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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 32143 | . . 3 ⊢ ((𝑇 ∈ LinFn ∧ 𝑇 ∈ ContFn) → (normfn‘𝑇) ∈ ℝ) | |
| 2 | 1 | ex 412 | . 2 ⊢ (𝑇 ∈ LinFn → (𝑇 ∈ ContFn → (normfn‘𝑇) ∈ ℝ)) |
| 3 | simpr 484 | . . . . 5 ⊢ ((𝑇 ∈ LinFn ∧ (normfn‘𝑇) ∈ ℝ) → (normfn‘𝑇) ∈ ℝ) | |
| 4 | nmbdfnlb 32140 | . . . . . . 7 ⊢ ((𝑇 ∈ LinFn ∧ (normfn‘𝑇) ∈ ℝ ∧ 𝑦 ∈ ℋ) → (abs‘(𝑇‘𝑦)) ≤ ((normfn‘𝑇) · (normℎ‘𝑦))) | |
| 5 | 4 | 3expa 1119 | . . . . . 6 ⊢ (((𝑇 ∈ LinFn ∧ (normfn‘𝑇) ∈ ℝ) ∧ 𝑦 ∈ ℋ) → (abs‘(𝑇‘𝑦)) ≤ ((normfn‘𝑇) · (normℎ‘𝑦))) |
| 6 | 5 | ralrimiva 3130 | . . . . 5 ⊢ ((𝑇 ∈ LinFn ∧ (normfn‘𝑇) ∈ ℝ) → ∀𝑦 ∈ ℋ (abs‘(𝑇‘𝑦)) ≤ ((normfn‘𝑇) · (normℎ‘𝑦))) |
| 7 | oveq1 7369 | . . . . . . . 8 ⊢ (𝑥 = (normfn‘𝑇) → (𝑥 · (normℎ‘𝑦)) = ((normfn‘𝑇) · (normℎ‘𝑦))) | |
| 8 | 7 | breq2d 5098 | . . . . . . 7 ⊢ (𝑥 = (normfn‘𝑇) → ((abs‘(𝑇‘𝑦)) ≤ (𝑥 · (normℎ‘𝑦)) ↔ (abs‘(𝑇‘𝑦)) ≤ ((normfn‘𝑇) · (normℎ‘𝑦)))) |
| 9 | 8 | ralbidv 3161 | . . . . . 6 ⊢ (𝑥 = (normfn‘𝑇) → (∀𝑦 ∈ ℋ (abs‘(𝑇‘𝑦)) ≤ (𝑥 · (normℎ‘𝑦)) ↔ ∀𝑦 ∈ ℋ (abs‘(𝑇‘𝑦)) ≤ ((normfn‘𝑇) · (normℎ‘𝑦)))) |
| 10 | 9 | rspcev 3565 | . . . . 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 585 | . . . 4 ⊢ ((𝑇 ∈ LinFn ∧ (normfn‘𝑇) ∈ ℝ) → ∃𝑥 ∈ ℝ ∀𝑦 ∈ ℋ (abs‘(𝑇‘𝑦)) ≤ (𝑥 · (normℎ‘𝑦))) |
| 12 | 11 | ex 412 | . . 3 ⊢ (𝑇 ∈ LinFn → ((normfn‘𝑇) ∈ ℝ → ∃𝑥 ∈ ℝ ∀𝑦 ∈ ℋ (abs‘(𝑇‘𝑦)) ≤ (𝑥 · (normℎ‘𝑦)))) |
| 13 | lnfncon 32146 | . . 3 ⊢ (𝑇 ∈ LinFn → (𝑇 ∈ ContFn ↔ ∃𝑥 ∈ ℝ ∀𝑦 ∈ ℋ (abs‘(𝑇‘𝑦)) ≤ (𝑥 · (normℎ‘𝑦)))) | |
| 14 | 12, 13 | sylibrd 259 | . 2 ⊢ (𝑇 ∈ LinFn → ((normfn‘𝑇) ∈ ℝ → 𝑇 ∈ ContFn)) |
| 15 | 2, 14 | impbid 212 | 1 ⊢ (𝑇 ∈ LinFn → (𝑇 ∈ ContFn ↔ (normfn‘𝑇) ∈ ℝ)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ↔ wb 206 ∧ wa 395 = wceq 1542 ∈ wcel 2114 ∀wral 3052 ∃wrex 3062 class class class wbr 5086 ‘cfv 6494 (class class class)co 7362 ℝcr 11032 · cmul 11038 ≤ cle 11175 abscabs 15191 ℋchba 31009 normℎcno 31013 normfncnmf 31041 ContFnccnfn 31043 LinFnclf 31044 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2709 ax-sep 5232 