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Mirrors > Home > MPE Home > Th. List > eflt | Structured version Visualization version GIF version |
Description: The exponential function on the reals is strictly increasing. (Contributed by Paul Chapman, 21-Aug-2007.) (Revised by Mario Carneiro, 17-Jul-2014.) |
Ref | Expression |
---|---|
eflt | ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝐴 < 𝐵 ↔ (exp‘𝐴) < (exp‘𝐵))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | tru 1547 | . 2 ⊢ ⊤ | |
2 | fveq2 6736 | . . 3 ⊢ (𝑥 = 𝑦 → (exp‘𝑥) = (exp‘𝑦)) | |
3 | fveq2 6736 | . . 3 ⊢ (𝑥 = 𝐴 → (exp‘𝑥) = (exp‘𝐴)) | |
4 | fveq2 6736 | . . 3 ⊢ (𝑥 = 𝐵 → (exp‘𝑥) = (exp‘𝐵)) | |
5 | ssid 3938 | . . 3 ⊢ ℝ ⊆ ℝ | |
6 | reefcl 15676 | . . . 4 ⊢ (𝑥 ∈ ℝ → (exp‘𝑥) ∈ ℝ) | |
7 | 6 | adantl 485 | . . 3 ⊢ ((⊤ ∧ 𝑥 ∈ ℝ) → (exp‘𝑥) ∈ ℝ) |
8 | simp2 1139 | . . . . . . . . . 10 ⊢ ((𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ∧ 𝑥 < 𝑦) → 𝑦 ∈ ℝ) | |
9 | simp1 1138 | . . . . . . . . . 10 ⊢ ((𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ∧ 𝑥 < 𝑦) → 𝑥 ∈ ℝ) | |
10 | 8, 9 | resubcld 11285 | . . . . . . . . 9 ⊢ ((𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ∧ 𝑥 < 𝑦) → (𝑦 − 𝑥) ∈ ℝ) |
11 | posdif 11350 | . . . . . . . . . 10 ⊢ ((𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ) → (𝑥 < 𝑦 ↔ 0 < (𝑦 − 𝑥))) | |
12 | 11 | biimp3a 1471 | . . . . . . . . 9 ⊢ ((𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ∧ 𝑥 < 𝑦) → 0 < (𝑦 − 𝑥)) |
13 | 10, 12 | elrpd 12650 | . . . . . . . 8 ⊢ ((𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ∧ 𝑥 < 𝑦) → (𝑦 − 𝑥) ∈ ℝ+) |
14 | efgt1 15705 | . . . . . . . 8 ⊢ ((𝑦 − 𝑥) ∈ ℝ+ → 1 < (exp‘(𝑦 − 𝑥))) | |
15 | 13, 14 | syl 17 | . . . . . . 7 ⊢ ((𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ∧ 𝑥 < 𝑦) → 1 < (exp‘(𝑦 − 𝑥))) |
16 | 9 | reefcld 15677 | . . . . . . . 8 ⊢ ((𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ∧ 𝑥 < 𝑦) → (exp‘𝑥) ∈ ℝ) |
17 | 10 | reefcld 15677 | . . . . . . . 8 ⊢ ((𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ∧ 𝑥 < 𝑦) → (exp‘(𝑦 − 𝑥)) ∈ ℝ) |
18 | efgt0 15692 | . . . . . . . . 9 ⊢ (𝑥 ∈ ℝ → 0 < (exp‘𝑥)) | |
19 | 9, 18 | syl 17 | . . . . . . . 8 ⊢ ((𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ∧ 𝑥 < 𝑦) → 0 < (exp‘𝑥)) |
20 | ltmulgt11 11717 | . . . . . . . 8 ⊢ (((exp‘𝑥) ∈ ℝ ∧ (exp‘(𝑦 − 𝑥)) ∈ ℝ ∧ 0 < (exp‘𝑥)) → (1 < (exp‘(𝑦 − 𝑥)) ↔ (exp‘𝑥) < ((exp‘𝑥) · (exp‘(𝑦 − 𝑥))))) | |
