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Mirrors > Home > MPE Home > Th. List > effsumlt | Structured version Visualization version GIF version |
Description: The partial sums of the series expansion of the exponential function at a positive real number are bounded by the value of the function. (Contributed by Paul Chapman, 21-Aug-2007.) (Revised by Mario Carneiro, 29-Apr-2014.) |
Ref | Expression |
---|---|
effsumlt.1 | ⊢ 𝐹 = (𝑛 ∈ ℕ0 ↦ ((𝐴↑𝑛) / (!‘𝑛))) |
effsumlt.2 | ⊢ (𝜑 → 𝐴 ∈ ℝ+) |
effsumlt.3 | ⊢ (𝜑 → 𝑁 ∈ ℕ0) |
Ref | Expression |
---|---|
effsumlt | ⊢ (𝜑 → (seq0( + , 𝐹)‘𝑁) < (exp‘𝐴)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nn0uz 12917 | . . . . 5 ⊢ ℕ0 = (ℤ≥‘0) | |
2 | 0zd 12622 | . . . . 5 ⊢ (𝜑 → 0 ∈ ℤ) | |
3 | effsumlt.1 | . . . . . . . 8 ⊢ 𝐹 = (𝑛 ∈ ℕ0 ↦ ((𝐴↑𝑛) / (!‘𝑛))) | |
4 | 3 | eftval 16108 | . . . . . . 7 ⊢ (𝑘 ∈ ℕ0 → (𝐹‘𝑘) = ((𝐴↑𝑘) / (!‘𝑘))) |
5 | 4 | adantl 481 | . . . . . 6 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ0) → (𝐹‘𝑘) = ((𝐴↑𝑘) / (!‘𝑘))) |
6 | effsumlt.2 | . . . . . . . 8 ⊢ (𝜑 → 𝐴 ∈ ℝ+) | |
7 | 6 | rpred 13074 | . . . . . . 7 ⊢ (𝜑 → 𝐴 ∈ ℝ) |
8 | reeftcl 16106 | . . . . . . 7 ⊢ ((𝐴 ∈ ℝ ∧ 𝑘 ∈ ℕ0) → ((𝐴↑𝑘) / (!‘𝑘)) ∈ ℝ) | |
9 | 7, 8 | sylan 580 | . . . . . 6 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ0) → ((𝐴↑𝑘) / (!‘𝑘)) ∈ ℝ) |
10 | 5, 9 | eqeltrd 2838 | . . . . 5 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ0) → (𝐹‘𝑘) ∈ ℝ) |
11 | 1, 2, 10 | serfre 14068 | . . . 4 ⊢ (𝜑 → seq0( + , 𝐹):ℕ0⟶ℝ) |
12 | effsumlt.3 | . . . 4 ⊢ (𝜑 → 𝑁 ∈ ℕ0) | |
13 | 11, 12 | ffvelcdmd 7104 | . . 3 ⊢ (𝜑 → (seq0( + , 𝐹)‘𝑁) ∈ ℝ) |
14 | eqid 2734 | . . . 4 ⊢ (ℤ≥‘(𝑁 + 1)) = (ℤ≥‘(𝑁 + 1)) | |
15 | peano2nn0 12563 | . . . . 5 ⊢ (𝑁 ∈ ℕ0 → (𝑁 + 1) ∈ ℕ0) | |
16 | 12, 15 | syl 17 | . . . 4 ⊢ (𝜑 → (𝑁 + 1) ∈ ℕ0) |
17 | eqidd 2735 | . . . 4 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ0) → (𝐹‘𝑘) = (𝐹‘𝑘)) | |
18 | nn0z 12635 | . . . . . . 7 ⊢ (𝑘 ∈ ℕ0 → 𝑘 ∈ ℤ) | |
19 | rpexpcl 14117 | . . . . . . 7 ⊢ ((𝐴 ∈ ℝ+ ∧ 𝑘 ∈ ℤ) → (𝐴↑𝑘) ∈ ℝ+) | |
20 | 6, 18, 19 | syl2an 596 | . . . . . 6 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ0) → (𝐴↑𝑘) ∈ ℝ+) |
21 | faccl 14318 | . . . . . . . 8 ⊢ (𝑘 ∈ ℕ0 → (!‘𝑘) ∈ ℕ) | |
22 | 21 | adantl 481 | . . . . . . 7 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ0) → (!‘𝑘) ∈ ℕ) |
23 | 22 | nnrpd 13072 | . . . . . 6 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ0) → (!‘𝑘) ∈ ℝ+) |
