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| Mirrors > Home > MPE Home > Th. List > divsqrtsumo1 | Structured version Visualization version GIF version | ||
| Description: The sum Σ𝑛 ≤ 𝑥(1 / √𝑛) has the asymptotic expansion 2√𝑥 + 𝐿 + 𝑂(1 / √𝑥), for some 𝐿. (Contributed by Mario Carneiro, 10-May-2016.) |
| Ref | Expression |
|---|---|
| divsqrtsum.2 | ⊢ 𝐹 = (𝑥 ∈ ℝ+ ↦ (Σ𝑛 ∈ (1...(⌊‘𝑥))(1 / (√‘𝑛)) − (2 · (√‘𝑥)))) |
| divsqrsum2.1 | ⊢ (𝜑 → 𝐹 ⇝𝑟 𝐿) |
| Ref | Expression |
|---|---|
| divsqrtsumo1 | ⊢ (𝜑 → (𝑦 ∈ ℝ+ ↦ (((𝐹‘𝑦) − 𝐿) · (√‘𝑦))) ∈ 𝑂(1)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | rpssre 13050 | . . 3 ⊢ ℝ+ ⊆ ℝ | |
| 2 | 1 | a1i 11 | . 2 ⊢ (𝜑 → ℝ+ ⊆ ℝ) |
| 3 | divsqrtsum.2 | . . . . . . 7 ⊢ 𝐹 = (𝑥 ∈ ℝ+ ↦ (Σ𝑛 ∈ (1...(⌊‘𝑥))(1 / (√‘𝑛)) − (2 · (√‘𝑥)))) | |
| 4 | 3 | divsqrsumf 27217 | . . . . . 6 ⊢ 𝐹:ℝ+⟶ℝ |
| 5 | 4 | ffvelcdmi 7076 | . . . . 5 ⊢ (𝑦 ∈ ℝ+ → (𝐹‘𝑦) ∈ ℝ) |
| 6 | rpsup 13927 | . . . . . . 7 ⊢ sup(ℝ+, ℝ*, < ) = +∞ | |
| 7 | 6 | a1i 11 | . . . . . 6 ⊢ (𝜑 → sup(ℝ+, ℝ*, < ) = +∞) |
| 8 | 4 | a1i 11 | . . . . . . . 8 ⊢ (𝜑 → 𝐹:ℝ+⟶ℝ) |
| 9 | 8 | feqmptd 6946 | . . . . . . 7 ⊢ (𝜑 → 𝐹 = (𝑦 ∈ ℝ+ ↦ (𝐹‘𝑦))) |
| 10 | divsqrsum2.1 | . . . . . . 7 ⊢ (𝜑 → 𝐹 ⇝𝑟 𝐿) | |
| 11 | 9, 10 | eqbrtrrd 5129 | . . . . . 6 ⊢ (𝜑 → (𝑦 ∈ ℝ+ ↦ (𝐹‘𝑦)) ⇝𝑟 𝐿) |
| 12 | 5 | adantl 487 | . . . . . 6 ⊢ ((𝜑 ∧ 𝑦 ∈ ℝ+) → (𝐹‘𝑦) ∈ ℝ) |
| 13 | 7, 11, 12 | rlimrecl 15667 | . . . . 5 ⊢ (𝜑 → 𝐿 ∈ ℝ) |
| 14 | resubcl 11546 | . . . . 5 ⊢ (((𝐹‘𝑦) ∈ ℝ ∧ 𝐿 ∈ ℝ) → ((𝐹‘𝑦) − 𝐿) ∈ ℝ) | |
| 15 | 5, 13, 14 | syl2anr 609 | . . . 4 ⊢ ((𝜑 ∧ 𝑦 ∈ ℝ+) → ((𝐹‘𝑦) − 𝐿) ∈ ℝ) |
| 16 | 15 | recnd 11261 | . . 3 ⊢ ((𝜑 ∧ 𝑦 ∈ ℝ+) → ((𝐹‘𝑦) − 𝐿) ∈ ℂ) |
| 17 | rpsqrtcl 15351 | . . . . 5 ⊢ (𝑦 ∈ ℝ+ → (√‘𝑦) ∈ ℝ+) | |
| 18 | 17 | adantl 487 | . . . 4 ⊢ ((𝜑 ∧ 𝑦 ∈ ℝ+) → (√‘𝑦) ∈ ℝ+) |
| 19 | 18 | rpcnd 13088 | . . 3 ⊢ ((𝜑 ∧ 𝑦 ∈ ℝ+) → (√‘𝑦) ∈ ℂ) |
| 20 | 16, 19 | mulcld 11253 | . 2 ⊢ ((𝜑 ∧ 𝑦 ∈ ℝ+) → (((𝐹‘𝑦) − 𝐿) · (√‘𝑦)) ∈ ℂ) |
| 21 | 1red 11233 | . 2 ⊢ (𝜑 → 1 ∈ ℝ) | |
| 22 | 16, 19 | absmuld 15544 | . . . . 5 ⊢ ((𝜑 ∧ 𝑦 ∈ ℝ+) → (abs‘(((𝐹‘𝑦) − 𝐿) · (√‘𝑦))) = ((abs‘((𝐹‘𝑦) − 𝐿)) · (abs‘(√‘𝑦)))) |
| 23 | 18 | rprege0d 13093 | . . . . . . 7 ⊢ ((𝜑 ∧ 𝑦 ∈ ℝ+) → ((√‘𝑦) ∈ ℝ ∧ 0 ≤ (√‘𝑦))) |
| 24 | absid 15383 | . . . . . . 7 ⊢ (((√‘𝑦) ∈ ℝ ∧ 0 ≤ (√‘𝑦)) → (abs‘(√‘𝑦)) = (√‘𝑦)) | |