21 | 16, 17, 19, 20 | syl3anc 1373 | . . . . . . 7 ⊢ ((𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ∧ 𝑥 < 𝑦) → (1 < (exp‘(𝑦 − 𝑥)) ↔ (exp‘𝑥) < ((exp‘𝑥) · (exp‘(𝑦 − 𝑥))))) |
22 | 15, 21 | mpbid 235 | . . . . . 6 ⊢ ((𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ∧ 𝑥 < 𝑦) → (exp‘𝑥) < ((exp‘𝑥) · (exp‘(𝑦 − 𝑥)))) |
23 | 9 | recnd 10886 | . . . . . . . 8 ⊢ ((𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ∧ 𝑥 < 𝑦) → 𝑥 ∈ ℂ) |
24 | 10 | recnd 10886 | . . . . . . . 8 ⊢ ((𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ∧ 𝑥 < 𝑦) → (𝑦 − 𝑥) ∈ ℂ) |
25 | efadd 15683 | . . . . . . . 8 ⊢ ((𝑥 ∈ ℂ ∧ (𝑦 − 𝑥) ∈ ℂ) → (exp‘(𝑥 + (𝑦 − 𝑥))) = ((exp‘𝑥) · (exp‘(𝑦 − 𝑥)))) | |
26 | 23, 24, 25 | syl2anc 587 | . . . . . . 7 ⊢ ((𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ∧ 𝑥 < 𝑦) → (exp‘(𝑥 + (𝑦 − 𝑥))) = ((exp‘𝑥) · (exp‘(𝑦 − 𝑥)))) |
27 | 8 | recnd 10886 | . . . . . . . . 9 ⊢ ((𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ∧ 𝑥 < 𝑦) → 𝑦 ∈ ℂ) |
28 | 23, 27 | pncan3d 11217 | . . . . . . . 8 ⊢ ((𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ∧ 𝑥 < 𝑦) → (𝑥 + (𝑦 − 𝑥)) = 𝑦) |
29 | 28 | fveq2d 6740 | . . . . . . 7 ⊢ ((𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ∧ 𝑥 < 𝑦) → (exp‘(𝑥 + (𝑦 − 𝑥))) = (exp‘𝑦)) |
30 | 26, 29 | eqtr3d 2780 | . . . . . 6 ⊢ ((𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ∧ 𝑥 < 𝑦) → ((exp‘𝑥) · (exp‘(𝑦 − 𝑥))) = (exp‘𝑦)) |
31 | 22, 30 | breqtrd 5094 | . . . . 5 ⊢ ((𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ∧ 𝑥 < 𝑦) → (exp‘𝑥) < (exp‘𝑦)) |
32 | 31 | 3expia 1123 | . . . 4 ⊢ ((𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ) → (𝑥 < 𝑦 → (exp‘𝑥) < (exp‘𝑦))) |
33 | 32 | adantl 485 | . . 3 ⊢ ((⊤ ∧ (𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ)) → (𝑥 < 𝑦 → (exp‘𝑥) < (exp‘𝑦))) |
34 | 2, 3, 4, 5, 7, 33 | ltord1 11383 | . 2 ⊢ ((⊤ ∧ (𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ)) → (𝐴 < 𝐵 ↔ (exp‘𝐴) < (exp‘𝐵))) |
35 | 1, 34 | mpan 690 | 1 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝐴 < 𝐵 ↔ (exp‘𝐴) < (exp‘𝐵))) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 209 ∧ wa 399 ∧ w3a 1089 = wceq 1543 ⊤wtru 1544 ∈ wcel 2111 class class class wbr 5068 ‘cfv 6398 (class class class)co 7232 ℂcc 10752 ℝcr 10753 0cc0 10754 1c1 10755 + caddc 10757 · cmul 10759 < clt 10892 − cmin 11087 ℝ+crp 12611 expce 15651 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1803 ax-4 1817 ax-5 1918 ax-6 1976 ax-7 