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Mirrors > Home > MPE Home > Th. List > sstr2 | Structured version Visualization version GIF version |
Description: Transitivity of subclass relationship. 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 3908 | . . . 4 ⊢ (𝐴 ⊆ 𝐵 → (𝑥 ∈ 𝐴 → 𝑥 ∈ 𝐵)) | |
2 | 1 | imim1d 82 | . . 3 ⊢ (𝐴 ⊆ 𝐵 → ((𝑥 ∈ 𝐵 → 𝑥 ∈ 𝐶) → (𝑥 ∈ 𝐴 → 𝑥 ∈ 𝐶))) |
3 | 2 | alimdv 1917 | . 2 ⊢ (𝐴 ⊆ 𝐵 → (∀𝑥(𝑥 ∈ 𝐵 → 𝑥 ∈ 𝐶) → ∀𝑥(𝑥 ∈ 𝐴 → 𝑥 ∈ 𝐶))) |
4 | dfss2 3901 | . 2 ⊢ (𝐵 ⊆ 𝐶 ↔ ∀𝑥(𝑥 ∈ 𝐵 → 𝑥 ∈ 𝐶)) | |
5 | dfss2 3901 | . 2 ⊢ (𝐴 ⊆ 𝐶 ↔ ∀𝑥(𝑥 ∈ 𝐴 → 𝑥 ∈ 𝐶)) | |
6 | 3, 4, 5 | 3imtr4g 299 | 1 ⊢ (𝐴 ⊆ 𝐵 → (𝐵 ⊆ 𝐶 → 𝐴 ⊆ 𝐶)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∀wal 1536 ∈ wcel 2111 ⊆ wss 3881 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2113 ax-9 2121 ax-ext 2770 |
This theorem depends on definitions: df-bi 210 df-an 400 df-ex 1782 df-sb 2070 df-clab 2777 df-cleq 2791 df-clel 2870 df-v 3443 df-in 3888 df-ss 3898 |
This theorem is referenced by: sstr 3923 sstri 3924 sseq1 3940 sseq2 3941 ssun3 4101 ssun4 4102 ssinss1 4164 sspw 4510 triun 5149 trintss 5153 exss 5320 frss 5486 relss 5620 funss 6343 funimass2 6407 fss 6501 suceloni 7508 limsssuc 7545 oaordi 8155 oeworde 8202 nnaordi 8227 sbthlem2 8612 sbthlem3 8613 sbthlem6 8616 domunfican 8775 fiint 8779 fiss 8872 dffi3 8879 inf3lem1 9075 trcl 9154 tcss 9170 ac10ct 9445 ackbij2lem4 9653 cfslb 9677 cfslbn 9678 cfcoflem 9683 coftr 9684 fin23lem15 9745 fin23lem20 9748 fin23lem36 9759 isf32lem1 9764 axdc3lem2 9862 ttukeylem2 9921 wunex2 10149 tskcard 10192 clsslem 14335 mrcss 16879 isacs2 16916 lubss 17723 frmdss2 18020 lsmlub 18782 lsslss 19726 lspss 19749 ocv2ss 20362 ocvsscon 20364 lindsss 20513 lsslinds 20520 aspss 20563 mplcoe1 20705 mplcoe5 20708 mdetunilem9 21225 tgss 21573 tgcl 21574 tgss3 21591 clsss 21659 ntrss 21660 neiss 21714 ssnei2 21721 opnnei 21725 cnpnei 21869 cnpco 21872 cncls 21879 cnprest 21894 hauscmp 22012 1stcfb 22050 1stcelcls 22066 reftr 22119 txcnpi 22213 txcnp 22225 txtube 22245 qtoptop2 22304 fgcl 22483 filssufilg 22516 ufileu 22524 uffix 22526 elfm2 22553 fmfnfmlem1 22559 fmco 22566 fbflim2 22582 flffbas 22600 flftg 22601 cnpflf2 22605 alexsubALTlem4 22655 neibl 23108 metcnp3 23147 xlebnum 23570 lebnumii 23571 caubl 23912 caublcls 23913 bcthlem2 23929 bcthlem5 23932 ovolsslem 24088 volsuplem 24159 dyadmbllem 24203 ellimc3 24482 limciun 24497 cpnord 24538 ubthlem1 28653 occon3 29080 chsupval 29118 chsupcl 29123 chsupss 29125 spanss 29131 chsupval2 29193 stlei 30023 dmdbr5 30091 mdsl0 30093 chrelat2i 30148 chirredlem1 30173 mdsymlem5 30190 mdsymlem6 30191 gsumle 30775 gsumvsca1 30904 gsumvsca2 30905 omsmon 31666 cvmliftlem15 32658 ss2mcls 32928 mclsax 32929 clsint2 33790 fgmin 33831 filnetlem4 33842 limsucncmpi 33906 bj-restpw 34507 bj-0int 34516 rdgssun 34795 ptrecube 35057 heiborlem1 35249 heiborlem8 35256 refrelsredund4 36027 refrelredund4 36030 funALTVss 36092 pclssN 37190 dochexmidlem7 38762 incssnn0 39652 islssfg2 40015 hbtlem6 40073 hess 40481 psshepw 40489 clsf2 40829 mnuunid 40985 sspwimpcf 41626 sspwimpcfVD 41627 dvmptfprod 42587 sprsymrelfo 44014 elbigo2 44966 setrec1lem2 45218 setrec1lem4 45220 |
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