss3 20601 clsss 20668 ntrss 20669 neiss 20723 ssnei2 20730 opnnei 20734 cnpnei 20878 cnpco 20881 cncls 20888 cnprest 20903 hauscmp 21020 1stcfb 21058 1stcelcls 21074 reftr 21127 txcnpi 21221 txcnp 21233 txtube 21253 qtoptop2 21312 fgcl 21492 filssufilg 21525 ufileu 21533 uffix 21535 elfm2 21562 fmfnfmlem1 21568 fmco 21575 fbflim2 21591 flffbas 21609 flftg 21610 cnpflf2 21614 alexsubALTlem4 21664 neibl 22116 metcnp3 22155 xlebnum 22572 lebnumii 22573 caubl 22914 caublcls 22915 bcthlem2 22930 bcthlem5 22933 ovolsslem 23059 volsuplem 23130 dyadmbllem 23173 ellimc3 23449 limciun 23464 cpnord 23504 ubthlem1 27110 occon3 27540 chsupval 27578 chsupcl 27583 chsupss 27585 spanss 27591 chsupval2 27653 stlei 28483 dmdbr5 28551 mdsl0 28553 chrelat2i 28608 chirredlem1 28633 mdsymlem5 28650 mdsymlem6 28651 gsumle 29110 gsumvsca1 29113 gsumvsca2 29114 omsmon 29687 cvmliftlem15 30534 ss2mcls 30719 mclsax 30720 clsint2 31494 fgmin 31535 filnetlem4 31546 limsucncmpi 31614 bj-restpw 32226 ptrecube 32579 heiborlem1 32780 heiborlem8 32787 pclssN 34198 dochexmidlem7 35773 incssnn0 36292 islssfg2 36659 hbtlem6 36718 hess 37094 psshepw 37102 clsf2 37444 sspwimpcf 38178 sspwimpcfVD 38179 dvmptfprod 38835 elbigo2 42144 setrec1lem2 42234 setrec1lem4 42236 |
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