24 | 20, 23 | rpdivcld 13091 | . . . . 5 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ0) → ((𝐴↑𝑘) / (!‘𝑘)) ∈ ℝ+) |
25 | 5, 24 | eqeltrd 2838 | . . . 4 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ0) → (𝐹‘𝑘) ∈ ℝ+) |
26 | 7 | recnd 11286 | . . . . 5 ⊢ (𝜑 → 𝐴 ∈ ℂ) |
27 | 3 | efcllem 16109 | . . . . 5 ⊢ (𝐴 ∈ ℂ → seq0( + , 𝐹) ∈ dom ⇝ ) |
28 | 26, 27 | syl 17 | . . . 4 ⊢ (𝜑 → seq0( + , 𝐹) ∈ dom ⇝ ) |
29 | 1, 14, 16, 17, 25, 28 | isumrpcl 15875 | . . 3 ⊢ (𝜑 → Σ𝑘 ∈ (ℤ≥‘(𝑁 + 1))(𝐹‘𝑘) ∈ ℝ+) |
30 | 13, 29 | ltaddrpd 13107 | . 2 ⊢ (𝜑 → (seq0( + , 𝐹)‘𝑁) < ((seq0( + , 𝐹)‘𝑁) + Σ𝑘 ∈ (ℤ≥‘(𝑁 + 1))(𝐹‘𝑘))) |
31 | 3 | efval2 16116 | . . . 4 ⊢ (𝐴 ∈ ℂ → (exp‘𝐴) = Σ𝑘 ∈ ℕ0 (𝐹‘𝑘)) |
32 | 26, 31 | syl 17 | . . 3 ⊢ (𝜑 → (exp‘𝐴) = Σ𝑘 ∈ ℕ0 (𝐹‘𝑘)) |
33 | 10 | recnd 11286 | . . . 4 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ0) → (𝐹‘𝑘) ∈ ℂ) |
34 | 1, 14, 16, 17, 33, 28 | isumsplit 15872 | . . 3 ⊢ (𝜑 → Σ𝑘 ∈ ℕ0 (𝐹‘𝑘) = (Σ𝑘 ∈ (0...((𝑁 + 1) − 1))(𝐹‘𝑘) + Σ𝑘 ∈ (ℤ≥‘(𝑁 + 1))(𝐹‘𝑘))) |
35 | 12 | nn0cnd 12586 | . . . . . . . 8 ⊢ (𝜑 → 𝑁 ∈ ℂ) |
36 | ax-1cn 11210 | . . . . . . . 8 ⊢ 1 ∈ ℂ | |
37 | pncan 11511 | . . . . . . . 8 ⊢ ((𝑁 ∈ ℂ ∧ 1 ∈ ℂ) → ((𝑁 + 1) − 1) = 𝑁) | |
38 | 35, 36, 37 | sylancl 586 | . . . . . . 7 ⊢ (𝜑 → ((𝑁 + 1) − 1) = 𝑁) |
39 | 38 | oveq2d 7446 | . . . . . 6 ⊢ (𝜑 → (0...((𝑁 + 1) − 1)) = (0...𝑁)) |
40 | 39 | sumeq1d 15732 | . . . . 5 ⊢ (𝜑 → Σ𝑘 ∈ (0...((𝑁 + 1) − 1))(𝐹‘𝑘) = Σ𝑘 ∈ (0...𝑁)(𝐹‘𝑘)) |
41 | eqidd 2735 | . . . . . 6 ⊢ ((𝜑 ∧ 𝑘 ∈ (0...𝑁)) → (𝐹‘𝑘) = (𝐹‘𝑘)) | |
42 | 12, 1 | eleqtrdi 2848 | . . . . . 6 ⊢ (𝜑 → 𝑁 ∈ (ℤ≥‘0)) |
43 | elfznn0 13656 | . . . . . . 7 ⊢ (𝑘 ∈ (0...𝑁) → 𝑘 ∈ ℕ0) | |
44 | 43, 33 | sylan2 593 | . . . . . 6 ⊢ ((𝜑 ∧ 𝑘 ∈ (0...𝑁)) → (𝐹‘𝑘) ∈ ℂ) |
45 | 41, 42, 44 | fsumser 15762 | . . . . 5 ⊢ (𝜑 → Σ𝑘 ∈ (0...𝑁)(𝐹‘𝑘) = (seq0( + , 𝐹)‘𝑁)) |
46 | 40, 45 | eqtrd 2774 | . . . 4 ⊢ (𝜑 → Σ𝑘 ∈ (0...((𝑁 + 1) − 1))(𝐹‘𝑘) = (seq0( + , 𝐹)‘𝑁)) |
47 | 46 | oveq1d 7445 | . . 3 ⊢ (𝜑 → (Σ𝑘 ∈ (0...((𝑁 + 1) − 1))(𝐹‘𝑘) + Σ𝑘 ∈ (ℤ≥‘(𝑁 + 1))(𝐹‘𝑘)) = ((seq0( + , 𝐹)‘𝑁) + Σ𝑘 ∈ (ℤ≥‘(𝑁 + 1))(𝐹‘𝑘))) |
48 | 32, 34, 47 | 3eqtrd 2778 | . 2 ⊢ (𝜑 → (exp‘𝐴) = ((seq0( + , 𝐹)‘𝑁) + Σ𝑘 ∈ (ℤ≥‘(𝑁 + 1))(𝐹‘𝑘))) |
