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| Mirrors > Home > HSE Home > Th. List > lnfncon | Structured version Visualization version GIF version | ||
| Description: A condition equivalent to "𝑇 is continuous" when 𝑇 is linear. Theorem 3.5(iii) of [Beran] p. 99. (Contributed by NM, 16-Feb-2006.) (New usage is discouraged.) |
| Ref | Expression |
|---|---|
| lnfncon | ⊢ (𝑇 ∈ LinFn → (𝑇 ∈ ContFn ↔ ∃𝑥 ∈ ℝ ∀𝑦 ∈ ℋ (abs‘(𝑇‘𝑦)) ≤ (𝑥 · (normℎ‘𝑦)))) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eleq1 2849 | . . 3 ⊢ (𝑇 = if(𝑇 ∈ LinFn, 𝑇, ( ℋ × {0})) → (𝑇 ∈ ContFn ↔ if(𝑇 ∈ LinFn, 𝑇, ( ℋ × {0})) ∈ ContFn)) | |
| 2 | fveq1 6884 | . . . . . 6 ⊢ (𝑇 = if(𝑇 ∈ LinFn, 𝑇, ( ℋ × {0})) → (𝑇‘𝑦) = (if(𝑇 ∈ LinFn, 𝑇, ( ℋ × {0}))‘𝑦)) | |
| 3 | 2 | fveq2d 6889 | . . . . 5 ⊢ (𝑇 = if(𝑇 ∈ LinFn, 𝑇, ( ℋ × {0})) → (abs‘(𝑇‘𝑦)) = (abs‘(if(𝑇 ∈ LinFn, 𝑇, ( ℋ × {0}))‘𝑦))) |
| 4 | 3 | breq1d 5113 | . . . 4 ⊢ (𝑇 = if(𝑇 ∈ LinFn, 𝑇, ( ℋ × {0})) → ((abs‘(𝑇‘𝑦)) ≤ (𝑥 · (normℎ‘𝑦)) ↔ (abs‘(if(𝑇 ∈ LinFn, 𝑇, ( ℋ × {0}))‘𝑦)) ≤ (𝑥 · (normℎ‘𝑦)))) |
| 5 | 4 | rexralbidv 3229 | . . 3 ⊢ (𝑇 = if(𝑇 ∈ LinFn, 𝑇, ( ℋ × {0})) → (∃𝑥 ∈ ℝ ∀𝑦 ∈ ℋ (abs‘(𝑇‘𝑦)) ≤ (𝑥 · (normℎ‘𝑦)) ↔ ∃𝑥 ∈ ℝ ∀𝑦 ∈ ℋ (abs‘(if(𝑇 ∈ LinFn, 𝑇, ( ℋ × {0}))‘𝑦)) ≤ (𝑥 · (normℎ‘𝑦)))) |
| 6 | 1, 5 | bibi12d 348 | . 2 ⊢ (𝑇 = if(𝑇 ∈ LinFn, 𝑇, ( ℋ × {0})) → ((𝑇 ∈ ContFn ↔ ∃𝑥 ∈ ℝ ∀𝑦 ∈ ℋ (abs‘(𝑇‘𝑦)) ≤ (𝑥 · (normℎ‘𝑦))) ↔ (if(𝑇 ∈ LinFn, 𝑇, ( ℋ × {0})) ∈ ContFn ↔ ∃𝑥 ∈ ℝ ∀𝑦 ∈ ℋ (abs‘(if(𝑇 ∈ LinFn, 𝑇, ( ℋ × {0}))‘𝑦)) ≤ (𝑥 · (normℎ‘𝑦))))) |
| 7 | 0lnfn 32587 | . . . 4 ⊢ ( ℋ × {0}) ∈ LinFn | |
| 8 | 7 | elimel 4552 | . . 3 ⊢ if(𝑇 ∈ LinFn, 𝑇, ( ℋ × {0})) ∈ LinFn |
| 9 | 8 | lnfnconi 32657 | . 2 ⊢ (if(𝑇 ∈ LinFn, 𝑇, ( ℋ × {0})) ∈ ContFn ↔ ∃𝑥 ∈ ℝ ∀𝑦 ∈ ℋ (abs‘(if(𝑇 ∈ LinFn, 𝑇, ( ℋ × {0}))‘𝑦)) ≤ (𝑥 · (normℎ‘𝑦))) |
| 10 | 6, 9 | dedth 4541 | 1 ⊢ (𝑇 ∈ LinFn → (𝑇 ∈ ContFn ↔ ∃𝑥 ∈ ℝ ∀𝑦 ∈ ℋ (abs‘(𝑇‘𝑦)) ≤ (𝑥 · (normℎ‘𝑦)))) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ↔ wb 209 = wceq 1570 ∈ wcel 2145 ∀wral 3077 ∃wrex 3087 ifcif 4482 {csn 4584 class class class wbr 5103 × cxp 5649 ‘cfv 6538 (class class class)co 7420 ℝcr 11199 0cc0 11200 · cmul 11205 ≤ cle 11344 abscabs 15401 ℋchba 31521 normℎcno 31525 ContFnccnfn 31555 LinFnclf 31556 |
