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| Mirrors > Home > ILE Home > Th. List > egt2lt3 | GIF version | ||
| Description: Euler's constant e = 2.71828... is bounded by 2 and 3. (Contributed by NM, 28-Nov-2008.) (Revised by Jim Kingdon, 7-Jan-2023.) |
| Ref | Expression |
|---|---|
| egt2lt3 | ⊢ (2 < e ∧ e < 3) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eqid 2238 | . . . . 5 ⊢ (𝑛 ∈ ℕ ↦ (2 · ((1 / 2)↑𝑛))) = (𝑛 ∈ ℕ ↦ (2 · ((1 / 2)↑𝑛))) | |
| 2 | eqid 2238 | . . . . 5 ⊢ (𝑛 ∈ ℕ0 ↦ (1 / (!‘𝑛))) = (𝑛 ∈ ℕ0 ↦ (1 / (!‘𝑛))) | |
| 3 | 1, 2 | ege2le3 12416 | . . . 4 ⊢ (2 ≤ e ∧ e ≤ 3) |
| 4 | 3 | simpli 111 | . . 3 ⊢ 2 ≤ e |
| 5 | 2z 9651 | . . . . 5 ⊢ 2 ∈ ℤ | |
| 6 | zq 10005 | . . . . 5 ⊢ (2 ∈ ℤ → 2 ∈ ℚ) | |
| 7 | eirrap 12523 | . . . . 5 ⊢ (2 ∈ ℚ → e # 2) | |
| 8 | 5, 6, 7 | mp2b 8 | . . . 4 ⊢ e # 2 |
| 9 | ere 12415 | . . . . . 6 ⊢ e ∈ ℝ | |
| 10 | 9 | recni 8328 | . . . . 5 ⊢ e ∈ ℂ |
| 11 | 2cn 9354 | . . . . 5 ⊢ 2 ∈ ℂ | |
| 12 | apsym 8924 | . . . . 5 ⊢ ((e ∈ ℂ ∧ 2 ∈ ℂ) → (e # 2 ↔ 2 # e)) | |
| 13 | 10, 11, 12 | mp2an 430 | . . . 4 ⊢ (e # 2 ↔ 2 # e) |
| 14 | 8, 13 | mpbi 145 | . . 3 ⊢ 2 # e |
| 15 | 2re 9353 | . . . 4 ⊢ 2 ∈ ℝ | |
| 16 | ltleap 8950 | . . . 4 ⊢ ((2 ∈ ℝ ∧ e ∈ ℝ) → (2 < e ↔ (2 ≤ e ∧ 2 # e))) | |
| 17 | 15, 9, 16 | mp2an 430 | . . 3 ⊢ (2 < e ↔ (2 ≤ e ∧ 2 # e)) |
| 18 | 4, 14, 17 | mpbir2an 955 | . 2 ⊢ 2 < e |
| 19 | 3 | simpri 113 | . . 3 ⊢ e ≤ 3 |
| 20 | 3z 9652 | . . . 4 ⊢ 3 ∈ ℤ | |
| 21 | zq 10005 | . . . 4 ⊢ (3 ∈ ℤ → 3 ∈ ℚ) | |
| 22 | eirrap 12523 | . . . 4 ⊢ (3 ∈ ℚ → e # 3) | |
| 23 | 20, 21, 22 | mp2b 8 | . . 3 ⊢ e # 3 |
| 24 | 3re 9357 | . . . 4 ⊢ 3 ∈ ℝ | |
| 25 | ltleap 8950 | . . . 4 ⊢ ((e ∈ ℝ ∧ 3 ∈ ℝ) → (e < 3 ↔ (e ≤ 3 ∧ e # 3))) | |
| 26 | 9, 24, 25 | mp2an 430 | . . 3 ⊢ (e < 3 ↔ (e ≤ 3 ∧ e # 3)) |
| 27 | 19, 23, 26 | mpbir2an 955 | . 2 ⊢ e < 3 |
| 28 | 18, 27 | pm3.2i 272 | 1 ⊢ (2 < e ∧ e < 3) |
| Colors of variables: wff set class |
