Mathbox for Glauco Siliprandi |
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Mirrors > Home > MPE Home > Th. List > Mathboxes > wallispilem2 | Structured version Visualization version GIF version |
Description: A first set of properties for the sequence 𝐼 that will be used in the proof of the Wallis product formula. (Contributed by Glauco Siliprandi, 29-Jun-2017.) |
Ref | Expression |
---|---|
wallispilem2.1 | ⊢ 𝐼 = (𝑛 ∈ ℕ0 ↦ ∫(0(,)π)((sin‘𝑥)↑𝑛) d𝑥) |
Ref | Expression |
---|---|
wallispilem2 | ⊢ ((𝐼‘0) = π ∧ (𝐼‘1) = 2 ∧ (𝑁 ∈ (ℤ≥‘2) → (𝐼‘𝑁) = (((𝑁 − 1) / 𝑁) · (𝐼‘(𝑁 − 2))))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 0nn0 11900 | . . 3 ⊢ 0 ∈ ℕ0 | |
2 | oveq2 7153 | . . . . . . . 8 ⊢ (𝑛 = 0 → ((sin‘𝑥)↑𝑛) = ((sin‘𝑥)↑0)) | |
3 | 2 | adantr 481 | . . . . . . 7 ⊢ ((𝑛 = 0 ∧ 𝑥 ∈ (0(,)π)) → ((sin‘𝑥)↑𝑛) = ((sin‘𝑥)↑0)) |
4 | ioosscn 41645 | . . . . . . . . . . 11 ⊢ (0(,)π) ⊆ ℂ | |
5 | 4 | sseli 3960 | . . . . . . . . . 10 ⊢ (𝑥 ∈ (0(,)π) → 𝑥 ∈ ℂ) |
6 | 5 | sincld 15471 | . . . . . . . . 9 ⊢ (𝑥 ∈ (0(,)π) → (sin‘𝑥) ∈ ℂ) |
7 | 6 | adantl 482 | . . . . . . . 8 ⊢ ((𝑛 = 0 ∧ 𝑥 ∈ (0(,)π)) → (sin‘𝑥) ∈ ℂ) |
8 | 7 | exp0d 13492 | . . . . . . 7 ⊢ ((𝑛 = 0 ∧ 𝑥 ∈ (0(,)π)) → ((sin‘𝑥)↑0) = 1) |
9 | 3, 8 | eqtrd 2853 | . . . . . 6 ⊢ ((𝑛 = 0 ∧ 𝑥 ∈ (0(,)π)) → ((sin‘𝑥)↑𝑛) = 1) |
10 | 9 | itgeq2dv 24309 | . . . . 5 ⊢ (𝑛 = 0 → ∫(0(,)π)((sin‘𝑥)↑𝑛) d𝑥 = ∫(0(,)π)1 d𝑥) |
11 | ioombl 24093 | . . . . . . 7 ⊢ (0(,)π) ∈ dom vol | |
12 | 0re 10631 | . . . . . . . 8 ⊢ 0 ∈ ℝ | |
13 | pire 24971 | . . . . . . . 8 ⊢ π ∈ ℝ | |
14 | ioovolcl 24098 | . . . . . . . 8 ⊢ ((0 ∈ ℝ ∧ π ∈ ℝ) → (vol‘(0(,)π)) ∈ ℝ) | |
15 | 12, 13, 14 | mp2an 688 | . . . . . . 7 ⊢ (vol‘(0(,)π)) ∈ ℝ |
16 | ax-1cn 10583 | . . . . . . 7 ⊢ 1 ∈ ℂ | |
17 | itgconst 24346 | . . . . . . 7 ⊢ (((0(,)π) ∈ dom vol ∧ (vol‘(0(,)π)) ∈ ℝ ∧ 1 ∈ ℂ) → ∫(0(,)π)1 d𝑥 = (1 · (vol‘(0(,)π)))) | |
18 | 11, 15, 16, 17 | mp3an 1452 | . . . . . 6 ⊢ ∫(0(,)π)1 d𝑥 = (1 · (vol‘(0(,)π))) |
19 | 15 | recni 10643 | . . . . . . . 8 ⊢ (vol‘(0(,)π)) ∈ ℂ |
20 | 19 | mulid2i 10634 | . . . . . . 7 ⊢ (1 · (vol‘(0(,)π))) = (vol‘(0(,)π)) |