ax-nul 5242 ax-pow 5304 ax-pr 5372 ax-un 7684 ax-cnex 11089 ax-resscn 11090 ax-1cn 11091 ax-icn 11092 ax-addcl 11093 ax-addrcl 11094 ax-mulcl 11095 ax-mulrcl 11096 ax-mulcom 11097 ax-addass 11098 ax-mulass 11099 ax-distr 11100 ax-i2m1 11101 ax-1ne0 11102 ax-1rid 11103 ax-rnegex 11104 ax-rrecex 11105 ax-cnre 11106 ax-pre-lttri 11107 ax-pre-lttrn 11108 ax-pre-ltadd 11109 ax-pre-mulgt0 11110 ax-pre-sup 11111 ax-hilex 31089 ax-hfvadd 31090 ax-hv0cl 31093 ax-hvaddid 31094 ax-hfvmul 31095 ax-hvmulid 31096 ax-hvmulass 31097 ax-hvmul0 31100 ax-hfi 31169 ax-his1 31172 ax-his3 31174 ax-his4 31175 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2540 df-eu 2570 df-clab 2716 df-cleq 2729 df-clel 2812 df-nfc 2886 df-ne 2934 df-nel 3038 df-ral 3053 df-rex 3063 df-rmo 3343 df-reu 3344 df-rab 3391 df-v 3432 df-sbc 3730 df-csb 3839 df-dif 3893 df-un 3895 df-in 3897 df-ss 3907 df-pss 3910 df-nul 4275 df-if 4468 df-pw 4544 df-sn 4569 df-pr 4571 df-op 4575 df-uni 4852 df-iun 4936 df-br 5087 df-opab 5149 df-mpt 5168 df-tr 5194 df-id 5521 df-eprel 5526 df-po 5534 df-so 5535 df-fr 5579 df-we 5581 df-xp 5632 df-rel 5633 df-cnv 5634 df-co 5635 df-dm 5636 df-rn 5637 df-res 5638 df-ima 5639 df-pred 6261 df-ord 6322 df-on 6323 df-lim 6324 df-suc 6325 df-iota 6450 df-fun 6496 df-fn 6497 df-f 6498 df-f1 6499 df-fo 6500 df-f1o 6501 df-fv 6502 df-riota 7319 df-ov 7365 df-oprab 7366 df-mpo 7367 df-om 7813 df-2nd 7938 df-frecs 8226 df-wrecs 8257 df-recs 8306 df-rdg 8344 df-er 8638 df-map 8770 df-en 8889 df-dom 8890 df-sdom 8891 df-sup 9350 df-pnf 11176 df-mnf 11177 df-xr 11178 df-ltxr 11179 df-le 11180 df-sub 11374 df-neg 11375 df-div 11803 df-nn 12170 df-2 12239 df-3 12240 df-n0 12433 df-z 12520 df-uz 12784 df-rp 12938 df-seq 13959 df-exp 14019 df-cj 15056 df-re 15057 df-im 15058 df-sqrt 15192 df-abs 15193 df-hnorm 31058 df-hvsub 31061 df-nmfn 31935 df-cnfn 31937 df-lnfn 31938 |
| This theorem is referenced by: riesz1 32155 riesz2 32156 rnbra 32197 |
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