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Mirrors > Home > MPE Home > Th. List > ssdmres | Structured version Visualization version GIF version |
Description: A domain restricted to a subclass equals the subclass. (Contributed by NM, 2-Mar-1997.) |
Ref | Expression |
---|---|
ssdmres | ⊢ (𝐴 ⊆ dom 𝐵 ↔ dom (𝐵 ↾ 𝐴) = 𝐴) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-ss 3945 | . 2 ⊢ (𝐴 ⊆ dom 𝐵 ↔ (𝐴 ∩ dom 𝐵) = 𝐴) | |
2 | dmres 5868 | . . 3 ⊢ dom (𝐵 ↾ 𝐴) = (𝐴 ∩ dom 𝐵) | |
3 | 2 | eqeq1i 2825 | . 2 ⊢ (dom (𝐵 ↾ 𝐴) = 𝐴 ↔ (𝐴 ∩ dom 𝐵) = 𝐴) |
4 | 1, 3 | bitr4i 280 | 1 ⊢ (𝐴 ⊆ dom 𝐵 ↔ dom (𝐵 ↾ 𝐴) = 𝐴) |
Colors of variables: wff setvar class |
Syntax hints: ↔ wb 208 = wceq 1536 ∩ cin 3928 ⊆ wss 3929 dom cdm 5548 ↾ cres 5550 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1969 ax-7 2014 ax-8 2115 ax-9 2123 ax-10 2144 ax-11 2160 ax-12 2176 ax-ext 2792 ax-sep 5196 ax-nul 5203 ax-pr 5323 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3an 1084 df-tru 1539 df-ex 1780 df-nf 1784 df-sb 2069 df-clab 2799 df-cleq 2813 df-clel 2892 df-nfc 2962 df-ral 3142 df-rex 3143 df-rab 3146 df-v 3493 df-dif 3932 df-un 3934 df-in 3936 df-ss 3945 df-nul 4285 df-if 4461 df-sn 4561 df-pr 4563 df-op 4567 df-br 5060 df-opab 5122 df-xp 5554 df-dm 5558 df-res 5560 |
This theorem is referenced by: dmresi 5914 fnssresb 6462 fores 6593 foimacnv 6625 dffv2 6749 sbthlem4 8623 hashres 13796 hashimarn 13798 dvres3 24508 c1liplem1 24590 lhop1lem 24607 lhop 24610 usgrres 27088 vtxdginducedm1lem2 27320 wlkres 27450 trlreslem 27479 hhssabloi 29037 hhssnv 29039 hhshsslem1 29042 fresf1o 30376 cycpmconjvlem 30804 exidreslem 35188 divrngcl 35268 isdrngo2 35269 n0elqs2 35617 dvbdfbdioolem1 42287 fourierdlem48 42513 fourierdlem49 42514 fourierdlem71 42536 fourierdlem73 42538 fourierdlem94 42559 fourierdlem111 42576 fourierdlem112 42577 fourierdlem113 42578 fouriersw 42590 fouriercn 42591 dmvon 42962 |
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