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| Mirrors > Home > HSE Home > Th. List > lnfncnbd | Structured version Visualization version GIF version | ||
| Description: A linear functional is continuous iff it is bounded. (Contributed by NM, 25-Apr-2006.) (New usage is discouraged.) |
| Ref | Expression |
|---|---|
| lnfncnbd | ⊢ (𝑇 ∈ LinFn → (𝑇 ∈ ContFn ↔ (normfn‘𝑇) ∈ ℝ)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | nmcfnex 32563 | . . 3 ⊢ ((𝑇 ∈ LinFn ∧ 𝑇 ∈ ContFn) → (normfn‘𝑇) ∈ ℝ) | |
| 2 | 1 | ex 418 | . 2 ⊢ (𝑇 ∈ LinFn → (𝑇 ∈ ContFn → (normfn‘𝑇) ∈ ℝ)) |
| 3 | simpr 490 | . . . . 5 ⊢ ((𝑇 ∈ LinFn ∧ (normfn‘𝑇) ∈ ℝ) → (normfn‘𝑇) ∈ ℝ) | |
| 4 | nmbdfnlb 32560 | . . . . . . 7 ⊢ ((𝑇 ∈ LinFn ∧ (normfn‘𝑇) ∈ ℝ ∧ 𝑦 ∈ ℋ) → (abs‘(𝑇‘𝑦)) ≤ ((normfn‘𝑇) · (normℎ‘𝑦))) | |
| 5 | 4 | 3expa 1136 | . . . . . 6 ⊢ (((𝑇 ∈ LinFn ∧ (normfn‘𝑇) ∈ ℝ) ∧ 𝑦 ∈ ℋ) → (abs‘(𝑇‘𝑦)) ≤ ((normfn‘𝑇) · (normℎ‘𝑦))) |
| 6 | 5 | ralrimiva 3154 | . . . . 5 ⊢ ((𝑇 ∈ LinFn ∧ (normfn‘𝑇) ∈ ℝ) → ∀𝑦 ∈ ℋ (abs‘(𝑇‘𝑦)) ≤ ((normfn‘𝑇) · (normℎ‘𝑦))) |
| 7 | oveq1 7422 | . . . . . . . 8 ⊢ (𝑥 = (normfn‘𝑇) → (𝑥 · (normℎ‘𝑦)) = ((normfn‘𝑇) · (normℎ‘𝑦))) | |
| 8 | 7 | breq2d 5115 | . . . . . . 7 ⊢ (𝑥 = (normfn‘𝑇) → ((abs‘(𝑇‘𝑦)) ≤ (𝑥 · (normℎ‘𝑦)) ↔ (abs‘(𝑇‘𝑦)) ≤ ((normfn‘𝑇) · (normℎ‘𝑦)))) |
| 9 | 8 | ralbidv 3185 | . . . . . 6 ⊢ (𝑥 = (normfn‘𝑇) → (∀𝑦 ∈ ℋ (abs‘(𝑇‘𝑦)) ≤ (𝑥 · (normℎ‘𝑦)) ↔ ∀𝑦 ∈ ℋ (abs‘(𝑇‘𝑦)) ≤ ((normfn‘𝑇) · (normℎ‘𝑦)))) |
| 10 | 9 | rspcev 3576 | . . . . 5 ⊢ (((normfn‘𝑇) ∈ ℝ ∧ ∀𝑦 ∈ ℋ (abs‘(𝑇‘𝑦)) ≤ ((normfn‘𝑇) · (normℎ‘𝑦))) → ∃𝑥 ∈ ℝ ∀𝑦 ∈ ℋ (abs‘(𝑇‘𝑦)) ≤ (𝑥 · (normℎ‘𝑦))) |
| 11 | 3, 6, 10 | syl2anc 596 | . . . 4 ⊢ ((𝑇 ∈ LinFn ∧ (normfn‘𝑇) ∈ ℝ) → ∃𝑥 ∈ ℝ ∀𝑦 ∈ ℋ (abs‘(𝑇‘𝑦)) ≤ (𝑥 · (normℎ‘𝑦))) |
| 12 | 11 | ex 418 | . . 3 ⊢ (𝑇 ∈ LinFn → ((normfn‘𝑇) ∈ ℝ → ∃𝑥 ∈ ℝ ∀𝑦 ∈ ℋ (abs‘(𝑇‘𝑦)) ≤ (𝑥 · (normℎ‘𝑦)))) |
| 13 | lnfncon 32566 | . . 3 ⊢ (𝑇 ∈ LinFn → (𝑇 ∈ ContFn ↔ ∃𝑥 ∈ ℝ ∀𝑦 ∈ ℋ (abs‘(𝑇‘𝑦)) ≤ (𝑥 · (normℎ‘𝑦)))) | |
| 14 | 12, 13 | sylibrd 262 | . 2 ⊢ (𝑇 ∈ LinFn → ((normfn‘𝑇) ∈ ℝ → 𝑇 ∈ ContFn)) |
