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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 2232 | . . . . 5 ⊢ (𝑛 ∈ ℕ ↦ (2 · ((1 / 2)↑𝑛))) = (𝑛 ∈ ℕ ↦ (2 · ((1 / 2)↑𝑛))) | |
| 2 | eqid 2232 | . . . . 5 ⊢ (𝑛 ∈ ℕ0 ↦ (1 / (!‘𝑛))) = (𝑛 ∈ ℕ0 ↦ (1 / (!‘𝑛))) | |
| 3 | 1, 2 | ege2le3 12357 | . . . 4 ⊢ (2 ≤ e ∧ e ≤ 3) |
| 4 | 3 | simpli 111 | . . 3 ⊢ 2 ≤ e |
| 5 | 2z 9605 | . . . . 5 ⊢ 2 ∈ ℤ | |
| 6 | zq 9958 | . . . . 5 ⊢ (2 ∈ ℤ → 2 ∈ ℚ) | |
| 7 | eirrap 12464 | . . . . 5 ⊢ (2 ∈ ℚ → e # 2) | |
| 8 | 5, 6, 7 | mp2b 8 | . . . 4 ⊢ e # 2 |
| 9 | ere 12356 | . . . . . 6 ⊢ e ∈ ℝ | |
| 10 | 9 | recni 8286 | . . . . 5 ⊢ e ∈ ℂ |
| 11 | 2cn 9308 | . . . . 5 ⊢ 2 ∈ ℂ | |
| 12 | apsym 8880 | . . . . 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 9307 | . . . 4 ⊢ 2 ∈ ℝ | |
| 16 | ltleap 8906 | . . . 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 951 | . 2 ⊢ 2 < e |
| 19 | 3 | simpri 113 | . . 3 ⊢ e ≤ 3 |
| 20 | 3z 9606 | . . . 4 ⊢ 3 ∈ ℤ | |
| 21 | zq 9958 | . . . 4 ⊢ (3 ∈ ℤ → 3 ∈ ℚ) | |
| 22 | eirrap 12464 | . . . 4 ⊢ (3 ∈ ℚ → e # 3) | |
| 23 | 20, 21, 22 | mp2b 8 | . . 3 ⊢ e # 3 |
| 24 | 3re 9311 | . . . 4 ⊢ 3 ∈ ℝ | |
| 25 | ltleap 8906 | . . . 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 951 | . 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 2203 class class class wbr 4109 ↦ cmpt 4171 ‘cfv 5352 (class class class)co 6050 ℂcc 8125 ℝcr 8126 1c1 8128 · cmul 8132 < clt 8308 ≤ cle 8309 # cap 8855 / cdiv 8946 ℕcn 9237 2c2 9288 3c3 9289 ℕ0cn0 9496 ℤcz 9577 ℚcq 9951 ↑cexp 10900 !cfa 11087 eceu 12329 |
| 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 619 ax-in2 620 ax-io 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-13 2205 ax-14 2206 ax-ext 2214 ax-coll 4225 ax-sep 4228 ax-nul 4236 ax-pow 4287 ax-pr 4322 ax-un 4554 ax-setind 4659 ax-iinf 4710 ax-cnex 8218 ax-resscn 8219 ax-1cn 8220 ax-1re 8221 ax-icn 8222 ax-addcl 8223 ax-addrcl 8224 ax-mulcl 8225 ax-mulrcl 8226 ax-addcom 8227 ax-mulcom 8228 ax-addass 8229 ax-mulass 8230 ax-distr 8231 ax-i2m1 8232 ax-0lt1 8233 ax-1rid 8234 ax-0id 8235 ax-rnegex 8236 ax-precex 8237 ax-cnre 8238 ax-pre-ltirr 8239 ax-pre-ltwlin 8240 ax-pre-lttrn 8241 ax-pre-apti 8242 ax-pre-ltadd 8243 ax-pre-mulgt0 8244 ax-pre-mulext 8245 ax-arch 8246 ax-caucvg 8247 |
| This theorem depends on definitions: df-bi 117 df-dc 843 df-3or 1006 df-3an 1007 df-tru 1401 df-fal 1404 df-nf 1510 df-sb 1812 df-eu 2083 df-mo 2084 df-clab 2219 df-cleq 2225 df-clel 2228 df-nfc 2373 df-ne 2413 df-nel 2508 df-ral 2525 df-rex 2526 df-reu 2527 df-rmo 2528 df-rab 2529 df-v 2815 df-sbc 3043 df-csb 3139 df-dif 3213 df-un 3215 df-in 3217 df-ss 3224 df-nul 3509 df-if 3621 df-pw 3671 df-sn 3695 df-pr 3696 df-op 3698 df-uni 3915 df-int 3950 df-iun 3993 df-br 4110 df-opab 4172 df-mpt 4173 df-tr 4209 df-id 4414 df-po 4417 df-iso 4418 df-iord 4487 df-on 4489 df-ilim 4490 df-suc 4492 df-iom 4713 df-xp 4755 df-rel 4756 df-cnv 4757 df-co 4758 df-dm 4759 df-rn 4760 df-res 4761 df-ima 4762 df-iota 5312 df-fun 5354 df-fn 5355 df-f 5356 df-f1 5357 df-fo 5358 df-f1o 5359 df-fv 5360 df-isom 5361 df-riota 6003 df-ov 6053 df-oprab 6054 df-mpo 6055 df-1st 6334 df-2nd 6335 df-recs 6536 df-irdg 6601 df-frec 6622 df-1o 6647 df-oadd 6651 df-er 6767 df-en 6976 df-dom 6977 df-fin 6978 df-pnf 8310 df-mnf 8311 df-xr 8312 df-ltxr 8313 df-le 8314 df-sub 8446 df-neg 8447 df-reap 8849 df-ap 8856 df-div 8947 df-inn 9238 df-2 9296 df-3 9297 df-4 9298 df-n0 9497 df-z 9578 df-uz 9854 df-q 9952 df-rp 9987 df-ico 10227 df-fz 10343 df-fzo 10477 df-seqfrec 10810 df-exp 10901 df-fac 11088 df-bc 11110 df-ihash 11139 df-shft 11500 df-cj 11527 df-re 11528 df-im 11529 df-rsqrt 11683 df-abs 11684 df-clim 11964 df-sumdc 12039 df-ef 12334 df-e 12335 |
| This theorem is referenced by: epos 12467 ene1 12471 eap1 12472 reeff1o 15638 |
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