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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 13040 | . . 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 27196 | . . . . . 6 ⊢ 𝐹:ℝ+⟶ℝ |
| 5 | 4 | ffvelcdmi 7082 | . . . . 5 ⊢ (𝑦 ∈ ℝ+ → (𝐹‘𝑦) ∈ ℝ) |
| 6 | rpsup 13917 | . . . . . . 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 6953 | . . . . . . 7 ⊢ (𝜑 → 𝐹 = (𝑦 ∈ ℝ+ ↦ (𝐹‘𝑦))) |
| 10 | divsqrsum2.1 | . . . . . . 7 ⊢ (𝜑 → 𝐹 ⇝𝑟 𝐿) | |
| 11 | 9, 10 | eqbrtrrd 5137 | . . . . . 6 ⊢ (𝜑 → (𝑦 ∈ ℝ+ ↦ (𝐹‘𝑦)) ⇝𝑟 𝐿) |
| 12 | 5 | adantl 487 | . . . . . 6 ⊢ ((𝜑 ∧ 𝑦 ∈ ℝ+) → (𝐹‘𝑦) ∈ ℝ) |
| 13 | 7, 11, 12 | rlimrecl 15655 | . . . . 5 ⊢ (𝜑 → 𝐿 ∈ ℝ) |
| 14 | resubcl 11537 | . . . . 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 11252 | . . 3 ⊢ ((𝜑 ∧ 𝑦 ∈ ℝ+) → ((𝐹‘𝑦) − 𝐿) ∈ ℂ) |
| 17 | rpsqrtcl 15339 | . . . . 5 ⊢ (𝑦 ∈ ℝ+ → (√‘𝑦) ∈ ℝ+) | |
| 18 | 17 | adantl 487 | . . . 4 ⊢ ((𝜑 ∧ 𝑦 ∈ ℝ+) → (√‘𝑦) ∈ ℝ+) |
| 19 | 18 | rpcnd 13078 | . . 3 ⊢ ((𝜑 ∧ 𝑦 ∈ ℝ+) → (√‘𝑦) ∈ ℂ) |
| 20 | 16, 19 | mulcld 11244 | . 2 ⊢ ((𝜑 ∧ 𝑦 ∈ ℝ+) → (((𝐹‘𝑦) − 𝐿) · (√‘𝑦)) ∈ ℂ) |
| 21 | 1red 11224 | . 2 ⊢ (𝜑 → 1 ∈ ℝ) | |
| 22 | 16, 19 | absmuld 15532 | . . . . 5 ⊢ ((𝜑 ∧ 𝑦 ∈ ℝ+) → (abs‘(((𝐹‘𝑦) − 𝐿) · (√‘𝑦))) = ((abs‘((𝐹‘𝑦) − 𝐿)) · (abs‘(√‘𝑦)))) |
| 23 | 18 | rprege0d 13083 | . . . . . . 7 ⊢ ((𝜑 ∧ 𝑦 ∈ ℝ+) → ((√‘𝑦) ∈ ℝ ∧ 0 ≤ (√‘𝑦))) |
| 24 | absid 15371 | . . . . . . 7 ⊢ (((√‘𝑦) ∈ ℝ ∧ 0 ≤ (√‘𝑦)) → (abs‘(√‘𝑦)) = (√‘𝑦)) | |
| 25 | 23, 24 | syl 18 | . . . . . 6 ⊢ ((𝜑 ∧ 𝑦 ∈ ℝ+) → (abs‘(√‘𝑦)) = (√‘𝑦)) |
| 26 | 25 | oveq2d 7435 | . . . . 5 ⊢ ((𝜑 ∧ 𝑦 ∈ ℝ+) → ((abs‘((𝐹‘𝑦) − 𝐿)) · (abs‘(√‘𝑦))) = ((abs‘((𝐹‘𝑦) − 𝐿)) · (√‘𝑦))) |
| 27 | 22, 26 | eqtrd 2800 | . . . 4 ⊢ ((𝜑 ∧ 𝑦 ∈ ℝ+) → (abs‘(((𝐹‘𝑦) − 𝐿) · (√‘𝑦))) = ((abs‘((𝐹‘𝑦) − 𝐿)) · (√‘𝑦))) |
| 28 | 3, 10 | divsqrtsum2 27198 | . . . . 5 ⊢ ((𝜑 ∧ 𝑦 ∈ ℝ+) → (abs‘((𝐹‘𝑦) − 𝐿)) ≤ (1 / (√‘𝑦))) |
| 29 | 16 | abscld 15514 | . . . . . 6 ⊢ ((𝜑 ∧ 𝑦 ∈ ℝ+) → (abs‘((𝐹‘𝑦) − 𝐿)) ∈ ℝ) |
| 30 | 1red 11224 | . . . . . 6 ⊢ ((𝜑 ∧ 𝑦 ∈ ℝ+) → 1 ∈ ℝ) | |
| 31 | 29, 30, 18 | lemuldivd 13125 | . . . . 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 5135 | . . 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 15611 | 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 2146 ⊆ wss 3906 class class class wbr 5111 ↦ cmpt 5194 ⟶wf 6536 ‘cfv 6540 (class class class)co 7419 supcsup 9407 ℝcr 11114 0cc0 11115 1c1 11116 · cmul 11120 +∞cpnf 11255 ℝ*cxr 11257 < clt 11258 ≤ cle 11259 − cmin 11456 / cdiv 11886 2c2 12310 ℝ+crp 13032 ...cfz 13551 ⌊cfl 13841 √csqrt 15308 abscabs 15309 ⇝𝑟 crli 15560 𝑂(1)co1 15561 Σcsu 15761 |
| 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 2148 ax-9 2156 ax-10 2179 ax-11 2195 ax-12 2216 ax-ext 2737 ax-rep 5240 ax-sep 5259 ax-nul 5271 ax-pow 5338 ax-pr 5406 ax-un 7742 ax-inf2 9617 ax-cnex 11171 ax-resscn 11172 ax-1cn 11173 ax-icn 11174 ax-addcl 11175 ax-addrcl 11176 ax-mulcl 11177 ax-mulrcl 11178 ax-mulcom 11179 ax-addass 11180 ax-mulass 11181 ax-distr 11182 ax-i2m1 11183 ax-1ne0 11184 ax-1rid 11185 ax-rnegex 11186 ax-rrecex 11187 ax-cnre 11188 ax-pre-lttri 11189 ax-pre-lttrn 11190 ax-pre-ltadd 11191 ax-pre-mulgt0 11192 ax-pre-sup 11193 ax-addf 11194 |