| 25 | 23, 24 | syl 18 | . . . . . 6 ⊢ ((𝜑 ∧ 𝑦 ∈ ℝ+) → (abs‘(√‘𝑦)) = (√‘𝑦)) |
| 26 | 25 | oveq2d 7429 | . . . . 5 ⊢ ((𝜑 ∧ 𝑦 ∈ ℝ+) → ((abs‘((𝐹‘𝑦) − 𝐿)) · (abs‘(√‘𝑦))) = ((abs‘((𝐹‘𝑦) − 𝐿)) · (√‘𝑦))) |
| 27 | 22, 26 | eqtrd 2795 | . . . 4 ⊢ ((𝜑 ∧ 𝑦 ∈ ℝ+) → (abs‘(((𝐹‘𝑦) − 𝐿) · (√‘𝑦))) = ((abs‘((𝐹‘𝑦) − 𝐿)) · (√‘𝑦))) |
| 28 | 3, 10 | divsqrtsum2 27219 | . . . . 5 ⊢ ((𝜑 ∧ 𝑦 ∈ ℝ+) → (abs‘((𝐹‘𝑦) − 𝐿)) ≤ (1 / (√‘𝑦))) |
| 29 | 16 | abscld 15526 | . . . . . 6 ⊢ ((𝜑 ∧ 𝑦 ∈ ℝ+) → (abs‘((𝐹‘𝑦) − 𝐿)) ∈ ℝ) |
| 30 | 1red 11233 | . . . . . 6 ⊢ ((𝜑 ∧ 𝑦 ∈ ℝ+) → 1 ∈ ℝ) | |
| 31 | 29, 30, 18 | lemuldivd 13135 | . . . . 5 ⊢ ((𝜑 ∧ 𝑦 ∈ ℝ+) → (((abs‘((𝐹‘𝑦) − 𝐿)) · (√‘𝑦)) ≤ 1 ↔ (abs‘((𝐹‘𝑦) − 𝐿)) ≤ (1 / (√‘𝑦)))) |
| 32 | 28, 31 | mpbird 260 | . . . 4 ⊢ ((𝜑 ∧ 𝑦 ∈ ℝ+) → ((abs‘((𝐹‘𝑦) − 𝐿)) · (√‘𝑦)) ≤ 1) |
| 33 | 27, 32 | eqbrtrd 5127 | . . 3 ⊢ ((𝜑 ∧ 𝑦 ∈ ℝ+) → (abs‘(((𝐹‘𝑦) − 𝐿) · (√‘𝑦))) ≤ 1) |
| 34 | 33 | adantrr 730 | . 2 ⊢ ((𝜑 ∧ (𝑦 ∈ ℝ+ ∧ 1 ≤ 𝑦)) → (abs‘(((𝐹‘𝑦) − 𝐿) · (√‘𝑦))) ≤ 1) |
| 35 | 2, 20, 21, 21, 34 | elo1d 15623 | 1 ⊢ (𝜑 → (𝑦 ∈ ℝ+ ↦ (((𝐹‘𝑦) − 𝐿) · (√‘𝑦))) ∈ 𝑂(1)) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∧ wa 401 = wceq 1570 ∈ wcel 2145 ⊆ wss 3899 class class class wbr 5103 ↦ cmpt 5186 ⟶wf 6529 ‘cfv 6533 (class class class)co 7413 supcsup 9410 ℝcr 11123 0cc0 11124 1c1 11125 · cmul 11129 +∞cpnf 11264 ℝ*cxr 11266 < clt 11267 ≤ cle 11268 − cmin 11465 / cdiv 11895 2c2 12319 ℝ+crp 13042 ...cfz 13561 ⌊cfl 13851 √csqrt 15320 abscabs 15321 ⇝𝑟 crli 15572 𝑂(1)co1 15573 Σcsu 15773 |
| 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-rep 5232 ax-sep 5251 ax-nul 5263 ax-pow 5330 ax-pr 5398 ax-un 7736 ax-inf2 9620 ax-cnex 11180 ax-resscn 11181 ax-1cn 11182 ax-icn 11183 ax-addcl 11184 ax-addrcl 11185 ax-mulcl 11186 ax-mulrcl 11187 ax-mulcom 11188 ax-addass 11189 ax-mulass 11190 ax-distr 11191 ax-i2m1 11192 ax-1ne0 11193 ax-1rid 11194 ax-rnegex 11195 ax-rrecex 11196 ax-cnre 11197 ax-pre-lttri 11198 ax-pre-lttrn 11199 ax-pre-ltadd 11200 ax-pre-mulgt0 11201 ax-pre-sup 11202 ax-addf 11203 |