| 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 2733 ax-sep 5249 ax-nul 5260 ax-pow 5327 ax-pr 5391 ax-un 7751 ax-cnex 11256 ax-resscn 11257 ax-1cn 11258 ax-icn 11259 ax-addcl 11260 ax-addrcl 11261 ax-mulcl 11262 ax-mulrcl 11263 ax-mulcom 11264 ax-addass 11265 ax-mulass 11266 ax-distr 11267 ax-i2m1 11268 ax-1ne0 11269 ax-1rid 11270 ax-rnegex 11271 ax-rrecex 11272 ax-cnre 11273 ax-pre-lttri 11274 ax-pre-lttrn 11275 ax-pre-ltadd 11276 ax-pre-mulgt0 11277 ax-pre-sup 11278 ax-hilex 31601 ax-hfvadd 31602 ax-hv0cl 31605 ax-hvaddid 31606 ax-hfvmul 31607 ax-hvmulid 31608 ax-hvmulass 31609 ax-hvmul0 31612 ax-hfi 31681 ax-his1 31684 ax-his3 31686 ax-his4 31687 |
| 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 2565 df-eu 2595 df-clab 2740 df-cleq 2753 df-clel 2836 df-nfc 2910 df-ne 2957 df-nel 3063 df-ral 3078 df-rex 3088 df-rmo 3366 df-reu 3367 df-rab 3414 df-v 3453 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 5546 df-eprel 5551 df-po 5559 df-so 5560 df-fr 5604 df-we 5606 df-xp 5657 df-rel 5658 df-cnv 5659 df-co 5660 df-dm 5661 df-rn 5662 df-res 5663 df-ima 5664 df-pred 6304 df-ord 6365 df-on 6366 df-lim 6367 df-suc 6368 df-iota 6494 df-fun 6540 df-fn 6541 df-f 6542 df-f1 6543 df-fo 6544 df-f1o 6545 df-fv 6546 df-riota 7377 df-ov 7423 df-oprab 7424 df-mpo 7425 df-om 7878 df-2nd 8002 df-frecs 8299 df-wrecs 8330 df-recs 8379 df-rdg 8418 df-er 8717 df-map 8849 df-en 8974 df-dom 8975 df-sdom 8976 df-sup 9434 df-pnf 11345 df-mnf 11346 df-xr 11347 df-ltxr 11348 df-le 11349 df-sub 11543 df-neg 11544 df-div 11974 df-nn 12336 df-2 12405 df-3 12406 df-n0 12607 df-z 12694 df-uz 12966 df-rp 13121 df-seq 14145 df-exp 14205 df-cj 15266 df-re 15267 df-im 15268 df-sqrt 15402 df-abs 15403 df-hnorm 31570 df-hvsub 31573 df-nmfn 32447 df-cnfn 32449 df-lnfn 32450 |
| This theorem is used by: lnfncnbd 32659 riesz1 32667 cnlnadjlem2 32670 |
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