21 | pipos 24973 | . . . . . . . . . 10 ⊢ 0 < π | |
22 | 12, 13, 21 | ltleii 10751 | . . . . . . . . 9 ⊢ 0 ≤ π |
23 | volioo 24097 | . . . . . . . . 9 ⊢ ((0 ∈ ℝ ∧ π ∈ ℝ ∧ 0 ≤ π) → (vol‘(0(,)π)) = (π − 0)) | |
24 | 12, 13, 22, 23 | mp3an 1452 | . . . . . . . 8 ⊢ (vol‘(0(,)π)) = (π − 0) |
25 | 13 | recni 10643 | . . . . . . . . 9 ⊢ π ∈ ℂ |
26 | 25 | subid1i 10946 | . . . . . . . 8 ⊢ (π − 0) = π |
27 | 24, 26 | eqtri 2841 | . . . . . . 7 ⊢ (vol‘(0(,)π)) = π |
28 | 20, 27 | eqtri 2841 | . . . . . 6 ⊢ (1 · (vol‘(0(,)π))) = π |
29 | 18, 28 | eqtri 2841 | . . . . 5 ⊢ ∫(0(,)π)1 d𝑥 = π |
30 | 10, 29 | syl6eq 2869 | . . . 4 ⊢ (𝑛 = 0 → ∫(0(,)π)((sin‘𝑥)↑𝑛) d𝑥 = π) |
31 | wallispilem2.1 | . . . 4 ⊢ 𝐼 = (𝑛 ∈ ℕ0 ↦ ∫(0(,)π)((sin‘𝑥)↑𝑛) d𝑥) | |
32 | 13 | elexi 3511 | . . . 4 ⊢ π ∈ V |
33 | 30, 31, 32 | fvmpt 6761 | . . 3 ⊢ (0 ∈ ℕ0 → (𝐼‘0) = π) |
34 | 1, 33 | ax-mp 5 | . 2 ⊢ (𝐼‘0) = π |
35 | 1nn0 11901 | . . . 4 ⊢ 1 ∈ ℕ0 | |
36 | simpl 483 | . . . . . . . 8 ⊢ ((𝑛 = 1 ∧ 𝑥 ∈ (0(,)π)) → 𝑛 = 1) | |
37 | 36 | oveq2d 7161 | . . . . . . 7 ⊢ ((𝑛 = 1 ∧ 𝑥 ∈ (0(,)π)) → ((sin‘𝑥)↑𝑛) = ((sin‘𝑥)↑1)) |
38 | 6 | adantl 482 | . . . . . . . 8 ⊢ ((𝑛 = 1 ∧ 𝑥 ∈ (0(,)π)) → (sin‘𝑥) ∈ ℂ) |
39 | 38 | exp1d 13493 | . . . . . . 7 ⊢ ((𝑛 = 1 ∧ 𝑥 ∈ (0(,)π)) → ((sin‘𝑥)↑1) = (sin‘𝑥)) |
40 | 37, 39 | eqtrd 2853 | . . . . . 6 ⊢ ((𝑛 = 1 ∧ 𝑥 ∈ (0(,)π)) → ((sin‘𝑥)↑𝑛) = (sin‘𝑥)) |
41 | 40 | itgeq2dv 24309 | . . . . 5 ⊢ (𝑛 = 1 → ∫(0(,)π)((sin‘𝑥)↑𝑛) d𝑥 = ∫(0(,)π)(sin‘𝑥) d𝑥) |
42 | itgex 24298 | . . . . 5 ⊢ ∫(0(,)π)(sin‘𝑥) d𝑥 ∈ V | |
43 | 41, 31, 42 | fvmpt 6761 | . . . 4 ⊢ (1 ∈ ℕ0 → (𝐼‘1) = ∫(0(,)π)(sin‘𝑥) d𝑥) |
44 | 35, 43 | ax-mp 5 | . . 3 ⊢ (𝐼‘1) = ∫(0(,)π)(sin‘𝑥) d𝑥 |
45 | itgsin0pi 42113 | . . 3 ⊢ ∫(0(,)π)(sin‘𝑥) d𝑥 = 2 | |
46 | 44, 45 | eqtri 2841 | . 2 ⊢ (𝐼‘1) = 2 |
47 | id 22 | . . 3 ⊢ (𝑁 ∈ (ℤ≥‘2) → 𝑁 ∈ (ℤ≥‘2)) | |
48 | 31, 47 | itgsinexp 42116 | . 2 ⊢ (𝑁 ∈ (ℤ≥‘2) → (𝐼‘𝑁) = (((𝑁 − 1) / 𝑁) · (𝐼‘(𝑁 − 2)))) |