| 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-tp 4589 df-op 4591 df-uni 4868 df-int 4908 df-iun 4953 df-iin 4954 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-se 5609 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 6299 df-ord 6360 df-on 6361 df-lim 6362 df-suc 6363 df-iota 6489 df-fun 6535 df-fn 6536 df-f 6537 df-f1 6538 df-fo 6539 df-f1o 6540 df-fv 6541 df-isom 6542 df-riota 7370 df-ov 7416 df-oprab 7417 df-mpo 7418 df-of 7678 df-om 7863 df-1st 7986 df-2nd 7987 df-supp 8159 df-frecs 8280 df-wrecs 8311 df-recs 8360 df-rdg 8399 df-1o 8455 df-2o 8456 df-er 8696 df-map 8828 df-pm 8829 df-ixp 8905 df-en 8953 df-dom 8954 df-sdom 8955 df-fin 8956 df-fsupp 9332 df-fi 9381 df-sup 9412 df-inf 9413 df-oi 9482 df-card 9944 df-pnf 11269 df-mnf 11270 df-xr 11271 df-ltxr 11272 df-le 11273 df-sub 11467 df-neg 11468 df-div 11896 df-nn 12258 df-2 12327 df-3 12328 df-4 12329 df-5 12330 df-6 12331 df-7 12332 df-8 12333 df-9 12334 df-n0 12529 df-z 12616 df-dec 12737 df-uz 12888 df-q 12998 df-rp 13043 df-xneg 13163 df-xadd 13164 df-xmul 13165 df-ioo 13402 df-ioc 13403 df-ico 13404 df-icc 13405 df-fz 13562 df-fzo 13710 df-fl 13853 df-mod 13931 df-seq 14066 df-exp 14126 df-fac 14338 df-bc 14367 df-hash 14395 df-shft 15140 df-cj 15186 df-re 15187 df-im 15188 df-sqrt 15322 df-abs 15323 df-limsup 15558 df-clim 15575 df-rlim 15576 df-o1 15577 df-lo1 15578 df-sum 15774 df-ef 16153 df-sin 16155 df-cos 16156 df-pi 16158 df-struct 17239 df-sets 17256 df-slot 17274 df-ndx 17286 df-base 17302 df-ress 17323 df-plusg 17355 df-mulr 17356 df-starv 17357 df-sca 17358 df-vsca 17359 df-ip 17360 df-tset 17361 df-ple 17362 df-ds 17364 df-unif 17365 df-hom 17366 df-cco 17367 df-rest 17507 df-topn 17508 df-0g 17526 df-gsum 17527 df-topgen 17528 df-pt 17529 df-prds 17532 df-xrs 17588 df-qtop 17593 df-imas 17594 df-xps 17596 df-mre 17670 df-mrc 17671 df-acs 17673 df-mgm 18730 df-sgrp 18821 df-mnd 18837 df-submnd 18892 df-mulg 19191 df-cntz 19444 df-cmn 19909 df-psmet 21577 df-xmet 21578 df-met 21579 df-bl 21580 df-mopn 21581 df-fbas 21582 df-fg 21583 df-cnfld 21586 df-top 23119 df-topon 23136 df-topsp 23158 df-bases 23171 df-cld 23244 df-ntr 23245 df-cls 23246 df-nei 23323 df-lp 23361 df-perf 23362 df-cn 23452 df-cnp 23453 df-haus 23540 df-cmp 23612 df-tx 23788 df-hmeo 23981 df-fil 24072 df-fm 24164 df-flim 24165 df-flf 24166 df-xms 24546 df-ms 24547 df-tms 24548 df-cncf 25106 df-limc 26093 df-dv 26094 df-log 26793 df-cxp 26794 |
| This theorem is used by: (None) |
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