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| Mirrors > Home > HSE Home > Th. List > nmcopexi | Structured version Visualization version GIF version | ||
| Description: The norm of a continuous linear Hilbert space operator exists. Theorem 3.5(i) of [Beran] p. 99. (Contributed by NM, 5-Feb-2006.) (Proof shortened by Mario Carneiro, 17-Nov-2013.) (New usage is discouraged.) |
| Ref | Expression |
|---|---|
| nmcopex.1 | ⊢ 𝑇 ∈ LinOp |
| nmcopex.2 | ⊢ 𝑇 ∈ ContOp |
| Ref | Expression |
|---|---|
| nmcopexi | ⊢ (normop‘𝑇) ∈ ℝ |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | nmcopex.2 | . . . 4 ⊢ 𝑇 ∈ ContOp | |
| 2 | ax-hv0cl 30965 | . . . 4 ⊢ 0ℎ ∈ ℋ | |
| 3 | 1rp 12915 | . . . 4 ⊢ 1 ∈ ℝ+ | |
| 4 | cnopc 31875 | . . . 4 ⊢ ((𝑇 ∈ ContOp ∧ 0ℎ ∈ ℋ ∧ 1 ∈ ℝ+) → ∃𝑦 ∈ ℝ+ ∀𝑧 ∈ ℋ ((normℎ‘(𝑧 −ℎ 0ℎ)) < 𝑦 → (normℎ‘((𝑇‘𝑧) −ℎ (𝑇‘0ℎ))) < 1)) | |
| 5 | 1, 2, 3, 4 | mp3an 1463 | . . 3 ⊢ ∃𝑦 ∈ ℝ+ ∀𝑧 ∈ ℋ ((normℎ‘(𝑧 −ℎ 0ℎ)) < 𝑦 → (normℎ‘((𝑇‘𝑧) −ℎ (𝑇‘0ℎ))) < 1) |
| 6 | hvsub0 31038 | . . . . . . . 8 ⊢ (𝑧 ∈ ℋ → (𝑧 −ℎ 0ℎ) = 𝑧) | |
| 7 | 6 | fveq2d 6830 | . . . . . . 7 ⊢ (𝑧 ∈ ℋ → (normℎ‘(𝑧 −ℎ 0ℎ)) = (normℎ‘𝑧)) |
| 8 | 7 | breq1d 5105 | . . . . . 6 ⊢ (𝑧 ∈ ℋ → ((normℎ‘(𝑧 −ℎ 0ℎ)) < 𝑦 ↔ (normℎ‘𝑧) < 𝑦)) |
| 9 | nmcopex.1 | . . . . . . . . . . 11 ⊢ 𝑇 ∈ LinOp | |
| 10 | 9 | lnop0i 31932 | . . . . . . . . . 10 ⊢ (𝑇‘0ℎ) = 0ℎ |
| 11 | 10 | oveq2i 7364 | . . . . . . . . 9 ⊢ ((𝑇‘𝑧) −ℎ (𝑇‘0ℎ)) = ((𝑇‘𝑧) −ℎ 0ℎ) |
| 12 | 9 | lnopfi 31931 | . . . . . . . . . . 11 ⊢ 𝑇: ℋ⟶ ℋ |
| 13 | 12 | ffvelcdmi 7021 | . . . . . . . . . 10 ⊢ (𝑧 ∈ ℋ → (𝑇‘𝑧) ∈ ℋ) |
| 14 | hvsub0 31038 | . . . . . . . . . 10 ⊢ ((𝑇‘𝑧) ∈ ℋ → ((𝑇‘𝑧) −ℎ 0ℎ) = (𝑇‘𝑧)) | |
| 15 | 13, 14 | syl 17 | . . . . . . . . 9 ⊢ (𝑧 ∈ ℋ → ((𝑇‘𝑧) −ℎ 0ℎ) = (𝑇‘𝑧)) |
| 16 | 11, 15 | eqtrid 2776 | . . . . . . . 8 ⊢ (𝑧 ∈ ℋ → ((𝑇‘𝑧) −ℎ (𝑇‘0ℎ)) = (𝑇‘𝑧)) |