| Syntax hints: ∧ wa 104 ↔ wb 105 ∈ wcel 2209 class class class wbr 4125 ↦ cmpt 4187 ‘cfv 5372 (class class class)co 6075 ℂcc 8167 ℝcr 8168 1c1 8170 · cmul 8174 < clt 8350 ≤ cle 8351 # cap 8899 / cdiv 8992 ℕcn 9283 2c2 9334 3c3 9335 ℕ0cn0 9542 ℤcz 9623 ℚcq 9998 ↑cexp 10953 !cfa 11141 eceu 12388 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 623 ax-in2 624 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-14 2212 ax-ext 2220 ax-coll 4241 ax-sep 4244 ax-nul 4254 ax-pow 4306 ax-pr 4341 ax-un 4573 ax-setind 4679 ax-iinf 4730 ax-cnex 8260 ax-resscn 8261 ax-1cn 8262 ax-1re 8263 ax-icn 8264 ax-addcl 8265 ax-addrcl 8266 ax-mulcl 8267 ax-mulrcl 8268 ax-addcom 8269 ax-mulcom 8270 ax-addass 8271 ax-mulass 8272 ax-distr 8273 ax-i2m1 8274 ax-0lt1 8275 ax-1rid 8276 ax-0id 8277 ax-rnegex 8278 ax-precex 8279 ax-cnre 8280 ax-pre-ltirr 8281 ax-pre-ltwlin 8282 ax-pre-lttrn 8283 ax-pre-apti 8284 ax-pre-ltadd 8285 ax-pre-mulgt0 8286 ax-pre-mulext 8287 ax-arch 8288 ax-caucvg 8289 |
| This theorem depends on definitions: df-bi 117 df-dc 847 df-3or 1010 df-3an 1011 df-tru 1405 df-fal 1408 df-nf 1514 df-sb 1816 df-eu 2089 df-mo 2090 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-ne 2421 df-nel 2516 df-ral 2533 df-rex 2534 df-reu 2535 df-rmo 2536 df-rab 2537 df-v 2823 df-sbc 3052 df-csb 3148 df-dif 3222 df-un 3224 df-in 3226 df-ss 3233 df-nul 3521 df-if 3636 df-pw 3687 df-sn 3711 df-pr 3712 df-op 3714 df-uni 3931 df-int 3966 df-iun 4009 df-br 4126 df-opab 4188 df-mpt 4189 df-tr 4225 df-id 4433 df-po 4436 df-iso 4437 df-iord 4506 df-on 4508 df-ilim 4509 df-suc 4511 df-iom 4733 df-xp 4775 df-rel 4776 df-cnv 4777 df-co 4778 df-dm 4779 df-rn 4780 df-res 4781 df-ima 4782 df-iota 5332 df-fun 5374 df-fn 5375 df-f 5376 df-f1 5377 df-fo 5378 df-f1o 5379 df-fv 5380 df-isom 5381 df-riota 6028 df-ov 6078 df-oprab 6079 df-mpo 6080 df-1st 6364 df-2nd 6365 df-recs 6566 df-irdg 6631 df-frec 6652 df-1o 6677 df-oadd 6681 df-er 6797 df-en 7013 df-dom 7014 df-fin 7015 df-pnf 8352 df-mnf 8353 df-xr 8354 df-ltxr 8355 df-le 8356 df-sub 8489 df-neg 8490 df-reap 8893 df-ap 8900 df-div 8993 df-inn 9284 df-2 9342 df-3 9343 df-4 9344 df-n0 9543 df-z 9624 df-uz 9901 df-q 9999 df-rp 10034 df-ico 10275 df-fz 10391 df-fzo 10528 df-seqfrec 10863 df-exp 10954 df-fac 11142 df-bc 11164 df-ihash 11193 df-shft 11558 df-cj 11585 df-re 11586 df-im 11587 df-rsqrt 11742 df-abs 11743 df-clim 12023 df-sumdc 12098 df-ef 12393 df-e 12394 |
| This theorem is referenced by: epos 12526 ene1 12530 eap1 12531 reeff1o 15797 |
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