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| Mirrors > Home > MPE Home > Th. List > climabs0 | Structured version Visualization version GIF version | ||
| Description: Convergence to zero of the absolute value is equivalent to convergence to zero. (Contributed by NM, 8-Jul-2008.) (Revised by Mario Carneiro, 31-Jan-2014.) |
| Ref | Expression |
|---|---|
| climabs0.1 | ⊢ 𝑍 = (ℤ≥‘𝑀) |
| climabs0.2 | ⊢ (𝜑 → 𝑀 ∈ ℤ) |
| climabs0.3 | ⊢ (𝜑 → 𝐹 ∈ 𝑉) |
| climabs0.4 | ⊢ (𝜑 → 𝐺 ∈ 𝑊) |
| climabs0.5 | ⊢ ((𝜑 ∧ 𝑘 ∈ 𝑍) → (𝐹‘𝑘) ∈ ℂ) |
| climabs0.6 | ⊢ ((𝜑 ∧ 𝑘 ∈ 𝑍) → (𝐺‘𝑘) = (abs‘(𝐹‘𝑘))) |
| Ref | Expression |
|---|---|
| climabs0 | ⊢ (𝜑 → (𝐹 ⇝ 0 ↔ 𝐺 ⇝ 0)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | climabs0.1 | . . . . . . . 8 ⊢ 𝑍 = (ℤ≥‘𝑀) | |
| 2 | 1 | uztrn2 12869 | . . . . . . 7 ⊢ ((𝑗 ∈ 𝑍 ∧ 𝑘 ∈ (ℤ≥‘𝑗)) → 𝑘 ∈ 𝑍) |
| 3 | climabs0.5 | . . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝑍) → (𝐹‘𝑘) ∈ ℂ) | |
| 4 | absidm 15363 | . . . . . . . . 9 ⊢ ((𝐹‘𝑘) ∈ ℂ → (abs‘(abs‘(𝐹‘𝑘))) = (abs‘(𝐹‘𝑘))) | |
| 5 | 3, 4 | syl 18 | . . . . . . . 8 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝑍) → (abs‘(abs‘(𝐹‘𝑘))) = (abs‘(𝐹‘𝑘))) |
| 6 | 5 | breq1d 5114 | . . . . . . 7 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝑍) → ((abs‘(abs‘(𝐹‘𝑘))) < 𝑥 ↔ (abs‘(𝐹‘𝑘)) < 𝑥)) |
| 7 | 2, 6 | sylan2 604 | . . . . . 6 ⊢ ((𝜑 ∧ (𝑗 ∈ 𝑍 ∧ 𝑘 ∈ (ℤ≥‘𝑗))) → ((abs‘(abs‘(𝐹‘𝑘))) < 𝑥 ↔ (abs‘(𝐹‘𝑘)) < 𝑥)) |
| 8 | 7 | anassrs 472 | . . . . 5 ⊢ (((𝜑 ∧ 𝑗 ∈ 𝑍) ∧ 𝑘 ∈ (ℤ≥‘𝑗)) → ((abs‘(abs‘(𝐹‘𝑘))) < 𝑥 ↔ (abs‘(𝐹‘𝑘)) < 𝑥)) |
| 9 | 8 | ralbidva 3186 | . . . 4 ⊢ ((𝜑 ∧ 𝑗 ∈ 𝑍) → (∀𝑘 ∈ (ℤ≥‘𝑗)(abs‘(abs‘(𝐹‘𝑘))) < 𝑥 ↔ ∀𝑘 ∈ (ℤ≥‘𝑗)(abs‘(𝐹‘𝑘)) < 𝑥)) |
| 10 | 9 | rexbidva 3187 | . . 3 ⊢ (𝜑 → (∃𝑗 ∈ 𝑍 ∀𝑘 ∈ (ℤ≥‘𝑗)(abs‘(abs‘(𝐹‘𝑘))) < 𝑥 ↔ ∃𝑗 ∈ 𝑍 ∀𝑘 ∈ (ℤ≥‘𝑗)(abs‘(𝐹‘𝑘)) < 𝑥)) |
| 11 | 10 | ralbidv 3188 | . 2 ⊢ (𝜑 → (∀𝑥 ∈ ℝ+ ∃𝑗 ∈ 𝑍 ∀𝑘 ∈ (ℤ≥‘𝑗)(abs‘(abs‘(𝐹‘𝑘))) < 𝑥 ↔ ∀𝑥 ∈ ℝ+ ∃𝑗 ∈ 𝑍 ∀𝑘 ∈ (ℤ≥‘𝑗)(abs‘(𝐹‘𝑘)) < 𝑥)) |
| 12 | climabs0.2 | . . 3 ⊢ (𝜑 → 𝑀 ∈ ℤ) | |
| 13 | climabs0.4 | . . 3 ⊢ (𝜑 → 𝐺 ∈ 𝑊) | |
| 14 | climabs0.6 | . . 3 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝑍) → (𝐺‘𝑘) = (abs‘(𝐹‘𝑘))) | |
| 15 | 3 | abscld 15478 | . . . 4 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝑍) → (abs‘(𝐹‘𝑘)) ∈ ℝ) |
| 16 | 15 | recnd 11225 | . . 3 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝑍) → (abs‘(𝐹‘𝑘)) ∈ ℂ) |
| 17 | 1, 12, 13, 14, 16 | clim0c 15546 | . 2 ⊢ (𝜑 → (𝐺 ⇝ 0 ↔ ∀𝑥 ∈ ℝ+ ∃𝑗 ∈ 𝑍 ∀𝑘 ∈ (ℤ≥‘𝑗)(abs‘(abs‘(𝐹‘𝑘))) < 𝑥)) |
