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Mirrors > Home > MPE Home > Th. List > egt2lt3 | Structured version Visualization version GIF version |
Description: Euler's constant e = 2.71828... is bounded by 2 and 3. (Contributed by NM, 28-Nov-2008.) (Revised by Mario Carneiro, 29-Apr-2014.) |
Ref | Expression |
---|---|
egt2lt3 | ⊢ (2 < e ∧ e < 3) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eqid 2798 | . . . . 5 ⊢ (𝑛 ∈ ℕ ↦ (2 · ((1 / 2)↑𝑛))) = (𝑛 ∈ ℕ ↦ (2 · ((1 / 2)↑𝑛))) | |
2 | eqid 2798 | . . . . 5 ⊢ (𝑛 ∈ ℕ0 ↦ (1 / (!‘𝑛))) = (𝑛 ∈ ℕ0 ↦ (1 / (!‘𝑛))) | |
3 | 1, 2 | ege2le3 15435 | . . . 4 ⊢ (2 ≤ e ∧ e ≤ 3) |
4 | 3 | simpli 487 | . . 3 ⊢ 2 ≤ e |
5 | eirr 15550 | . . . . . 6 ⊢ e ∉ ℚ | |
6 | 5 | neli 3093 | . . . . 5 ⊢ ¬ e ∈ ℚ |
7 | nnq 12349 | . . . . 5 ⊢ (e ∈ ℕ → e ∈ ℚ) | |
8 | 6, 7 | mto 200 | . . . 4 ⊢ ¬ e ∈ ℕ |
9 | 2nn 11698 | . . . . . 6 ⊢ 2 ∈ ℕ | |
10 | eleq1 2877 | . . . . . 6 ⊢ (e = 2 → (e ∈ ℕ ↔ 2 ∈ ℕ)) | |
11 | 9, 10 | mpbiri 261 | . . . . 5 ⊢ (e = 2 → e ∈ ℕ) |
12 | 11 | necon3bi 3013 | . . . 4 ⊢ (¬ e ∈ ℕ → e ≠ 2) |
13 | 8, 12 | ax-mp 5 | . . 3 ⊢ e ≠ 2 |
14 | 2re 11699 | . . . 4 ⊢ 2 ∈ ℝ | |
15 | ere 15434 | . . . 4 ⊢ e ∈ ℝ | |
16 | 14, 15 | ltleni 10747 | . . 3 ⊢ (2 < e ↔ (2 ≤ e ∧ e ≠ 2)) |
17 | 4, 13, 16 | mpbir2an 710 | . 2 ⊢ 2 < e |
18 | 3 | simpri 489 | . . 3 ⊢ e ≤ 3 |
19 | 3nn 11704 | . . . . . 6 ⊢ 3 ∈ ℕ | |
20 | eleq1 2877 | . . . . . 6 ⊢ (3 = e → (3 ∈ ℕ ↔ e ∈ ℕ)) | |
21 | 19, 20 | mpbii 236 | . . . . 5 ⊢ (3 = e → e ∈ ℕ) |
22 | 21 | necon3bi 3013 | . . . 4 ⊢ (¬ e ∈ ℕ → 3 ≠ e) |
23 | 8, 22 | ax-mp 5 | . . 3 ⊢ 3 ≠ e |
24 | 3re 11705 | . . . 4 ⊢ 3 ∈ ℝ | |
25 | 15, 24 | ltleni 10747 | . . 3 ⊢ (e < 3 ↔ (e ≤ 3 ∧ 3 ≠ e)) |
26 | 18, 23, 25 | mpbir2an 710 | . 2 ⊢ e < 3 |
27 | 17, 26 | pm3.2i 474 | 1 ⊢ (2 < e ∧ e < 3) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 ∧ wa 399 = wceq 1538 ∈ wcel 2111 ≠ wne 2987 class class class wbr 5030 ↦ cmpt 5110 ‘cfv 6324 (class class class)co 7135 1c1 10527 · cmul 10531 < clt 10664 ≤ cle 10665 / cdiv 11286 ℕcn 11625 2c2 11680 3c3 11681 ℕ0cn0 11885 ℚcq 12336 ↑cexp 13425 !cfa 13629 eceu 15408 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2113 ax-9 2121 ax-10 2142 ax-11 2158 ax-12 2175 ax-ext 2770 ax-rep 5154 ax-sep 5167 ax-nul 5174 ax-pow 5231 ax-pr 5295 ax-un 7441 ax-inf2 9088 ax-cnex 10582 ax-resscn 10583 ax-1cn 10584 ax-icn 10585 