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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 12222 | . . . 4 ⊢ (2 ≤ e ∧ e ≤ 3) |
| 4 | 3 | simpli 111 | . . 3 ⊢ 2 ≤ e |
| 5 | 2z 9497 | . . . . 5 ⊢ 2 ∈ ℤ | |
| 6 | zq 9850 | . . . . 5 ⊢ (2 ∈ ℤ → 2 ∈ ℚ) | |
| 7 | eirrap 12329 | . . . . 5 ⊢ (2 ∈ ℚ → e # 2) | |
| 8 | 5, 6, 7 | mp2b 8 | . . . 4 ⊢ e # 2 |
| 9 | ere 12221 | . . . . . 6 ⊢ e ∈ ℝ | |
| 10 | 9 | recni 8181 | . . . . 5 ⊢ e ∈ ℂ |
| 11 | 2cn 9204 | . . . . 5 ⊢ 2 ∈ ℂ | |
| 12 | apsym 8776 | . . . . 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 9203 | . . . 4 ⊢ 2 ∈ ℝ | |
| 16 | ltleap 8802 | . . . 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 9498 | . . . 4 ⊢ 3 ∈ ℤ | |
| 21 | zq 9850 | . . . 4 ⊢ (3 ∈ ℤ → 3 ∈ ℚ) | |
| 22 | eirrap 12329 | . . . 4 ⊢ (3 ∈ ℚ → e # 3) | |
| 23 | 20, 21, 22 | mp2b 8 | . . 3 ⊢ e # 3 |
| 24 | 3re 9207 | . . . 4 ⊢ 3 ∈ ℝ | |
| 25 | ltleap 8802 | . . . 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 4086 ↦ cmpt 4148 ‘cfv 5324 (class class class)co 6013 ℂcc 8020 ℝcr 8021 1c1 8023 · cmul 8027 < clt 8204 ≤ cle 8205 # cap 8751 / cdiv 8842 ℕcn 9133 2c2 9184 3c3 9185 ℕ0cn0 9392 ℤcz 9469 ℚcq 9843 ↑cexp 10790 !cfa 10977 eceu 12194 |
| 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 4202 ax-sep 4205 ax-nul 4213 ax-pow 4262 ax-pr 4297 ax-un 4528 ax-setind 4633 ax-iinf 4684 ax-cnex 8113 ax-resscn 8114 ax-1cn 8115 ax-1re 8116 ax-icn 8117 ax-addcl 8118 ax-addrcl 8119 ax-mulcl 8120 ax-mulrcl 8121 ax-addcom 8122 ax-mulcom 8123 ax-addass 8124 ax-mulass 8125 ax-distr 8126 ax-i2m1 8127 ax-0lt1 8128 ax-1rid 8129 ax-0id 8130 ax-rnegex 8131 ax-precex 8132 ax-cnre 8133 ax-pre-ltirr 8134 ax-pre-ltwlin 8135 ax-pre-lttrn 8136 ax-pre-apti 8137 ax-pre-ltadd 8138 ax-pre-mulgt0 8139 ax-pre-mulext 8140 ax-arch 8141 ax-caucvg 8142 |
| 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 2802 df-sbc 3030 df-csb 3126 df-dif 3200 df-un 3202 df-in 3204 df-ss 3211 df-nul 3493 df-if 3604 df-pw 3652 df-sn 3673 df-pr 3674 df-op 3676 df-uni 3892 df-int 3927 df-iun 3970 df-br 4087 df-opab 4149 df-mpt 4150 df-tr 4186 df-id 4388 df-po 4391 df-iso 4392 df-iord 4461 df-on 4463 df-ilim 4464 df-suc 4466 df-iom 4687 df-xp 4729 df-rel 4730 df-cnv 4731 df-co 4732 df-dm 4733 df-rn 4734 df-res 4735 df-ima 4736 df-iota 5284 df-fun 5326 df-fn 5327 df-f 5328 df-f1 5329 df-fo 5330 df-f1o 5331 df-fv 5332 df-isom 5333 df-riota 5966 df-ov 6016 df-oprab 6017 df-mpo 6018 df-1st 6298 df-2nd 6299 df-recs 6466 df-irdg 6531 df-frec 6552 df-1o 6577 df-oadd 6581 df-er 6697 df-en 6905 df-dom 6906 df-fin 6907 df-pnf 8206 df-mnf 8207 df-xr 8208 df-ltxr 8209 df-le 8210 df-sub 8342 df-neg 8343 df-reap 8745 df-ap 8752 df-div 8843 df-inn 9134 df-2 9192 df-3 9193 df-4 9194 df-n0 9393 df-z 9470 df-uz 9746 df-q 9844 df-rp 9879 df-ico 10119 df-fz 10234 df-fzo 10368 df-seqfrec 10700 df-exp 10791 df-fac 10978 df-bc 11000 df-ihash 11028 df-shft 11366 df-cj 11393 df-re 11394 df-im 11395 df-rsqrt 11549 df-abs 11550 df-clim 11830 df-sumdc 11905 df-ef 12199 df-e 12200 |
| This theorem is referenced by: epos 12332 ene1 12336 eap1 12337 reeff1o 15487 |
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