| 17 | 16 | fveq2d 6830 | . . . . . . 7 ⊢ (𝑧 ∈ ℋ → (normℎ‘((𝑇‘𝑧) −ℎ (𝑇‘0ℎ))) = (normℎ‘(𝑇‘𝑧))) |
| 18 | 17 | breq1d 5105 | . . . . . 6 ⊢ (𝑧 ∈ ℋ → ((normℎ‘((𝑇‘𝑧) −ℎ (𝑇‘0ℎ))) < 1 ↔ (normℎ‘(𝑇‘𝑧)) < 1)) |
| 19 | 8, 18 | imbi12d 344 | . . . . 5 ⊢ (𝑧 ∈ ℋ → (((normℎ‘(𝑧 −ℎ 0ℎ)) < 𝑦 → (normℎ‘((𝑇‘𝑧) −ℎ (𝑇‘0ℎ))) < 1) ↔ ((normℎ‘𝑧) < 𝑦 → (normℎ‘(𝑇‘𝑧)) < 1))) |
| 20 | 19 | ralbiia 3073 | . . . 4 ⊢ (∀𝑧 ∈ ℋ ((normℎ‘(𝑧 −ℎ 0ℎ)) < 𝑦 → (normℎ‘((𝑇‘𝑧) −ℎ (𝑇‘0ℎ))) < 1) ↔ ∀𝑧 ∈ ℋ ((normℎ‘𝑧) < 𝑦 → (normℎ‘(𝑇‘𝑧)) < 1)) |
| 21 | 20 | rexbii 3076 | . . 3 ⊢ (∃𝑦 ∈ ℝ+ ∀𝑧 ∈ ℋ ((normℎ‘(𝑧 −ℎ 0ℎ)) < 𝑦 → (normℎ‘((𝑇‘𝑧) −ℎ (𝑇‘0ℎ))) < 1) ↔ ∃𝑦 ∈ ℝ+ ∀𝑧 ∈ ℋ ((normℎ‘𝑧) < 𝑦 → (normℎ‘(𝑇‘𝑧)) < 1)) |
| 22 | 5, 21 | mpbi 230 | . 2 ⊢ ∃𝑦 ∈ ℝ+ ∀𝑧 ∈ ℋ ((normℎ‘𝑧) < 𝑦 → (normℎ‘(𝑇‘𝑧)) < 1) |
| 23 | nmopval 31818 | . . 3 ⊢ (𝑇: ℋ⟶ ℋ → (normop‘𝑇) = sup({𝑚 ∣ ∃𝑥 ∈ ℋ ((normℎ‘𝑥) ≤ 1 ∧ 𝑚 = (normℎ‘(𝑇‘𝑥)))}, ℝ*, < )) | |
| 24 | 12, 23 | ax-mp 5 | . 2 ⊢ (normop‘𝑇) = sup({𝑚 ∣ ∃𝑥 ∈ ℋ ((normℎ‘𝑥) ≤ 1 ∧ 𝑚 = (normℎ‘(𝑇‘𝑥)))}, ℝ*, < ) |
| 25 | 12 | ffvelcdmi 7021 | . . 3 ⊢ (𝑥 ∈ ℋ → (𝑇‘𝑥) ∈ ℋ) |
| 26 | normcl 31087 | . . 3 ⊢ ((𝑇‘𝑥) ∈ ℋ → (normℎ‘(𝑇‘𝑥)) ∈ ℝ) | |
| 27 | 25, 26 | syl 17 | . 2 ⊢ (𝑥 ∈ ℋ → (normℎ‘(𝑇‘𝑥)) ∈ ℝ) |
| 28 | 10 | fveq2i 6829 | . . 3 ⊢ (normℎ‘(𝑇‘0ℎ)) = (normℎ‘0ℎ) |
| 29 | norm0 31090 | . . 3 ⊢ (normℎ‘0ℎ) = 0 | |
| 30 | 28, 29 | eqtri 2752 | . 2 ⊢ (normℎ‘(𝑇‘0ℎ)) = 0 |
| 31 | rpcn 12922 | . . . . 5 ⊢ ((𝑦 / 2) ∈ ℝ+ → (𝑦 / 2) ∈ ℂ) | |
| 32 | 9 | lnopmuli 31934 | . . . . 5 ⊢ (((𝑦 / 2) ∈ ℂ ∧ 𝑥 ∈ ℋ) → (𝑇‘((𝑦 / 2) ·ℎ 𝑥)) = ((𝑦 / 2) ·ℎ (𝑇‘𝑥))) |
| 33 | 31, 32 | sylan 580 | . . . 4 ⊢ (((𝑦 / 2) ∈ ℝ+ ∧ 𝑥 ∈ ℋ) → (𝑇‘((𝑦 / 2) ·ℎ 𝑥)) = ((𝑦 / 2) ·ℎ (𝑇‘𝑥))) |
| 34 | 33 | fveq2d 6830 | . . 3 ⊢ (((𝑦 / 2) ∈ ℝ+ ∧ 𝑥 ∈ ℋ) → (normℎ‘(𝑇‘((𝑦 / 2) ·ℎ 𝑥))) = (normℎ‘((𝑦 / 2) ·ℎ (𝑇‘𝑥)))) |
