Metamath Proof Explorer |
< Previous
Next >
Nearby theorems |
||
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 3960 | . . . 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 1913 | . 2 ⊢ (𝐴 ⊆ 𝐵 → (∀𝑥(𝑥 ∈ 𝐵 → 𝑥 ∈ 𝐶) → ∀𝑥(𝑥 ∈ 𝐴 → 𝑥 ∈ 𝐶))) |
4 | dfss2 3954 | . 2 ⊢ (𝐵 ⊆ 𝐶 ↔ ∀𝑥(𝑥 ∈ 𝐵 → 𝑥 ∈ 𝐶)) | |
5 | dfss2 3954 | . 2 ⊢ (𝐴 ⊆ 𝐶 ↔ ∀𝑥(𝑥 ∈ 𝐴 → 𝑥 ∈ 𝐶)) | |
6 | 3, 4, 5 | 3imtr4g 298 | 1 ⊢ (𝐴 ⊆ 𝐵 → (𝐵 ⊆ 𝐶 → 𝐴 ⊆ 𝐶)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∀wal 1531 ∈ wcel 2110 ⊆ wss 3935 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1907 ax-6 1966 ax-7 2011 ax-8 2112 ax-9 2120 ax-10 2141 ax-11 2157 ax-12 2173 ax-ext 2793 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-tru 1536 df-ex 1777 df-nf 1781 df-sb 2066 df-clab 2800 df-cleq 2814 df-clel 2893 df-in 3942 df-ss 3951 |
This theorem is referenced by: sstr 3974 sstri 3975 sseq1 3991 sseq2 3992 ssun3 4149 ssun4 4150 ssinss1 4213 sspw 4551 triun 5184 trintss 5188 exss 5354 frss 5521 relss 5655 funss 6373 funimass2 6436 fss 6526 suceloni 7527 limsssuc 7564 oaordi 8171 oeworde 8218 nnaordi 8243 sbthlem2 8627 sbthlem3 8628 sbthlem6 8631 domunfican 8790 fiint 8794 fiss 8887 dffi3 8894 inf3lem1 9090 trcl 9169 tcss 9185 ac10ct 9459 ackbij2lem4 9663 cfslb 9687 cfslbn 9688 cfcoflem 9693 coftr 9694 fin23lem15 9755 fin23lem20 9758 fin23lem36 9769 isf32lem1 9774 axdc3lem2 9872 ttukeylem2 9931 wunex2 10159 tskcard 10202 clsslem 14343 mrcss 16886 isacs2 16923 lubss 17730 frmdss2 18027 lsmlub 18789 lsslss 19732 lspss 19755 aspss 20105 mplcoe1 20245 mplcoe5 20248 ocv2ss 20816 ocvsscon 20818 lindsss 20967 lsslinds 20974 mdetunilem9 21228 tgss 21575 tgcl 21576 tgss3 21593 clsss 21661 ntrss 21662 neiss 21716 ssnei2 21723 opnnei 21727 cnpnei 21871 cnpco 21874 cncls 21881 cnprest 21896 hauscmp 22014 1stcfb 22052 1stcelcls 22068 reftr 22121 txcnpi 22215 txcnp 22227 txtube 22247 qtoptop2 22306 fgcl 22485 filssufilg 22518 ufileu 22526 uffix 22528 elfm2 22555 fmfnfmlem1 22561 fmco 22568 fbflim2 22584 flffbas 22602 flftg 22603 cnpflf2 22607 alexsubALTlem4 22657 neibl 23110 metcnp3 23149 xlebnum 23568 lebnumii 23569 caubl 23910 caublcls 23911 bcthlem2 23927 bcthlem5 23930 ovolsslem 24084 volsuplem 24155 dyadmbllem 24199 ellimc3 24476 limciun 24491 cpnord 24531 ubthlem1 28646 occon3 29073 chsupval 29111 chsupcl 29116 chsupss 29118 spanss 29124 chsupval2 29186 stlei 30016 dmdbr5 30084 mdsl0 30086 chrelat2i 30141 chirredlem1 30166 mdsymlem5 30183 mdsymlem6 30184 gsumle 30725 gsumvsca1 30854 gsumvsca2 30855 omsmon 31556 cvmliftlem15 32545 ss2mcls 32815 mclsax 32816 clsint2 33677 fgmin 33718 filnetlem4 33729 limsucncmpi 33793 bj-restpw 34382 bj-0int 34392 rdgssun 34658 ptrecube 34891 heiborlem1 35088 heiborlem8 35095 refrelsredund4 35866 refrelredund4 35869 funALTVss 35931 pclssN 37029 dochexmidlem7 38601 incssnn0 39306 islssfg2 39669 hbtlem6 39727 hess 40124 psshepw 40132 clsf2 40474 mnuunid 40611 sspwimpcf 41252 sspwimpcfVD 41253 dvmptfprod 42228 sprsymrelfo 43658 elbigo2 44611 setrec1lem2 44790 setrec1lem4 44792 |
Copyright terms: Public domain | W3C validator |