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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 2139 | . . . . 5 ⊢ (𝑛 ∈ ℕ ↦ (2 · ((1 / 2)↑𝑛))) = (𝑛 ∈ ℕ ↦ (2 · ((1 / 2)↑𝑛))) | |
2 | eqid 2139 | . . . . 5 ⊢ (𝑛 ∈ ℕ0 ↦ (1 / (!‘𝑛))) = (𝑛 ∈ ℕ0 ↦ (1 / (!‘𝑛))) | |
3 | 1, 2 | ege2le3 11377 | . . . 4 ⊢ (2 ≤ e ∧ e ≤ 3) |
4 | 3 | simpli 110 | . . 3 ⊢ 2 ≤ e |
5 | 2z 9082 | . . . . 5 ⊢ 2 ∈ ℤ | |
6 | zq 9418 | . . . . 5 ⊢ (2 ∈ ℤ → 2 ∈ ℚ) | |
7 | eirrap 11484 | . . . . 5 ⊢ (2 ∈ ℚ → e # 2) | |
8 | 5, 6, 7 | mp2b 8 | . . . 4 ⊢ e # 2 |
9 | ere 11376 | . . . . . 6 ⊢ e ∈ ℝ | |
10 | 9 | recni 7778 | . . . . 5 ⊢ e ∈ ℂ |
11 | 2cn 8791 | . . . . 5 ⊢ 2 ∈ ℂ | |
12 | apsym 8368 | . . . . 5 ⊢ ((e ∈ ℂ ∧ 2 ∈ ℂ) → (e # 2 ↔ 2 # e)) | |
13 | 10, 11, 12 | mp2an 422 | . . . 4 ⊢ (e # 2 ↔ 2 # e) |
14 | 8, 13 | mpbi 144 | . . 3 ⊢ 2 # e |
15 | 2re 8790 | . . . 4 ⊢ 2 ∈ ℝ | |
16 | ltleap 8394 | . . . 4 ⊢ ((2 ∈ ℝ ∧ e ∈ ℝ) → (2 < e ↔ (2 ≤ e ∧ 2 # e))) | |
17 | 15, 9, 16 | mp2an 422 | . . 3 ⊢ (2 < e ↔ (2 ≤ e ∧ 2 # e)) |
18 | 4, 14, 17 | mpbir2an 926 | . 2 ⊢ 2 < e |
19 | 3 | simpri 112 | . . 3 ⊢ e ≤ 3 |
20 | 3z 9083 | . . . 4 ⊢ 3 ∈ ℤ | |
21 | zq 9418 | . . . 4 ⊢ (3 ∈ ℤ → 3 ∈ ℚ) | |
22 | eirrap 11484 | . . . 4 ⊢ (3 ∈ ℚ → e # 3) | |
23 | 20, 21, 22 | mp2b 8 | . . 3 ⊢ e # 3 |
24 | 3re 8794 | . . . 4 ⊢ 3 ∈ ℝ | |
25 | ltleap 8394 | . . . 4 ⊢ ((e ∈ ℝ ∧ 3 ∈ ℝ) → (e < 3 ↔ (e ≤ 3 ∧ e # 3))) | |
26 | 9, 24, 25 | mp2an 422 | . . 3 ⊢ (e < 3 ↔ (e ≤ 3 ∧ e # 3)) |
27 | 19, 23, 26 | mpbir2an 926 | . 2 ⊢ e < 3 |
28 | 18, 27 | pm3.2i 270 | 1 ⊢ (2 < e ∧ e < 3) |
Colors of variables: wff set class |
Syntax hints: ∧ wa 103 ↔ wb 104 ∈ wcel 1480 class class class wbr 3929 ↦ cmpt 3989 ‘cfv 5123 (class class class)co 5774 ℂcc 7618 ℝcr 7619 1c1 7621 · cmul 7625 < clt 7800 ≤ cle 7801 # cap 8343 / cdiv 8432 ℕcn 8720 2c2 8771 3c3 8772 ℕ0cn0 8977 ℤcz 9054 ℚcq 9411 ↑cexp 10292 !cfa 10471 eceu 11349 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 603 ax-in2 604 ax-io 698 ax-5 1423 ax-7 1424 ax-gen 1425 ax-ie1 1469 ax-ie2 1470 ax-8 1482 ax-10 1483 ax-11 1484 ax-i12 1485 ax-bndl 1486 ax-4 1487 ax-13 1491 ax-14 1492 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2121 