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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 3963 | . . . 4 ⊢ (𝐴 ⊆ 𝐵 → (〈𝑥, 𝑦〉 ∈ 𝐴 → 〈𝑥, 𝑦〉 ∈ 𝐵)) | |
2 | 1 | eximdv 1918 | . . 3 ⊢ (𝐴 ⊆ 𝐵 → (∃𝑦〈𝑥, 𝑦〉 ∈ 𝐴 → ∃𝑦〈𝑥, 𝑦〉 ∈ 𝐵)) |
3 | vex 3499 | . . . 4 ⊢ 𝑥 ∈ V | |
4 | 3 | eldm2 5772 | . . 3 ⊢ (𝑥 ∈ dom 𝐴 ↔ ∃𝑦〈𝑥, 𝑦〉 ∈ 𝐴) |
5 | 3 | eldm2 5772 | . . 3 ⊢ (𝑥 ∈ dom 𝐵 ↔ ∃𝑦〈𝑥, 𝑦〉 ∈ 𝐵) |
6 | 2, 4, 5 | 3imtr4g 298 | . 2 ⊢ (𝐴 ⊆ 𝐵 → (𝑥 ∈ dom 𝐴 → 𝑥 ∈ dom 𝐵)) |
7 | 6 | ssrdv 3975 | 1 ⊢ (𝐴 ⊆ 𝐵 → dom 𝐴 ⊆ dom 𝐵) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∃wex 1780 ∈ wcel 2114 ⊆ wss 3938 〈cop 4575 dom cdm 5557 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2795 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3an 1085 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-clab 2802 df-cleq 2816 df-clel 2895 df-nfc 2965 df-rab 3149 df-v 3498 df-dif 3941 df-un 3943 df-in 3945 df-ss 3954 df-nul 4294 df-if 4470 df-sn 4570 df-pr 4572 df-op 4576 df-br 5069 df-dm 5567 |
This theorem is referenced by: dmeq 5774 dmv 5794 rnss 5811 dmiin 5827 ssxpb 6033 sofld 6046 relrelss 6126 funssxp 6537 fndmdif 6814 fneqeql2 6819 dff3 6868 frxp 7822 fnwelem 7827 funsssuppss 7858 tposss 7895 wfrlem16 7972 smores 7991 smores2 7993 tfrlem13 8028 imafi 8819 hartogslem1 9008 wemapso 9017 r0weon 9440 infxpenlem 9441 brdom3 9952 brdom5 9953 brdom4 9954 fpwwe2lem13 10066 fpwwe2 10067 canth4 10071 canthwelem 10074 pwfseqlem4 10086 nqerf 10354 dmrecnq 10392 uzrdgfni 13329 hashdmpropge2 13844 dmtrclfv 14380 rlimpm 14859 isstruct2 16495 strleun 16593 imasaddfnlem 16803 imasvscafn 16812 isohom 17048 catcoppccl 17370 tsrss 17835 ledm 17836 dirdm 17846 f1omvdmvd 18573 mvdco 18575 f1omvdconj 18576 pmtrfb 18595 pmtrfconj 18596 symggen 18600 symggen2 18601 pmtrdifellem1 18606 pmtrdifellem2 18607 psgnunilem1 18623 gsum2d 19094 lspextmo 19830 dsmmfi 20884 lindfres 20969 mdetdiaglem 21209 tsmsxp 22765 ustssco 22825 setsmstopn 23090 metustexhalf 23168 tngtopn 23261 equivcau 23905 metsscmetcld 23920 dvbssntr 24500 pserdv 25019 subgreldmiedg 27067 hlimcaui 29015 nfpconfp 30379 symgcom2 30730 pmtrcnel 30735 pmtrcnel2 30736 pmtrcnelor 30737 cycpmrn 30787 metideq 31135 esum2d 31354 subgrwlk 32381 fundmpss 33011 frrlem8 33132 frrlem14 33138 fixssdm 33369 filnetlem3 33730 filnetlem4 33731 ssbnd 35068 bnd2lem 35071 ismrcd1 39302 istopclsd 39304 mptrcllem 39980 cnvrcl0 39992 dmtrcl 39994 dfrcl2 40026 relexpss1d 40057 rp-imass 40124 rfovcnvf1od 40357 fourierdlem80 42478 issmflem 43011 |
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