49 | 34, 46, 48 | 3pm3.2i 1331 | 1 ⊢ ((𝐼‘0) = π ∧ (𝐼‘1) = 2 ∧ (𝑁 ∈ (ℤ≥‘2) → (𝐼‘𝑁) = (((𝑁 − 1) / 𝑁) · (𝐼‘(𝑁 − 2))))) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 396 ∧ w3a 1079 = wceq 1528 ∈ wcel 2105 class class class wbr 5057 ↦ cmpt 5137 dom cdm 5548 ‘cfv 6348 (class class class)co 7145 ℂcc 10523 ℝcr 10524 0cc0 10525 1c1 10526 · cmul 10530 ≤ cle 10664 − cmin 10858 / cdiv 11285 2c2 11680 ℕ0cn0 11885 ℤ≥cuz 12231 (,)cioo 12726 ↑cexp 13417 sincsin 15405 πcpi 15408 volcvol 23991 ∫citg 24146 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1787 ax-4 1801 ax-5 1902 ax-6 1961 ax-7 2006 ax-8 2107 ax-9 2115 ax-10 2136 ax-11 2151 ax-12 2167 ax-ext 2790 ax-rep 5181 ax-sep 5194 ax-nul 5201 ax-pow 5257 ax-pr 5320 ax-un 7450 ax-inf2 9092 ax-cc 9845 ax-cnex 10581 ax-resscn 10582 ax-1cn 10583 ax-icn 10584 ax-addcl 10585 ax-addrcl 10586 ax-mulcl 10587 ax-mulrcl 10588 ax-mulcom 10589 ax-addass 10590 ax-mulass 10591 ax-distr 10592 ax-i2m1 10593 ax-1ne0 10594 ax-1rid 10595 ax-rnegex 10596 ax-rrecex 10597 ax-cnre 10598 ax-pre-lttri 10599 ax-pre-lttrn 10600 ax-pre-ltadd 10601 ax-pre-mulgt0 10602 ax-pre-sup 10603 ax-addf 10604 ax-mulf 10605 |
This theorem depends on definitions: df-bi 208 df-an 397 df-or 842 df-3or 1080 df-3an 1081 df-tru 1531 df-fal 1541 df-ex 1772 df-nf 1776 df-sb 2061 df-mo 2615 df-eu 2647 df-clab 2797 df-cleq 2811 df-clel 2890 df-nfc 2960 df-ne 3014 df-nel 3121 df-ral 3140 df-rex 3141 df-reu 3142 df-rmo 3143 df-rab 3144 df-v 3494 df-sbc 3770 df-csb 3881 df-dif 3936 df-un 3938 df-in 3940 df-ss 3949 df-pss 3951 df-symdif 4216 df-nul 4289 df-if 4464 df-pw 4537 df-sn 4558 df-pr 4560 df-tp 4562 df-op 4564 df-uni 4831 df-int 4868 df-iun 4912 df-iin 4913 df-disj 5023 df-br 5058 df-opab 5120 df-mpt 5138 df-tr 5164 df-id 5453 df-eprel 5458 df-po 5467 df-so 5468 df-fr 5507 df-se 5508 df-we 5509 df-xp 5554 df-rel 5555 df-cnv 5556 df-co 5557 df-dm 5558 df-rn 5559 df-res 5560 df-ima 5561 df-pred 6141 df-ord 6187 df-on 6188 df-lim 6189 df-suc 6190 df-iota 6307 df-fun 6350 df-fn 6351 df-f 6352 df-f1 6353 df-fo 6354 df-f1o 6355 df-fv 6356 df-isom 6357 df-riota 7103 df-ov 7148 df-oprab 7149 df-mpo 7150 df-of 7398 df-ofr 7399 df-om 7570 df-1st 7678 df-2nd 7679 df-supp 7820 df-wrecs 7936 df-recs 7997 df-rdg 8035 df-1o 8091 df-2o 8092 df-oadd 8095 df-omul 