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Mirrors > Home > ILE Home > Th. List > ssdmres | 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 3079 | . 2 ⊢ (𝐴 ⊆ dom 𝐵 ↔ (𝐴 ∩ dom 𝐵) = 𝐴) | |
2 | dmres 4835 | . . 3 ⊢ dom (𝐵 ↾ 𝐴) = (𝐴 ∩ dom 𝐵) | |
3 | 2 | eqeq1i 2145 | . 2 ⊢ (dom (𝐵 ↾ 𝐴) = 𝐴 ↔ (𝐴 ∩ dom 𝐵) = 𝐴) |
4 | 1, 3 | bitr4i 186 | 1 ⊢ (𝐴 ⊆ dom 𝐵 ↔ dom (𝐵 ↾ 𝐴) = 𝐴) |
Colors of variables: wff set class |
Syntax hints: ↔ wb 104 = wceq 1331 ∩ cin 3065 ⊆ wss 3066 dom cdm 4534 ↾ cres 4536 |
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 698 ax-5 1423 ax-7 1424 ax-gen 1425 ax-ie1 1469 ax-ie2 1470 ax-8 1482 ax-10 1483 ax-11 1484 ax-i12 1485 ax-bndl 1486 ax-4 1487 ax-14 1492 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2119 ax-sep 4041 ax-pow 4093 ax-pr 4126 |
This theorem depends on definitions: df-bi 116 df-3an 964 df-tru 1334 df-nf 1437 df-sb 1736 df-clab 2124 df-cleq 2130 df-clel 2133 df-nfc 2268 df-ral 2419 df-rex 2420 df-v 2683 df-un 3070 df-in 3072 df-ss 3079 df-pw 3507 df-sn 3528 df-pr 3529 df-op 3531 df-br 3925 df-opab 3985 df-xp 4540 df-dm 4544 df-res 4546 |
This theorem is referenced by: dmresi 4869 fnssresb 5230 fores 5349 foimacnv 5378 rdgivallem 6271 sbthlemi4 6841 |
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