49 | 30, 48 | breqtrrd 5175 | 1 ⊢ (𝜑 → (seq0( + , 𝐹)‘𝑁) < (exp‘𝐴)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 395 = wceq 1536 ∈ wcel 2105 class class class wbr 5147 ↦ cmpt 5230 dom cdm 5688 ‘cfv 6562 (class class class)co 7430 ℂcc 11150 ℝcr 11151 0cc0 11152 1c1 11153 + caddc 11155 < clt 11292 − cmin 11489 / cdiv 11917 ℕcn 12263 ℕ0cn0 12523 ℤcz 12610 ℤ≥cuz 12875 ℝ+crp 13031 ...cfz 13543 seqcseq 14038 ↑cexp 14098 !cfa 14308 ⇝ cli 15516 Σcsu 15718 expce 16093 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1791 ax-4 1805 ax-5 1907 ax-6 1964 ax-7 2004 ax-8 2107 ax-9 2115 ax-10 2138 ax-11 2154 ax-12 2174 ax-ext 2705 ax-rep 5284 ax-sep 5301 ax-nul 5311 ax-pow 5370 ax-pr 5437 ax-un 7753 ax-inf2 9678 ax-cnex 11208 ax-resscn 11209 ax-1cn 11210 ax-icn 11211 ax-addcl 11212 ax-addrcl 11213 ax-mulcl 11214 ax-mulrcl 11215 ax-mulcom 11216 ax-addass 11217 ax-mulass 11218 ax-distr 11219 ax-i2m1 11220 ax-1ne0 11221 ax-1rid 11222 ax-rnegex 11223 ax-rrecex 11224 ax-cnre 11225 ax-pre-lttri 11226 ax-pre-lttrn 11227 ax-pre-ltadd 11228 ax-pre-mulgt0 11229 ax-pre-sup 11230 |
This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1539 df-fal 1549 df-ex 1776 df-nf 1780 df-sb 2062 df-mo 2537 df-eu 2566 df-clab 2712 df-cleq 2726 df-clel 2813 df-nfc 2889 df-ne 2938 df-nel 3044 df-ral 3059 df-rex 3068 df-rmo 3377 df-reu 3378 df-rab 3433 df-v 3479 df-sbc 3791 df-csb 3908 df-dif 3965 df-un 3967 df-in 3969 df-ss 3979 df-pss 3982 df-nul 4339 df-if 4531 df-pw 4606 df-sn 4631 df-pr 4633 df-op 4637 df-uni 4912 df-int 4951 df-iun 4997 df-br 5148 df-opab 5210 df-mpt 5231 df-tr 5265 df-id 5582 df-eprel 5588 df-po 5596 df-so 5597 df-fr 5640 df-se 5641 df-we 5642 df-xp 5694 df-rel 5695 df-cnv 5696 df-co 5697 df-dm 5698 df-rn 5699 df-res 5700 df-ima 5701 df-pred 6322 df-ord 6388 df-on 6389 df-lim 6390 df-suc 6391 df-iota 6515 df-fun 6564 df-fn 6565 df-f 6566 df-f1 6567 df-fo 6568 df-f1o 6569 df-fv 6570 df-isom 6571 df-riota 7387 df-ov 7433 df-oprab 7434 df-mpo 7435 df-om 7887 df-1st 8012 df-2nd 8013 df-frecs 8304 df-wrecs 8335 df-recs 8409 df-rdg 8448 df-1o 8504 df-er 8743 df-pm 8867 df-en 8984 df-dom 8985 df-sdom 8986 df-fin 8987 df-sup 9479 df-inf 9480 df-oi 9547 df-card 9976 df-pnf 11294 df-mnf 11295 df-xr 11296 df-ltxr 11297 df-le 11298 df-sub 11491 df-neg 11492 df-div 11918 df-nn 12264 df-2 12326 df-3 12327 df-n0 12524 df-z 12611 df-uz 12876 df-rp 13032 df-ico 13389 df-fz 13544 df-fzo 13691 df-fl 13828 df-seq 14039 df-exp 14099 df-fac 14309 df-hash 14366 df-shft 15102 df-cj 15134 df-re 15135 df-im 15136 df-sqrt 15270 df-abs 15271 df-limsup 15503 df-clim 15520 df-rlim 15521 df-sum 15719 df-ef 16099 |
This theorem is referenced by: efgt1p2 16146 efgt1p 16147 |
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