ax-coll 4043 ax-sep 4046 ax-nul 4054 ax-pow 4098 ax-pr 4131 ax-un 4355 ax-setind 4452 ax-iinf 4502 ax-cnex 7711 ax-resscn 7712 ax-1cn 7713 ax-1re 7714 ax-icn 7715 ax-addcl 7716 ax-addrcl 7717 ax-mulcl 7718 ax-mulrcl 7719 ax-addcom 7720 ax-mulcom 7721 ax-addass 7722 ax-mulass 7723 ax-distr 7724 ax-i2m1 7725 ax-0lt1 7726 ax-1rid 7727 ax-0id 7728 ax-rnegex 7729 ax-precex 7730 ax-cnre 7731 ax-pre-ltirr 7732 ax-pre-ltwlin 7733 ax-pre-lttrn 7734 ax-pre-apti 7735 ax-pre-ltadd 7736 ax-pre-mulgt0 7737 ax-pre-mulext 7738 ax-arch 7739 ax-caucvg 7740 |
This theorem depends on definitions: df-bi 116 df-dc 820 df-3or 963 df-3an 964 df-tru 1334 df-fal 1337 df-nf 1437 df-sb 1736 df-eu 2002 df-mo 2003 df-clab 2126 df-cleq 2132 df-clel 2135 df-nfc 2270 df-ne 2309 df-nel 2404 df-ral 2421 df-rex 2422 df-reu 2423 df-rmo 2424 df-rab 2425 df-v 2688 df-sbc 2910 df-csb 3004 df-dif 3073 df-un 3075 df-in 3077 df-ss 3084 df-nul 3364 df-if 3475 df-pw 3512 df-sn 3533 df-pr 3534 df-op 3536 df-uni 3737 df-int 3772 df-iun 3815 df-br 3930 df-opab 3990 df-mpt 3991 df-tr 4027 df-id 4215 df-po 4218 df-iso 4219 df-iord 4288 df-on 4290 df-ilim 4291 df-suc 4293 df-iom 4505 df-xp 4545 df-rel 4546 df-cnv 4547 df-co 4548 df-dm 4549 df-rn 4550 df-res 4551 df-ima 4552 df-iota 5088 df-fun 5125 df-fn 5126 df-f 5127 df-f1 5128 df-fo 5129 df-f1o 5130 df-fv 5131 df-isom 5132 df-riota 5730 df-ov 5777 df-oprab 5778 df-mpo 5779 df-1st 6038 df-2nd 6039 df-recs 6202 df-irdg 6267 df-frec 6288 df-1o 6313 df-oadd 6317 df-er 6429 df-en 6635 df-dom 6636 df-fin 6637 df-pnf 7802 df-mnf 7803 df-xr 7804 df-ltxr 7805 df-le 7806 df-sub 7935 df-neg 7936 df-reap 8337 df-ap 8344 df-div 8433 df-inn 8721 df-2 8779 df-3 8780 df-4 8781 df-n0 8978 df-z 9055 df-uz 9327 df-q 9412 df-rp 9442 df-ico 9677 df-fz 9791 df-fzo 9920 df-seqfrec 10219 df-exp 10293 df-fac 10472 df-bc 10494 df-ihash 10522 df-shft 10587 df-cj 10614 df-re 10615 df-im 10616 df-rsqrt 10770 df-abs 10771 df-clim 11048 df-sumdc 11123 df-ef 11354 df-e 11355 |
This theorem is referenced by: epos 11487 ene1 11491 eap1 11492 |
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