ax-addcl 10586 ax-addrcl 10587 ax-mulcl 10588 ax-mulrcl 10589 ax-mulcom 10590 ax-addass 10591 ax-mulass 10592 ax-distr 10593 ax-i2m1 10594 ax-1ne0 10595 ax-1rid 10596 ax-rnegex 10597 ax-rrecex 10598 ax-cnre 10599 ax-pre-lttri 10600 ax-pre-lttrn 10601 ax-pre-ltadd 10602 ax-pre-mulgt0 10603 ax-pre-sup 10604 ax-addf 10605 ax-mulf 10606 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 845 df-3or 1085 df-3an 1086 df-tru 1541 df-fal 1551 df-ex 1782 df-nf 1786 df-sb 2070 df-mo 2598 df-eu 2629 df-clab 2777 df-cleq 2791 df-clel 2870 df-nfc 2938 df-ne 2988 df-nel 3092 df-ral 3111 df-rex 3112 df-reu 3113 df-rmo 3114 df-rab 3115 df-v 3443 df-sbc 3721 df-csb 3829 df-dif 3884 df-un 3886 df-in 3888 df-ss 3898 df-pss 3900 df-nul 4244 df-if 4426 df-pw 4499 df-sn 4526 df-pr 4528 df-tp 4530 df-op 4532 df-uni 4801 df-int 4839 df-iun 4883 df-br 5031 df-opab 5093 df-mpt 5111 df-tr 5137 df-id 5425 df-eprel 5430 df-po 5438 df-so 5439 df-fr 5478 df-se 5479 df-we 5480 df-xp 5525 df-rel 5526 df-cnv 5527 df-co 5528 df-dm 5529 df-rn 5530 df-res 5531 df-ima 5532 df-pred 6116 df-ord 6162 df-on 6163 df-lim 6164 df-suc 6165 df-iota 6283 df-fun 6326 df-fn 6327 df-f 6328 df-f1 6329 df-fo 6330 df-f1o 6331 df-fv 6332 df-isom 6333 df-riota 7093 df-ov 7138 df-oprab 7139 df-mpo 7140 df-om 7561 df-1st 7671 df-2nd 7672 df-wrecs 7930 df-recs 7991 df-rdg 8029 df-1o 8085 df-oadd 8089 df-er 8272 df-pm 8392 df-en 8493 df-dom 8494 df-sdom 8495 df-fin 8496 df-sup 8890 df-inf 8891 df-oi 8958 df-card 9352 df-pnf 10666 df-mnf 10667 df-xr 10668 df-ltxr 10669 df-le 10670 df-sub 10861 df-neg 10862 df-div 11287 df-nn 11626 df-2 11688 df-3 11689 df-4 11690 df-n0 11886 df-z 11970 df-uz 12232 df-q 12337 df-rp 12378 df-ico 12732 df-fz 12886 df-fzo 13029 df-fl 13157 df-seq 13365 df-exp 13426 df-fac 13630 df-bc 13659 df-hash 13687 df-shft 14418 df-cj 14450 df-re 14451 df-im 14452 df-sqrt 14586 df-abs 14587 df-limsup 14820 df-clim 14837 df-rlim 14838 df-sum 15035 df-ef 15413 df-e 15414 |
This theorem is referenced by: epos 15552 ene1 15555 cxploglim2 25564 harmonicbnd3 25593 bposlem7 25874 bposlem9 25876 chebbnd1lem2 26054 chebbnd1lem3 26055 chebbnd1 26056 dchrvmasumlema 26084 mulog2sumlem2 26119 pntpbnd1a 26169 pntpbnd2 26171 pntlemb 26181 pntlemk 26190 hgt750lem 32032 subfacval3 32549 etransclem23 42899 |
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