2016 ax-8 2113 ax-9 2121 ax-10 2142 ax-11 2159 ax-12 2176 ax-ext 2709 ax-rep 5194 ax-sep 5207 ax-nul 5214 ax-pow 5273 ax-pr 5337 ax-un 7542 ax-inf2 9281 ax-cnex 10810 ax-resscn 10811 ax-1cn 10812 ax-icn 10813 ax-addcl 10814 ax-addrcl 10815 ax-mulcl 10816 ax-mulrcl 10817 ax-mulcom 10818 ax-addass 10819 ax-mulass 10820 ax-distr 10821 ax-i2m1 10822 ax-1ne0 10823 ax-1rid 10824 ax-rnegex 10825 ax-rrecex 10826 ax-cnre 10827 ax-pre-lttri 10828 ax-pre-lttrn 10829 ax-pre-ltadd 10830 ax-pre-mulgt0 10831 ax-pre-sup 10832 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 848 df-3or 1090 df-3an 1091 df-tru 1546 df-fal 1556 df-ex 1788 df-nf 1792 df-sb 2072 df-mo 2540 df-eu 2569 df-clab 2716 df-cleq 2730 df-clel 2817 df-nfc 2887 df-ne 2942 df-nel 3048 df-ral 3067 df-rex 3068 df-reu 3069 df-rmo 3070 df-rab 3071 df-v 3423 df-sbc 3710 df-csb 3827 df-dif 3884 df-un 3886 df-in 3888 df-ss 3898 df-pss 3900 df-nul 4253 df-if 4455 df-pw 4530 df-sn 4557 df-pr 4559 df-tp 4561 df-op 4563 df-uni 4835 df-int 4875 df-iun 4921 df-br 5069 df-opab 5131 df-mpt 5151 df-tr 5177 df-id 5470 df-eprel 5475 df-po 5483 df-so 5484 df-fr 5524 df-se 5525 df-we 5526 df-xp 5572 df-rel 5573 df-cnv 5574 df-co 5575 df-dm 5576 df-rn 5577 df-res 5578 df-ima 5579 df-pred 6176 df-ord 6234 df-on 6235 df-lim 6236 df-suc 6237 df-iota 6356 df-fun 6400 df-fn 6401 df-f 6402 df-f1 6403 df-fo 6404 df-f1o 6405 df-fv 6406 df-isom 6407 df-riota 7189 df-ov 7235 df-oprab 7236 df-mpo 7237 df-om 7664 df-1st 7780 df-2nd 7781 df-wrecs 8068 df-recs 8129 df-rdg 8167 df-1o 8223 df-er 8412 df-pm 8532 df-en 8648 df-dom 8649 df-sdom 8650 df-fin 8651 df-sup 9083 df-inf 9084 df-oi 9151 df-card 9580 df-pnf 10894 df-mnf 10895 df-xr 10896 df-ltxr 10897 df-le 10898 df-sub 11089 df-neg 11090 df-div 11515 df-nn 11856 df-2 11918 df-3 11919 df-n0 12116 df-z 12202 df-uz 12464 df-rp 12612 df-ico 12966 df-fz 13121 df-fzo 13264 df-fl 13392 df-seq 13602 df-exp 13663 df-fac 13868 df-bc 13897 df-hash 13925 df-shft 14658 df-cj 14690 df-re 14691 df-im 14692 df-sqrt 14826 df-abs 14827 df-limsup 15060 df-clim 15077 df-rlim 15078 df-sum 15278 df-ef 15657 |
This theorem is referenced by: efle 15707 reefiso 25367 logdivlti 25535 divlogrlim 25550 cxplt 25609 birthday 25864 cxploglim 25887 bposlem6 26197 bposlem9 26200 pntpbnd1a 26493 pntibndlem2 26499 pntlemb 26505 ostth2lem3 26543 ostth2 26545 |
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