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Mirrors > Home > MPE Home > Th. List > dmss | Structured version Visualization version GIF version |
Description: Subset theorem for domain. (Contributed by NM, 11-Aug-1994.) |
Ref | Expression |
---|---|
dmss | ⊢ (𝐴 ⊆ 𝐵 → dom 𝐴 ⊆ dom 𝐵) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ssel 3562 | . . . 4 ⊢ (𝐴 ⊆ 𝐵 → (〈𝑥, 𝑦〉 ∈ 𝐴 → 〈𝑥, 𝑦〉 ∈ 𝐵)) | |
2 | 1 | eximdv 1833 | . . 3 ⊢ (𝐴 ⊆ 𝐵 → (∃𝑦〈𝑥, 𝑦〉 ∈ 𝐴 → ∃𝑦〈𝑥, 𝑦〉 ∈ 𝐵)) |
3 | vex 3176 | . . . 4 ⊢ 𝑥 ∈ V | |
4 | 3 | eldm2 5244 | . . 3 ⊢ (𝑥 ∈ dom 𝐴 ↔ ∃𝑦〈𝑥, 𝑦〉 ∈ 𝐴) |
5 | 3 | eldm2 5244 | . . 3 ⊢ (𝑥 ∈ dom 𝐵 ↔ ∃𝑦〈𝑥, 𝑦〉 ∈ 𝐵) |
6 | 2, 4, 5 | 3imtr4g 284 | . 2 ⊢ (𝐴 ⊆ 𝐵 → (𝑥 ∈ dom 𝐴 → 𝑥 ∈ dom 𝐵)) |
7 | 6 | ssrdv 3574 | 1 ⊢ (𝐴 ⊆ 𝐵 → dom 𝐴 ⊆ dom 𝐵) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∃wex 1695 ∈ wcel 1977 ⊆ wss 3540 〈cop 4131 dom cdm 5038 |
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-3an 1033 df-tru 1478 df-ex 1696 df-nf 1701 df-sb 1868 df-clab 2597 df-cleq 2603 df-clel 2606 df-nfc 2740 df-rab 2905 df-v 3175 df-dif 3543 df-un 3545 df-in 3547 df-ss 3554 df-nul 3875 df-if 4037 df-sn 4126 df-pr 4128 df-op 4132 df-br 4584 df-dm 5048 |
This theorem is referenced by: dmeq 5246 dmv 5262 rnss 5275 dmiin 5290 ssxpb 5487 sofld 5500 relrelss 5576 funssxp 5974 fndmdif 6229 fneqeql2 6234 dff3 6280 frxp 7174 fnwelem 7179 funsssuppss 7208 tposss 7240 wfrlem16 7317 smores 7336 smores2 7338 tfrlem13 7373 imafi 8142 hartogslem1 8330 wemapso 8339 r0weon 8718 infxpenlem 8719 brdom3 9231 brdom5 9232 brdom4 9233 fpwwe2lem13 9343 fpwwe2 9344 canth4 9348 canthwelem 9351 pwfseqlem4 9363 nqerf 9631 dmrecnq 9669 uzrdgfni 12619 dmtrclfv 13607 rlimpm 14079 isstruct2 15704 strlemor1 15796 strleun 15799 imasaddfnlem 16011 imasvscafn 16020 isohom 16259 catcoppccl 16581 tsrss 17046 ledm 17047 dirdm 17057 f1omvdmvd 17686 mvdco 17688 f1omvdconj 17689 pmtrfb 17708 pmtrfconj 17709 symggen 17713 symggen2 17714 pmtrdifellem1 17719 pmtrdifellem2 17720 psgnunilem1 17736 gsum2d 18194 lspextmo 18877 dsmmfi 19901 lindfres 19981 mdetdiaglem 20223 tsmsxp 21768 ustssco 21828 setsmstopn 22093 metustexhalf 22171 tngtopn 22264 equivcau 22906 cmetss 22921 dvbssntr 23470 pserdv 23987 structgrssvtxlem 25700 uhgrares 25837 umgrares 25853 usgrares 25898 hlimcaui 27477 metideq 29264 esum2d 29482 fundmpss 30910 fixssdm 31183 filnetlem3 31545 filnetlem4 31546 ssbnd 32757 bnd2lem 32760 ismrcd1 36279 istopclsd 36281 mptrcllem 36939 cnvrcl0 36951 dmtrcl 36953 dfrcl2 36985 relexpss1d 37016 rp-imass 37085 rfovcnvf1od 37318 fourierdlem80 39079 issmflem 39613 subgreldmiedg 40507 |
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