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| Mirrors > Home > ILE Home > Th. List > ressbasid | GIF version | ||
| Description: The trivial structure restriction leaves the base set unchanged. (Contributed by Jim Kingdon, 29-Apr-2025.) |
| Ref | Expression |
|---|---|
| ressbasid.b | ⊢ 𝐵 = (Base‘𝑊) |
| Ref | Expression |
|---|---|
| ressbasid | ⊢ (𝑊 ∈ 𝑉 → (Base‘(𝑊 ↾s 𝐵)) = 𝐵) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eqidd 2230 | . . 3 ⊢ (𝑊 ∈ 𝑉 → (𝑊 ↾s 𝐵) = (𝑊 ↾s 𝐵)) | |
| 2 | ressbasid.b | . . . 4 ⊢ 𝐵 = (Base‘𝑊) | |
| 3 | 2 | a1i 9 | . . 3 ⊢ (𝑊 ∈ 𝑉 → 𝐵 = (Base‘𝑊)) |
| 4 | id 19 | . . 3 ⊢ (𝑊 ∈ 𝑉 → 𝑊 ∈ 𝑉) | |
| 5 | basfn 13086 | . . . . 5 ⊢ Base Fn V | |
| 6 | elex 2811 | . . . . 5 ⊢ (𝑊 ∈ 𝑉 → 𝑊 ∈ V) | |
| 7 | funfvex 5643 | . . . . . 6 ⊢ ((Fun Base ∧ 𝑊 ∈ dom Base) → (Base‘𝑊) ∈ V) | |
| 8 | 7 | funfni 5422 | . . . . 5 ⊢ ((Base Fn V ∧ 𝑊 ∈ V) → (Base‘𝑊) ∈ V) |
| 9 | 5, 6, 8 | sylancr 414 | . . . 4 ⊢ (𝑊 ∈ 𝑉 → (Base‘𝑊) ∈ V) |
| 10 | 2, 9 | eqeltrid 2316 | . . 3 ⊢ (𝑊 ∈ 𝑉 → 𝐵 ∈ V) |
| 11 | 1, 3, 4, 10 | ressbasd 13095 | . 2 ⊢ (𝑊 ∈ 𝑉 → (𝐵 ∩ 𝐵) = (Base‘(𝑊 ↾s 𝐵))) |
| 12 | inidm 3413 | . 2 ⊢ (𝐵 ∩ 𝐵) = 𝐵 | |
| 13 | 11, 12 | eqtr3di 2277 | 1 ⊢ (𝑊 ∈ 𝑉 → (Base‘(𝑊 ↾s 𝐵)) = 𝐵) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 = wceq 1395 ∈ wcel 2200 Vcvv 2799 ∩ cin 3196 Fn wfn 5312 ‘cfv 5317 (class class class)co 6000 Basecbs 13027 ↾s cress 13028 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 617 ax-in2 618 ax-io 714 ax-5 1493 ax-7 1494 ax-gen 1495 ax-ie1 1539 ax-ie2 1540 ax-8 1550 ax-10 1551 ax-11 1552 ax-i12 1553 ax-bndl 1555 ax-4 1556 ax-17 1572 ax-i9 1576 ax-ial 1580 ax-i5r 1581 ax-13 2202 ax-14 2203 ax-ext 2211 ax-sep 4201 ax-pow 4257 ax-pr 4292 ax-un 4523 ax-setind 4628 ax-cnex 8086 ax-resscn 8087 ax-1re 8089 ax-addrcl 8092 |
| This theorem depends on definitions: df-bi 117 df-3an 1004 df-tru 1398 df-fal 1401 df-nf 1507 df-sb 1809 df-eu 2080 df-mo 2081 df-clab 2216 df-cleq 2222 df-clel 2225 df-nfc 2361 df-ne 2401 df-ral 2513 df-rex 2514 df-rab 2517 df-v 2801 df-sbc 3029 df-dif 3199 df-un 3201 df-in 3203 df-ss 3210 df-nul 3492 df-pw 3651 df-sn 3672 df-pr 3673 df-op 3675 df-uni 3888 df-int 3923 df-br 4083 df-opab 4145 df-mpt 4146 df-id 4383 df-xp 4724 df-rel 4725 df-cnv 4726 df-co 4727 df-dm 4728 df-rn 4729 df-res 4730 df-iota 5277 df-fun 5319 df-fn 5320 df-fv 5325 df-ov 6003 df-oprab 6004 df-mpo 6005 df-inn 9107 df-ndx 13030 df-slot 13031 df-base 13033 df-sets 13034 df-iress 13035 |
| This theorem is referenced by: rlmscabas 14418 |
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