| 35 | norm-iii 31102 | . . . 4 ⊢ (((𝑦 / 2) ∈ ℂ ∧ (𝑇‘𝑥) ∈ ℋ) → (normℎ‘((𝑦 / 2) ·ℎ (𝑇‘𝑥))) = ((abs‘(𝑦 / 2)) · (normℎ‘(𝑇‘𝑥)))) | |
| 36 | 31, 25, 35 | syl2an 596 | . . 3 ⊢ (((𝑦 / 2) ∈ ℝ+ ∧ 𝑥 ∈ ℋ) → (normℎ‘((𝑦 / 2) ·ℎ (𝑇‘𝑥))) = ((abs‘(𝑦 / 2)) · (normℎ‘(𝑇‘𝑥)))) |
| 37 | rpre 12920 | . . . . . 6 ⊢ ((𝑦 / 2) ∈ ℝ+ → (𝑦 / 2) ∈ ℝ) | |
| 38 | rpge0 12925 | . . . . . 6 ⊢ ((𝑦 / 2) ∈ ℝ+ → 0 ≤ (𝑦 / 2)) | |
| 39 | 37, 38 | absidd 15348 | . . . . 5 ⊢ ((𝑦 / 2) ∈ ℝ+ → (abs‘(𝑦 / 2)) = (𝑦 / 2)) |
| 40 | 39 | adantr 480 | . . . 4 ⊢ (((𝑦 / 2) ∈ ℝ+ ∧ 𝑥 ∈ ℋ) → (abs‘(𝑦 / 2)) = (𝑦 / 2)) |
| 41 | 40 | oveq1d 7368 | . . 3 ⊢ (((𝑦 / 2) ∈ ℝ+ ∧ 𝑥 ∈ ℋ) → ((abs‘(𝑦 / 2)) · (normℎ‘(𝑇‘𝑥))) = ((𝑦 / 2) · (normℎ‘(𝑇‘𝑥)))) |
| 42 | 34, 36, 41 | 3eqtrrd 2769 | . 2 ⊢ (((𝑦 / 2) ∈ ℝ+ ∧ 𝑥 ∈ ℋ) → ((𝑦 / 2) · (normℎ‘(𝑇‘𝑥))) = (normℎ‘(𝑇‘((𝑦 / 2) ·ℎ 𝑥)))) |
| 43 | 22, 24, 27, 30, 42 | nmcexi 31988 | 1 ⊢ (normop‘𝑇) ∈ ℝ |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 395 = wceq 1540 ∈ wcel 2109 {cab 2707 ∀wral 3044 ∃wrex 3053 class class class wbr 5095 ⟶wf 6482 ‘cfv 6486 (class class class)co 7353 supcsup 9349 ℂcc 11026 ℝcr 11027 0cc0 11028 1c1 11029 · cmul 11033 ℝ*cxr 11167 < clt 11168 ≤ cle 11169 / cdiv 11795 2c2 12201 ℝ+crp 12911 abscabs 15159 ℋchba 30881 ·ℎ csm 30883 normℎcno 30885 0ℎc0v 30886 −ℎ cmv 30887 normopcnop 30907 ContOpccop 30908 LinOpclo 30909 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2008 ax-8 2111 ax-9 2119 ax-10 2142 ax-11 2158 ax-12 2178 ax-ext 2701 ax-sep 5238 ax-nul 5248 ax-pow 5307 ax-pr 5374 ax-un 7675 ax-cnex 11084 ax-resscn 11085 ax-1cn 11086 ax-icn 11087 ax-addcl 11088 ax-addrcl 11089 ax-mulcl 11090 ax-mulrcl 11091 ax-mulcom 11092 ax-addass 11093 ax-mulass 11094 ax-distr 11095 ax-i2m1 11096 ax-1ne0 11097 ax-1rid 11098 ax-rnegex 11099 ax-rrecex 11100 ax-cnre 11101 ax-pre-lttri 