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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 2239 | . . 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 13389 | . . . . 5 ⊢ Base Fn V | |
| 6 | elex 2833 | . . . . 5 ⊢ (𝑊 ∈ 𝑉 → 𝑊 ∈ V) | |
| 7 | funfvex 5707 | . . . . . 6 ⊢ ((Fun Base ∧ 𝑊 ∈ dom Base) → (Base‘𝑊) ∈ V) | |
| 8 | 7 | funfni 5478 | . . . . 5 ⊢ ((Base Fn V ∧ 𝑊 ∈ V) → (Base‘𝑊) ∈ V) |
| 9 | 5, 6, 8 | sylancr 418 | . . . 4 ⊢ (𝑊 ∈ 𝑉 → (Base‘𝑊) ∈ V) |
| 10 | 2, 9 | eqeltrid 2325 | . . 3 ⊢ (𝑊 ∈ 𝑉 → 𝐵 ∈ V) |
| 11 | 1, 3, 4, 10 | ressbasd 13398 | . 2 ⊢ (𝑊 ∈ 𝑉 → (𝐵 ∩ 𝐵) = (Base‘(𝑊 ↾s 𝐵))) |
| 12 | inidm 3440 | . 2 ⊢ (𝐵 ∩ 𝐵) = 𝐵 | |
| 13 | 11, 12 | eqtr3di 2286 | 1 ⊢ (𝑊 ∈ 𝑉 → (Base‘(𝑊 ↾s 𝐵)) = 𝐵) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 = wceq 1402 ∈ wcel 2209 Vcvv 2821 ∩ cin 3219 Fn wfn 5367 ‘cfv 5372 (class class class)co 6075 Basecbs 13330 ↾s cress 13331 |
| 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 623 ax-in2 624 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-14 2212 ax-ext 2220 ax-sep 4244 ax-pow 4306 ax-pr 4341 ax-un 4573 ax-setind 4679 ax-cnex 8260 ax-resscn 8261 ax-1re 8263 ax-addrcl 8266 |
| This theorem depends on definitions: df-bi 117 df-3an 1011 df-tru 1405 df-fal 1408 df-nf 1514 df-sb 1816 df-eu 2089 df-mo 2090 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-ne 2421 df-ral 2533 df-rex 2534 df-rab 2537 df-v 2823 df-sbc 3052 df-dif 3222 df-un 3224 df-in 3226 df-ss 3233 df-nul 3521 df-pw 3687 df-sn 3711 df-pr 3712 df-op 3714 df-uni 3931 df-int 3966 df-br 4126 df-opab 4188 df-mpt 4189 df-id 4433 df-xp 4775 df-rel 4776 df-cnv 4777 df-co 4778 df-dm 4779 df-rn 4780 df-res 4781 df-iota 5332 df-fun 5374 df-fn 5375 df-fv 5380 df-ov 6078 df-oprab 6079 df-mpo 6080 df-inn 9284 df-ndx 13333 df-slot 13334 df-base 13336 df-sets 13337 df-iress 13338 |
| This theorem is referenced by: rlmscabas 14769 |
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