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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 2758 | . . . . 5 ⊢ (𝑛 ∈ ℕ ↦ (2 · ((1 / 2)↑𝑛))) = (𝑛 ∈ ℕ ↦ (2 · ((1 / 2)↑𝑛))) | |
2 | eqid 2758 | . . . . 5 ⊢ (𝑛 ∈ ℕ0 ↦ (1 / (!‘𝑛))) = (𝑛 ∈ ℕ0 ↦ (1 / (!‘𝑛))) | |
3 | 1, 2 | ege2le3 15491 | . . . 4 ⊢ (2 ≤ e ∧ e ≤ 3) |
4 | 3 | simpli 487 | . . 3 ⊢ 2 ≤ e |
5 | eirr 15606 | . . . . . 6 ⊢ e ∉ ℚ | |
6 | 5 | neli 3057 | . . . . 5 ⊢ ¬ e ∈ ℚ |
7 | nnq 12402 | . . . . 5 ⊢ (e ∈ ℕ → e ∈ ℚ) | |
8 | 6, 7 | mto 200 | . . . 4 ⊢ ¬ e ∈ ℕ |
9 | 2nn 11747 | . . . . . 6 ⊢ 2 ∈ ℕ | |
10 | eleq1 2839 | . . . . . 6 ⊢ (e = 2 → (e ∈ ℕ ↔ 2 ∈ ℕ)) | |
11 | 9, 10 | mpbiri 261 | . . . . 5 ⊢ (e = 2 → e ∈ ℕ) |
12 | 11 | necon3bi 2977 | . . . 4 ⊢ (¬ e ∈ ℕ → e ≠ 2) |
13 | 8, 12 | ax-mp 5 | . . 3 ⊢ e ≠ 2 |
14 | 2re 11748 | . . . 4 ⊢ 2 ∈ ℝ | |
15 | ere 15490 | . . . 4 ⊢ e ∈ ℝ | |
16 | 14, 15 | ltleni 10796 | . . 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 11753 | . . . . . 6 ⊢ 3 ∈ ℕ | |
20 | eleq1 2839 | . . . . . 6 ⊢ (3 = e → (3 ∈ ℕ ↔ e ∈ ℕ)) | |
21 | 19, 20 | mpbii 236 | . . . . 5 ⊢ (3 = e → e ∈ ℕ) |
22 | 21 | necon3bi 2977 | . . . 4 ⊢ (¬ e ∈ ℕ → 3 ≠ e) |
23 | 8, 22 | ax-mp 5 | . . 3 ⊢ 3 ≠ e |
24 | 3re 11754 | . . . 4 ⊢ 3 ∈ ℝ | |
25 | 15, 24 | ltleni 10796 | . . 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 2951 class class class wbr 5032 ↦ cmpt 5112 ‘cfv 6335 (class class class)co 7150 1c1 10576 · cmul 10580 < clt 10713 ≤ cle 10714 / cdiv 11335 ℕcn 11674 2c2 11729 3c3 11730 ℕ0cn0 11934 ℚcq 12388 ↑cexp 13479 !cfa 13683 eceu 15464 |
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 2729 ax-rep 5156 ax-sep 5169 ax-nul 5176 ax-pow 5234 ax-pr 5298 ax-un 7459 ax-inf2 9137 ax-cnex 10631 ax-resscn 10632 ax-1cn 10633 ax-icn 10634 ax-addcl 10635 ax-addrcl 10636 ax-mulcl 10637 ax-mulrcl 10638 ax-mulcom 10639 ax-addass 10640 ax-mulass 10641 ax-distr 10642 ax-i2m1 10643 ax-1ne0 10644 ax-1rid 10645 ax-rnegex 10646 ax-rrecex 10647 ax-cnre 10648 ax-pre-lttri 10649 ax-pre-lttrn 10650 ax-pre-ltadd 10651 ax-pre-mulgt0 10652 ax-pre-sup 10653 ax-addf 10654 ax-mulf 10655 |
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 2557 df-eu 2588 df-clab 2736 df-cleq 2750 df-clel 2830 df-nfc 2901 df-ne 2952 df-nel 3056 df-ral 3075 df-rex 3076 df-reu 3077 df-rmo 3078 df-rab 3079 df-v 3411 df-sbc 3697 df-csb 3806 df-dif 3861 df-un 3863 df-in 3865 df-ss 3875 df-pss 3877 df-nul 4226 df-if 4421 df-pw 4496 df-sn 4523 df-pr 4525 df-tp 4527 df-op 4529 df-uni 4799 df-int 4839 df-iun 4885 df-br 5033 df-opab 5095 df-mpt 5113 df-tr 5139 df-id 5430 df-eprel 5435 df-po 5443 df-so 5444 df-fr 5483 df-se 5484 df-we 5485 df-xp 5530 df-rel 5531 df-cnv 5532 df-co 5533 df-dm 5534 df-rn 5535 df-res 5536 df-ima 5537 df-pred 6126 df-ord 6172 df-on 6173 df-lim 6174 df-suc 6175 df-iota 6294 df-fun 6337 df-fn 6338 df-f 6339 df-f1 6340 df-fo 6341 df-f1o 6342 df-fv 6343 df-isom 6344 df-riota 7108 df-ov 7153 df-oprab 7154 df-mpo 7155 df-om 7580 df-1st 7693 df-2nd 7694 df-wrecs 7957 df-recs 8018 df-rdg 8056 df-1o 8112 df-er 8299 df-pm 8419 df-en 8528 df-dom 8529 df-sdom 8530 df-fin 8531 df-sup 8939 df-inf 8940 df-oi 9007 df-card 9401 df-pnf 10715 df-mnf 10716 df-xr 10717 df-ltxr 10718 df-le 10719 df-sub 10910 df-neg 10911 df-div 11336 df-nn 11675 df-2 11737 df-3 11738 df-4 11739 df-n0 11935 df-z 12021 df-uz 12283 df-q 12389 df-rp 12431 df-ico 12785 df-fz 12940 df-fzo 13083 df-fl 13211 df-seq 13419 df-exp 13480 df-fac 13684 df-bc 13713 df-hash 13741 df-shft 14474 df-cj 14506 df-re 14507 df-im 14508 df-sqrt 14642 df-abs 14643 df-limsup 14876 df-clim 14893 df-rlim 14894 df-sum 15091 df-ef 15469 df-e 15470 |
This theorem is referenced by: epos 15608 ene1 15611 cxploglim2 25663 harmonicbnd3 25692 bposlem7 25973 bposlem9 25975 chebbnd1lem2 26153 chebbnd1lem3 26154 chebbnd1 26155 dchrvmasumlema 26183 mulog2sumlem2 26218 pntpbnd1a 26268 pntpbnd2 26270 pntlemb 26280 pntlemk 26289 hgt750lem 32150 subfacval3 32667 aks4d1p1p7 39640 etransclem23 43265 |
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