| 15 | 2, 14 | impbid 215 | 1 ⊢ (𝑇 ∈ LinFn → (𝑇 ∈ ContFn ↔ (normfn‘𝑇) ∈ ℝ)) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ↔ wb 209 ∧ wa 401 = wceq 1570 ∈ wcel 2145 ∀wral 3076 ∃wrex 3086 class class class wbr 5103 ‘cfv 6534 (class class class)co 7415 ℝcr 11145 · cmul 11151 ≤ cle 11290 abscabs 15343 ℋchba 31429 normℎcno 31433 normfncnmf 31461 ContFnccnfn 31463 LinFnclf 31464 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2213 ax-ext 2732 ax-sep 5251 ax-nul 5263 ax-pow 5330 ax-pr 5398 ax-un 7738 ax-cnex 11202 ax-resscn 11203 ax-1cn 11204 ax-icn 11205 ax-addcl 11206 ax-addrcl 11207 ax-mulcl 11208 ax-mulrcl 11209 ax-mulcom 11210 ax-addass 11211 ax-mulass 11212 ax-distr 11213 ax-i2m1 11214 ax-1ne0 11215 ax-1rid 11216 ax-rnegex 11217 ax-rrecex 11218 ax-cnre 11219 ax-pre-lttri 11220 ax-pre-lttrn 11221 ax-pre-ltadd 11222 ax-pre-mulgt0 11223 ax-pre-sup 11224 ax-hilex 31509 ax-hfvadd 31510 ax-hv0cl 31513 ax-hvaddid 31514 ax-hfvmul 31515 ax-hvmulid 31516 ax-hvmulass 31517 ax-hvmul0 31520 ax-hfi 31589 ax-his1 31592 ax-his3 31594 ax-his4 31595 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-nel 3062 df-ral 3077 df-rex 3087 df-rmo 3365 df-reu 3366 df-rab 3413 df-v 3452 df-sbc 3740 df-csb 3848 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-pss 3919 df-nul 4280 df-if 4483 df-pw 4559 df-sn 4585 df-pr 4587 df-op 4591 df-uni 4868 df-iun 4953 df-br 5104 df-opab 5168 df-mpt 5187 df-tr 5213 df-id 5550 df-eprel 5555 df-po 5563 df-so 5564 df-fr 5608 df-we 5610 df-xp 5661 df-rel 5662 df-cnv 5663 df-co 5664 df-dm 5665 df-rn 5666 df-res 5667 df-ima 5668 df-pred 6300 df-ord 6361 df-on 6362 df-lim 6363 df-suc 6364 df-iota 6490 df-fun 6536 df-fn 6537 df-f 6538 df-f1 6539 df-fo 6540 df-f1o 6541 df-fv 6542 df-riota 7372 df-ov 7418 df-oprab 7419 df-mpo 7420 df-om 7865 df-2nd 7989 df-frecs 8282 df-wrecs 8313 df-recs 8362 df-rdg 8401 df-er 8700 df-map 8832 df-en 8957 df-dom 8958 df-sdom 8959 df-sup 9416 df-pnf 11291 df-mnf 11292 df-xr 11293 df-ltxr 11294 df-le 11295 df-sub 11489 df-neg 11490 df-div 11918 df-nn 12280 df-2 12349 df-3 12350 df-n0 12551 df-z 12638 df-uz 12910 df-rp 13065 df-seq 14088 df-exp 14148 df-cj 15208 df-re 15209 df-im 15210 df-sqrt 15344 df-abs 15345 df-hnorm 31478 df-hvsub 31481 df-nmfn 32355 df-cnfn 32357 df-lnfn 32358 |
| This theorem is used by: riesz1 32575 riesz2 32576 rnbra 32617 |
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