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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 3588 | . 2 ⊢ (𝐴 ⊆ dom 𝐵 ↔ (𝐴 ∩ dom 𝐵) = 𝐴) | |
2 | dmres 5419 | . . 3 ⊢ dom (𝐵 ↾ 𝐴) = (𝐴 ∩ dom 𝐵) | |
3 | 2 | eqeq1i 2627 | . 2 ⊢ (dom (𝐵 ↾ 𝐴) = 𝐴 ↔ (𝐴 ∩ dom 𝐵) = 𝐴) |
4 | 1, 3 | bitr4i 267 | 1 ⊢ (𝐴 ⊆ dom 𝐵 ↔ dom (𝐵 ↾ 𝐴) = 𝐴) |
Colors of variables: wff setvar class |
Syntax hints: ↔ wb 196 = wceq 1483 ∩ cin 3573 ⊆ wss 3574 dom cdm 5114 ↾ cres 5116 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1722 ax-4 1737 ax-5 1839 ax-6 1888 ax-7 1935 ax-9 1999 ax-10 2019 ax-11 2034 ax-12 2047 ax-13 2246 ax-ext 2602 ax-sep 4781 ax-nul 4789 ax-pr 4906 |
This theorem depends on definitions: df-bi 197 df-or 385 df-an 386 df-3an 1039 df-tru 1486 df-ex 1705 df-nf 1710 df-sb 1881 df-clab 2609 df-cleq 2615 df-clel 2618 df-nfc 2753 df-ral 2917 df-rex 2918 df-rab 2921 df-v 3202 df-dif 3577 df-un 3579 df-in 3581 df-ss 3588 df-nul 3916 df-if 4087 df-sn 4178 df-pr 4180 df-op 4184 df-br 4654 df-opab 4713 df-xp 5120 df-dm 5124 df-res 5126 |
This theorem is referenced by: dmresi 5457 fnssresb 6003 fores 6124 foimacnv 6154 dffv2 6271 sbthlem4 8073 hashres 13225 hashimarn 13227 dvres3 23677 c1liplem1 23759 lhop1lem 23776 lhop 23779 usgrres 26200 vtxdginducedm1lem2 26436 trlreslem 26596 hhssabloi 28119 hhssnv 28121 hhshsslem1 28124 fresf1o 29433 exidreslem 33676 divrngcl 33756 isdrngo2 33757 n0elqs2 34099 dvbdfbdioolem1 40143 fourierdlem48 40371 fourierdlem49 40372 fourierdlem71 40394 fourierdlem73 40396 fourierdlem94 40417 fourierdlem111 40434 fourierdlem112 40435 fourierdlem113 40436 fouriersw 40448 fouriercn 40449 dmvon 40820 |
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