| 18 | climabs0.3 | . . 3 ⊢ (𝜑 → 𝐹 ∈ 𝑉) | |
| 19 | eqidd 2766 | . . 3 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝑍) → (𝐹‘𝑘) = (𝐹‘𝑘)) | |
| 20 | 1, 12, 18, 19, 3 | clim0c 15546 | . 2 ⊢ (𝜑 → (𝐹 ⇝ 0 ↔ ∀𝑥 ∈ ℝ+ ∃𝑗 ∈ 𝑍 ∀𝑘 ∈ (ℤ≥‘𝑗)(abs‘(𝐹‘𝑘)) < 𝑥)) |
| 21 | 11, 17, 20 | 3bitr4rd 315 | 1 ⊢ (𝜑 → (𝐹 ⇝ 0 ↔ 𝐺 ⇝ 0)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ↔ wb 209 ∧ wa 400 = wceq 1563 ∈ wcel 2145 ∀wral 3079 ∃wrex 3089 class class class wbr 5104 ‘cfv 6525 ℂcc 11086 0cc0 11088 < clt 11231 ℤcz 12579 ℤ≥cuz 12850 ℝ+crp 13004 abscabs 15273 ⇝ cli 15523 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1818 ax-4 1832 ax-5 1933 ax-6 1990 ax-7 2031 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2215 ax-ext 2737 ax-sep 5250 ax-nul 5260 ax-pow 5326 ax-pr 5394 ax-un 7722 ax-cnex 11144 ax-resscn 11145 ax-1cn 11146 ax-icn 11147 ax-addcl 11148 ax-addrcl 11149 ax-mulcl 11150 ax-mulrcl 11151 ax-mulcom 11152 ax-addass 11153 ax-mulass 11154 ax-distr 11155 ax-i2m1 11156 ax-1ne0 11157 ax-1rid 11158 ax-rnegex 11159 ax-rrecex 11160 ax-cnre 11161 ax-pre-lttri 11162 ax-pre-lttrn 11163 ax-pre-ltadd 11164 ax-pre-mulgt0 11165 ax-pre-sup 11166 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3or 1102 df-3an 1103 df-tru 1566 df-fal 1576 df-ex 1803 df-nf 1807 df-sb 2094 df-mo 2569 df-eu 2599 df-clab 2744 df-cleq 2757 df-clel 2840 df-nfc 2914 df-ne 2961 df-nel 3065 df-ral 3080 df-rex 3090 df-rmo 3370 df-reu 3371 df-rab 3418 df-v 3459 df-sbc 3748 df-csb 3856 df-dif 3910 df-un 3912 df-in 3914 df-ss 3924 df-pss 3927 df-nul 4289 df-if 4484 df-pw 4560 df-sn 4586 df-pr 4588 df-op 4592 df-uni 4868 df-iun 4953 df-br 5105 df-opab 5167 df-mpt 5186 df-tr 5212 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 6291 df-ord 6352 df-on 6353 df-lim 6354 df-suc 6355 df-iota 6481 df-fun 6527 df-fn 6528 df-f 6529 df-f1 6530 df-fo 6531 df-f1o 6532 df-fv 6533 df-riota 7357 df-ov 7403 df-oprab 7404 df-mpo 7405 df-om 7851 df-2nd 7975 df-frecs 8266 df-wrecs 8297 df-recs 8346 df-rdg 8385 df-er 8682 df-en 8932 df-dom 8933 df-sdom 8934 df-sup 9390 df-pnf 11233 df-mnf 11234 df-xr 11235 df-ltxr 11236 df-le 11237 df-sub 11431 df-neg 11432 df-div 11860 df-nn 12222 df-2 12291 df-3 12292 df-n0 12493 df-z 12580 df-uz 12851 df-rp 13005 df-seq 14026 df-exp 14086 df-cj 15138 df-re 15139 df-im 15140 df-sqrt 15274 df-abs 15275 df-clim 15527 |
| This theorem is referenced by: expcnv 15906 explecnv 15907 plyeq0lem 26324 |
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