8096 df-er 8278 df-map 8397 df-pm 8398 df-ixp 8450 df-en 8498 df-dom 8499 df-sdom 8500 df-fin 8501 df-fsupp 8822 df-fi 8863 df-sup 8894 df-inf 8895 df-oi 8962 df-dju 9318 df-card 9356 df-acn 9359 df-pnf 10665 df-mnf 10666 df-xr 10667 df-ltxr 10668 df-le 10669 df-sub 10860 df-neg 10861 df-div 11286 df-nn 11627 df-2 11688 df-3 11689 df-4 11690 df-5 11691 df-6 11692 df-7 11693 df-8 11694 df-9 11695 df-n0 11886 df-z 11970 df-dec 12087 df-uz 12232 df-q 12337 df-rp 12378 df-xneg 12495 df-xadd 12496 df-xmul 12497 df-ioo 12730 df-ioc 12731 df-ico 12732 df-icc 12733 df-fz 12881 df-fzo 13022 df-fl 13150 df-mod 13226 df-seq 13358 df-exp 13418 df-fac 13622 df-bc 13651 df-hash 13679 df-shft 14414 df-cj 14446 df-re 14447 df-im 14448 df-sqrt 14582 df-abs 14583 df-limsup 14816 df-clim 14833 df-rlim 14834 df-sum 15031 df-ef 15409 df-sin 15411 df-cos 15412 df-pi 15414 df-struct 16473 df-ndx 16474 df-slot 16475 df-base 16477 df-sets 16478 df-ress 16479 df-plusg 16566 df-mulr 16567 df-starv 16568 df-sca 16569 df-vsca 16570 df-ip 16571 df-tset 16572 df-ple 16573 df-ds 16575 df-unif 16576 df-hom 16577 df-cco 16578 df-rest 16684 df-topn 16685 df-0g 16703 df-gsum 16704 df-topgen 16705 df-pt 16706 df-prds 16709 df-xrs 16763 df-qtop 16768 df-imas 16769 df-xps 16771 df-mre 16845 df-mrc 16846 df-acs 16848 df-mgm 17840 df-sgrp 17889 df-mnd 17900 df-submnd 17945 df-mulg 18163 df-cntz 18385 df-cmn 18837 df-psmet 20465 df-xmet 20466 df-met 20467 df-bl 20468 df-mopn 20469 df-fbas 20470 df-fg 20471 df-cnfld 20474 df-top 21430 df-topon 21447 df-topsp 21469 df-bases 21482 df-cld 21555 df-ntr 21556 df-cls 21557 df-nei 21634 df-lp 21672 df-perf 21673 df-cn 21763 df-cnp 21764 df-haus 21851 df-cmp 21923 df-tx 22098 df-hmeo 22291 df-fil 22382 df-fm 22474 df-flim 22475 df-flf 22476 df-xms 22857 df-ms 22858 df-tms 22859 df-cncf 23413 df-ovol 23992 df-vol 23993 df-mbf 24147 df-itg1 24148 df-itg2 24149 df-ibl 24150 df-itg 24151 df-0p 24198 df-limc 24391 df-dv 24392 |
This theorem is referenced by: wallispilem3 42229 wallispilem4 42230 |
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