| 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 2569 df-eu 2599 df-clab 2744 df-cleq 2757 df-clel 2840 df-nfc 2914 df-ne 2961 df-nel 3067 df-ral 3082 df-rex 3092 df-rmo 3371 df-reu 3372 df-rab 3419 df-v 3459 df-sbc 3747 df-csb 3855 df-dif 3909 df-un 3911 df-in 3913 df-ss 3923 df-pss 3926 df-nul 4287 df-if 4490 df-pw 4566 df-sn 4592 df-pr 4594 df-tp 4596 df-op 4598 df-uni 4875 df-int 4915 df-iun 4960 df-iin 4961 df-br 5112 df-opab 5176 df-mpt 5195 df-tr 5221 df-id 5558 df-eprel 5563 df-po 5571 df-so 5572 df-fr 5616 df-se 5617 df-we 5618 df-xp 5669 df-rel 5670 df-cnv 5671 df-co 5672 df-dm 5673 df-rn 5674 df-res 5675 df-ima 5676 df-pred 6306 df-ord 6367 df-on 6368 df-lim 6369 df-suc 6370 df-iota 6496 df-fun 6542 df-fn 6543 df-f 6544 df-f1 6545 df-fo 6546 df-f1o 6547 df-fv 6548 df-isom 6549 df-riota 7376 df-ov 7422 df-oprab 7423 df-mpo 7424 df-of 7684 df-om 7869 df-1st 7992 df-2nd 7993 df-supp 8163 df-frecs 8284 df-wrecs 8315 df-recs 8364 df-rdg 8403 df-1o 8459 df-2o 8460 df-er 8700 df-map 8832 df-pm 8833 df-ixp 8902 df-en 8950 df-dom 8951 df-sdom 8952 df-fin 8953 df-fsupp 9329 df-fi 9378 df-sup 9409 df-inf 9410 df-oi 9479 df-card 9941 df-pnf 11260 df-mnf 11261 df-xr 11262 df-ltxr 11263 df-le 11264 df-sub 11458 df-neg 11459 df-div 11887 df-nn 12249 df-2 12318 df-3 12319 df-4 12320 df-5 12321 df-6 12322 df-7 12323 df-8 12324 df-9 12325 df-n0 12520 df-z 12607 df-dec 12728 df-uz 12879 df-q 12989 df-rp 13033 df-xneg 13153 df-xadd 13154 df-xmul 13155 df-ioo 13392 df-ioc 13393 df-ico 13394 df-icc 13395 df-fz 13552 df-fzo 13700 df-fl 13843 df-mod 13921 df-seq 14056 df-exp 14116 df-fac 14328 df-bc 14357 df-hash 14385 df-shft 15128 df-cj 15174 df-re 15175 df-im 15176 df-sqrt 15310 df-abs 15311 df-limsup 15546 df-clim 15563 df-rlim 15564 df-o1 15565 df-lo1 15566 df-sum 15762 df-ef 16143 df-sin 16145 df-cos 16146 df-pi 16148 df-struct 17229 df-sets 17246 df-slot 17264 df-ndx 17276 df-base 17292 df-ress 17313 df-plusg 17345 df-mulr 17346 df-starv 17347 df-sca 17348 df-vsca 17349 df-ip 17350 df-tset 17351 df-ple 17352 df-ds 17354 df-unif 17355 df-hom 17356 df-cco 17357 df-rest 17497 df-topn 17498 df-0g 17516 df-gsum 17517 df-topgen 17518 df-pt 17519 df-prds 17522 df-xrs 17578 df-qtop 17583 df-imas 17584 df-xps 17586 df-mre 17660 df-mrc 17661 df-acs 17663 df-mgm 18720 df-sgrp 18809 df-mnd 18825 df-submnd 18879 df-mulg 19178 df-cntz 19431 df-cmn 19896 df-psmet 21564 df-xmet 21565 df-met 21566 df-bl 21567 df-mopn 21568 df-fbas 21569 df-fg 21570 df-cnfld 21573 df-top 23101 df-topon 23118 df-topsp 23140 df-bases 23153 df-cld 23226 df-ntr 23227 df-cls 23228 df-nei 23305 df-lp 23343 df-perf 23344 df-cn 23434 df-cnp 23435 df-haus 23522 df-cmp 23594 df-tx 23770 df-hmeo 23963 df-fil 24054 df-fm 24146 df-flim 24147 df-flf 24148 df-xms 24528 df-ms 24529 df-tms 24530 df-cncf 25088 df-limc 26076 df-dv 26077 df-log 26772 df-cxp 26773 |
| This theorem is used by: (None) |
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