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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 2229 | . . . . 5 ⊢ (𝑛 ∈ ℕ ↦ (2 · ((1 / 2)↑𝑛))) = (𝑛 ∈ ℕ ↦ (2 · ((1 / 2)↑𝑛))) | |
| 2 | eqid 2229 | . . . . 5 ⊢ (𝑛 ∈ ℕ0 ↦ (1 / (!‘𝑛))) = (𝑛 ∈ ℕ0 ↦ (1 / (!‘𝑛))) | |
| 3 | 1, 2 | ege2le3 12197 | . . . 4 ⊢ (2 ≤ e ∧ e ≤ 3) |
| 4 | 3 | simpli 111 | . . 3 ⊢ 2 ≤ e |
| 5 | 2z 9485 | . . . . 5 ⊢ 2 ∈ ℤ | |
| 6 | zq 9833 | . . . . 5 ⊢ (2 ∈ ℤ → 2 ∈ ℚ) | |
| 7 | eirrap 12304 | . . . . 5 ⊢ (2 ∈ ℚ → e # 2) | |
| 8 | 5, 6, 7 | mp2b 8 | . . . 4 ⊢ e # 2 |
| 9 | ere 12196 | . . . . . 6 ⊢ e ∈ ℝ | |
| 10 | 9 | recni 8169 | . . . . 5 ⊢ e ∈ ℂ |
| 11 | 2cn 9192 | . . . . 5 ⊢ 2 ∈ ℂ | |
| 12 | apsym 8764 | . . . . 5 ⊢ ((e ∈ ℂ ∧ 2 ∈ ℂ) → (e # 2 ↔ 2 # e)) | |
| 13 | 10, 11, 12 | mp2an 426 | . . . 4 ⊢ (e # 2 ↔ 2 # e) |
| 14 | 8, 13 | mpbi 145 | . . 3 ⊢ 2 # e |
| 15 | 2re 9191 | . . . 4 ⊢ 2 ∈ ℝ | |
| 16 | ltleap 8790 | . . . 4 ⊢ ((2 ∈ ℝ ∧ e ∈ ℝ) → (2 < e ↔ (2 ≤ e ∧ 2 # e))) | |
| 17 | 15, 9, 16 | mp2an 426 | . . 3 ⊢ (2 < e ↔ (2 ≤ e ∧ 2 # e)) |
| 18 | 4, 14, 17 | mpbir2an 948 | . 2 ⊢ 2 < e |
| 19 | 3 | simpri 113 | . . 3 ⊢ e ≤ 3 |
| 20 | 3z 9486 | . . . 4 ⊢ 3 ∈ ℤ | |
| 21 | zq 9833 | . . . 4 ⊢ (3 ∈ ℤ → 3 ∈ ℚ) | |
| 22 | eirrap 12304 | . . . 4 ⊢ (3 ∈ ℚ → e # 3) | |
| 23 | 20, 21, 22 | mp2b 8 | . . 3 ⊢ e # 3 |
| 24 | 3re 9195 | . . . 4 ⊢ 3 ∈ ℝ | |
| 25 | ltleap 8790 | . . . 4 ⊢ ((e ∈ ℝ ∧ 3 ∈ ℝ) → (e < 3 ↔ (e ≤ 3 ∧ e # 3))) | |
| 26 | 9, 24, 25 | mp2an 426 | . . 3 ⊢ (e < 3 ↔ (e ≤ 3 ∧ e # 3)) |
| 27 | 19, 23, 26 | mpbir2an 948 | . 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 2200 class class class wbr 4083 ↦ cmpt 4145 ‘cfv 5318 (class class class)co 6007 ℂcc 8008 ℝcr 8009 1c1 8011 · cmul 8015 < clt 8192 ≤ cle 8193 # cap 8739 / cdiv 8830 ℕcn 9121 2c2 9172 3c3 9173 ℕ0cn0 9380 ℤcz 9457 ℚcq 9826 ↑cexp 10772 !cfa 10959 eceu 12169 |