11102 ax-pre-lttrn 11103 ax-pre-ltadd 11104 ax-pre-mulgt0 11105 ax-pre-sup 11106 ax-hilex 30961 ax-hfvadd 30962 ax-hvass 30964 ax-hv0cl 30965 ax-hvaddid 30966 ax-hfvmul 30967 ax-hvmulid 30968 ax-hvmulass 30969 ax-hvdistr2 30971 ax-hvmul0 30972 ax-hfi 31041 ax-his1 31044 ax-his3 31046 ax-his4 31047 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2066 df-mo 2533 df-eu 2562 df-clab 2708 df-cleq 2721 df-clel 2803 df-nfc 2878 df-ne 2926 df-nel 3030 df-ral 3045 df-rex 3054 df-rmo 3345 df-reu 3346 df-rab 3397 df-v 3440 df-sbc 3745 df-csb 3854 df-dif 3908 df-un 3910 df-in 3912 df-ss 3922 df-pss 3925 df-nul 4287 df-if 4479 df-pw 4555 df-sn 4580 df-pr 4582 df-op 4586 df-uni 4862 df-iun 4946 df-br 5096 df-opab 5158 df-mpt 5177 df-tr 5203 df-id 5518 df-eprel 5523 df-po 5531 df-so 5532 df-fr 5576 df-we 5578 df-xp 5629 df-rel 5630 df-cnv 5631 df-co 5632 df-dm 5633 df-rn 5634 df-res 5635 df-ima 5636 df-pred 6253 df-ord 6314 df-on 6315 df-lim 6316 df-suc 6317 df-iota 6442 df-fun 6488 df-fn 6489 df-f 6490 df-f1 6491 df-fo 6492 df-f1o 6493 df-fv 6494 df-riota 7310 df-ov 7356 df-oprab 7357 df-mpo 7358 df-om 7807 df-2nd 7932 df-frecs 8221 df-wrecs 8252 df-recs 8301 df-rdg 8339 df-er 8632 df-map 8762 df-en 8880 df-dom 8881 df-sdom 8882 df-sup 9351 df-pnf 11170 df-mnf 11171 df-xr 11172 df-ltxr 11173 df-le 11174 df-sub 11367 df-neg 11368 df-div 11796 df-nn 12147 df-2 12209 df-3 12210 df-n0 12403 df-z 12490 df-uz 12754 df-rp 12912 df-seq 13927 df-exp 13987 df-cj 15024 df-re 15025 df-im 15026 df-sqrt 15160 df-abs 15161 df-hnorm 30930 df-hvsub 30933 df-nmop 31801 df-cnop 31802 df-lnop 31803 |
| This theorem is referenced by: nmcoplbi 31990 nmcopex 31991 cnlnadjlem2 32030 cnlnadjlem7 32035 cnlnadjlem8 32036 |
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