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Mirrors > Home > ILE Home > Th. List > dmss | 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 3131 | . . . 4 ⊢ (𝐴 ⊆ 𝐵 → (〈𝑥, 𝑦〉 ∈ 𝐴 → 〈𝑥, 𝑦〉 ∈ 𝐵)) | |
2 | 1 | eximdv 1867 | . . 3 ⊢ (𝐴 ⊆ 𝐵 → (∃𝑦〈𝑥, 𝑦〉 ∈ 𝐴 → ∃𝑦〈𝑥, 𝑦〉 ∈ 𝐵)) |
3 | vex 2724 | . . . 4 ⊢ 𝑥 ∈ V | |
4 | 3 | eldm2 4796 | . . 3 ⊢ (𝑥 ∈ dom 𝐴 ↔ ∃𝑦〈𝑥, 𝑦〉 ∈ 𝐴) |
5 | 3 | eldm2 4796 | . . 3 ⊢ (𝑥 ∈ dom 𝐵 ↔ ∃𝑦〈𝑥, 𝑦〉 ∈ 𝐵) |
6 | 2, 4, 5 | 3imtr4g 204 | . 2 ⊢ (𝐴 ⊆ 𝐵 → (𝑥 ∈ dom 𝐴 → 𝑥 ∈ dom 𝐵)) |
7 | 6 | ssrdv 3143 | 1 ⊢ (𝐴 ⊆ 𝐵 → dom 𝐴 ⊆ dom 𝐵) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∃wex 1479 ∈ wcel 2135 ⊆ wss 3111 〈cop 3573 dom cdm 4598 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-io 699 ax-5 1434 ax-7 1435 ax-gen 1436 ax-ie1 1480 ax-ie2 1481 ax-8 1491 ax-10 1492 ax-11 1493 ax-i12 1494 ax-bndl 1496 ax-4 1497 ax-17 1513 ax-i9 1517 ax-ial 1521 ax-i5r 1522 ax-ext 2146 |
This theorem depends on definitions: df-bi 116 df-3an 969 df-tru 1345 df-nf 1448 df-sb 1750 df-clab 2151 df-cleq 2157 df-clel 2160 df-nfc 2295 df-v 2723 df-un 3115 df-in 3117 df-ss 3124 df-sn 3576 df-pr 3577 df-op 3579 df-br 3977 df-dm 4608 |
This theorem is referenced by: dmeq 4798 dmv 4814 rnss 4828 dmiin 4844 dmxpss2 5030 ssxpbm 5033 ssxp1 5034 cocnvres 5122 relrelss 5124 funssxp 5351 fvun1 5546 fndmdif 5584 fneqeql2 5588 tposss 6205 smores 6251 smores2 6253 tfrlemibfn 6287 tfrlemiubacc 6289 tfr1onlembfn 6303 tfr1onlemubacc 6305 tfr1onlemres 6308 tfrcllembfn 6316 tfrcllemubacc 6318 tfrcllemres 6321 frecuzrdgtcl 10337 frecuzrdgdomlem 10342 ennnfonelemex 12284 strleund 12419 strleun 12420 dvbssntrcntop 13194 |
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