| 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 617 ax-in2 618 ax-io 714 ax-5 1493 ax-7 1494 ax-gen 1495 ax-ie1 1539 ax-ie2 1540 ax-8 1550 ax-10 1551 ax-11 1552 ax-i12 1553 ax-bndl 1555 ax-4 1556 ax-17 1572 ax-i9 1576 ax-ial 1580 ax-i5r 1581 ax-13 2202 ax-14 2203 ax-ext 2211 ax-coll 4199 ax-sep 4202 ax-nul 4210 ax-pow 4258 ax-pr 4293 ax-un 4524 ax-setind 4629 ax-iinf 4680 ax-cnex 8101 ax-resscn 8102 ax-1cn 8103 ax-1re 8104 ax-icn 8105 ax-addcl 8106 ax-addrcl 8107 ax-mulcl 8108 ax-mulrcl 8109 ax-addcom 8110 ax-mulcom 8111 ax-addass 8112 ax-mulass 8113 ax-distr 8114 ax-i2m1 8115 ax-0lt1 8116 ax-1rid 8117 ax-0id 8118 ax-rnegex 8119 ax-precex 8120 ax-cnre 8121 ax-pre-ltirr 8122 ax-pre-ltwlin 8123 ax-pre-lttrn 8124 ax-pre-apti 8125 ax-pre-ltadd 8126 ax-pre-mulgt0 8127 ax-pre-mulext 8128 ax-arch 8129 ax-caucvg 8130 |
| This theorem depends on definitions: df-bi 117 df-dc 840 df-3or 1003 df-3an 1004 df-tru 1398 df-fal 1401 df-nf 1507 df-sb 1809 df-eu 2080 df-mo 2081 df-clab 2216 df-cleq 2222 df-clel 2225 df-nfc 2361 df-ne 2401 df-nel 2496 df-ral 2513 df-rex 2514 df-reu 2515 df-rmo 2516 df-rab 2517 df-v 2801 df-sbc 3029 df-csb 3125 df-dif 3199 df-un 3201 df-in 3203 df-ss 3210 df-nul 3492 df-if 3603 df-pw 3651 df-sn 3672 df-pr 3673 df-op 3675 df-uni 3889 df-int 3924 df-iun 3967 df-br 4084 df-opab 4146 df-mpt 4147 df-tr 4183 df-id 4384 df-po 4387 df-iso 4388 df-iord 4457 df-on 4459 df-ilim 4460 df-suc 4462 df-iom 4683 df-xp 4725 df-rel 4726 df-cnv 4727 df-co 4728 df-dm 4729 df-rn 4730 df-res 4731 df-ima 4732 df-iota 5278 df-fun 5320 df-fn 5321 df-f 5322 df-f1 5323 df-fo 5324 df-f1o 5325 df-fv 5326 df-isom 5327 df-riota 5960 df-ov 6010 df-oprab 6011 df-mpo 6012 df-1st 6292 df-2nd 6293 df-recs 6457 df-irdg 6522 df-frec 6543 df-1o 6568 df-oadd 6572 df-er 6688 df-en 6896 df-dom 6897 df-fin 6898 df-pnf 8194 df-mnf 8195 df-xr 8196 df-ltxr 8197 df-le 8198 df-sub 8330 df-neg 8331 df-reap 8733 df-ap 8740 df-div 8831 df-inn 9122 df-2 9180 df-3 9181 df-4 9182 df-n0 9381 df-z 9458 df-uz 9734 df-q 9827 df-rp 9862 df-ico 10102 df-fz 10217 df-fzo 10351 df-seqfrec 10682 df-exp 10773 df-fac 10960 df-bc 10982 df-ihash 11010 df-shft 11341 df-cj 11368 df-re 11369 df-im 11370 df-rsqrt 11524 df-abs 11525 df-clim 11805 df-sumdc 11880 df-ef 12174 df-e 12175 |
| This theorem is referenced by: epos 12307 ene1 12311 eap1 12312 reeff1o 15462 |
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