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Related theorems GIF version |
| Description: Value of the linear span of a subset of Hilbert space. The span is the intersection of all subspaces constraining the subset. Definition of span in [Schechter] p. 276. |
| Ref | Expression |
|---|---|
| spanvalt | ⊢ (A ⊆ ℋ → (span ‘A) = ∩{x ∈ Sℋ ∣A ⊆ x}) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ax-hilex 4983 | . . 3 ⊢ ℋ ∈ V | |
| 2 | elpw2g 1803 | . . 3 ⊢ ( ℋ ∈ V → (A ∈ ℘ ℋ ↔ A ⊆ ℋ )) | |
| 3 | 1, 2 | ax-mp 6 | . 2 ⊢ (A ∈ ℘ ℋ ↔ A ⊆ ℋ ) |
| 4 | helsh 5152 | . . . . . 6 ⊢ ℋ ∈ Sℋ | |
| 5 | sseq2 1522 | . . . . . . 7 ⊢ (x = ℋ → (A ⊆ x ↔ A ⊆ ℋ )) | |
| 6 | 5 | rcla4ev 1403 | . . . . . 6 ⊢ (( ℋ ∈ Sℋ ∧ A ⊆ ℋ ) → ∃x ∈ Sℋ A ⊆ x) |
| 7 | 4, 6 | mpan 518 | . . . . 5 ⊢ (A ⊆ ℋ → ∃x ∈ Sℋ A ⊆ x) |
| 8 | 3, 7 | sylbi 174 | . . . 4 ⊢ (A ∈ ℘ ℋ → ∃x ∈ Sℋ A ⊆ x) |
| 9 | intexrab 1988 | . . . 4 ⊢ (∃x ∈ Sℋ A ⊆ x ↔ ∩{x ∈ Sℋ ∣A ⊆ x} ∈ V) | |
| 10 | 8, 9 | sylib 173 | . . 3 ⊢ (A ∈ ℘ ℋ → ∩{x ∈ Sℋ ∣A ⊆ x} ∈ V) |
| 11 | sseq1 1521 | . . . . . 6 ⊢ (y = A → (y ⊆ x ↔ A ⊆ x)) | |
| 12 | 11 | birabsdv 1344 | . . . . 5 ⊢ (y = A → {x ∈ Sℋ ∣y ⊆ x} = {x ∈ Sℋ ∣A ⊆ x}) |
| 13 | 12 | inteqd 1970 | . . . 4 ⊢ (y = A → ∩{x ∈ Sℋ ∣y ⊆ x} = ∩{x ∈ Sℋ ∣A ⊆ x}) |
| 14 | df-span 5276 | . . . . 5 ⊢ span = {〈y, z〉∣(y ⊆ ℋ ∧ z = ∩{x ∈ Sℋ ∣y ⊆ x})} | |
| 15 | visset 1350 | . . . . . . . 8 ⊢ y ∈ V | |
| 16 | 15 | elpw 1801 | . . . . . . 7 ⊢ (y ∈ ℘ ℋ ↔ y ⊆ ℋ ) |
| 17 | 16 | anbi1i 368 | . . . . . 6 ⊢ ((y ∈ ℘ ℋ ∧ z = ∩{x ∈ Sℋ ∣y ⊆ x}) ↔ (y ⊆ ℋ ∧ z = ∩{x ∈ Sℋ ∣y ⊆ x})) |
| 18 | 17 | biopabi 2103 | . . . . 5 ⊢ {〈y, z〉∣(y ∈ ℘ ℋ ∧ z = ∩{x ∈ Sℋ ∣y ⊆ x})} = {〈y, z〉∣(y ⊆ ℋ ∧ z = ∩{x ∈ Sℋ ∣y ⊆ x})} |
| 19 | 14, 18 | eqtr4 1122 | . . . 4 ⊢ span = {〈y, z〉∣(y ∈ ℘ ℋ ∧ z = ∩{x ∈ Sℋ ∣y ⊆ x})} |
| 20 | 13, 19 | fvopab4g 2870 | . . 3 ⊢ ((A ∈ ℘ ℋ ∧ ∩{x ∈ Sℋ ∣A ⊆ x} ∈ V) → (span ‘A) = ∩{x ∈ Sℋ ∣A ⊆ x}) |
| 21 | 10, 20 | mpdan 527 | . 2 ⊢ (A ∈ ℘ ℋ → (span ‘A) = ∩{x ∈ Sℋ ∣A ⊆ x}) |
| 22 | 3, 21 | sylbir 176 | 1 ⊢ (A ⊆ ℋ → (span ‘A) = ∩{x ∈ Sℋ ∣A ⊆ x}) |
| Colors of variables: wff set class |
| Syntax hints: → wi 2 ↔ wb 127 ∧ wa 196 = wceq 1091 ∈ wcel 1092 ∃wrex 1202 {crab 1204 Vcvv 1348 ⊆ wss 1487 ℘cpw 1798 ∩cint 1965 {copab 2055 ‘cfv 2422 ℋ chil 4958 Sℋ csh 4967 spancspn 4971 |
| This theorem is referenced by: spanclt 5305 spanss2 5315 spanid 5318 spanss 5319 shsumval3 5362 elspan 5449 |
| This theorem was proved from axioms: ax-1 3 ax-2 4 ax-3 5 ax-mp 6 ax-4 673 ax-5 674 ax-6 675 ax-7 676 ax-gen 677 ax-8 798 ax-9 799 ax-10 800 ax-11 801 ax-12 802 ax-13 804 ax-14 805 ax-16 922 ax-17 925 ax-ext 1074 ax-rep 1075 ax-pow 1077 ax-hilex 4983 ax-hvaddcl 4984 ax-hvzercl 4987 ax-hvmulcl 4989 |
| This theorem depends on definitions: df-bi 128 df-or 197 df-an 198 df-ex 679 df-sb 853 df-eu 1009 df-mo 1010 df-clab 1093 df-cleq 1097 df-clel 1099 df-ral 1205 df-rex 1206 df-rab 1208 df-v 1349 df-dif 1489 df-un 1490 df-in 1491 df-ss 1492 df-nul 1708 df-pw 1799 df-sn 1811 df-pr 1812 df-op 1815 df-uni 1920 df-int 1966 df-br 2063 df-opab 2098 df-id 2125 df-xp 2424 df-rel 2425 df-cnv 2426 df-co 2427 df-dm 2428 df-rn 2429 df-res 2430 df-ima 2431 df-fun 2432 df-fn 2433 df-f 2434 df-fv 2438 df-opr 3003 df-hlim 5107 df-sh 5114 df-ch 5127 df-span 5276 |