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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 monotonic. (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 1479 | . 2 ⊢ ⊤ | |
2 | fveq2 6103 | . . 3 ⊢ (𝑥 = 𝑦 → (exp‘𝑥) = (exp‘𝑦)) | |
3 | fveq2 6103 | . . 3 ⊢ (𝑥 = 𝐴 → (exp‘𝑥) = (exp‘𝐴)) | |
4 | fveq2 6103 | . . 3 ⊢ (𝑥 = 𝐵 → (exp‘𝑥) = (exp‘𝐵)) | |
5 | ssid 3587 | . . 3 ⊢ ℝ ⊆ ℝ | |
6 | reefcl 14656 | . . . 4 ⊢ (𝑥 ∈ ℝ → (exp‘𝑥) ∈ ℝ) | |
7 | 6 | adantl 481 | . . 3 ⊢ ((⊤ ∧ 𝑥 ∈ ℝ) → (exp‘𝑥) ∈ ℝ) |
8 | simp2 1055 | . . . . . . . . . 10 ⊢ ((𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ∧ 𝑥 < 𝑦) → 𝑦 ∈ ℝ) | |
9 | simp1 1054 | . . . . . . . . . 10 ⊢ ((𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ∧ 𝑥 < 𝑦) → 𝑥 ∈ ℝ) | |
10 | 8, 9 | resubcld 10337 | . . . . . . . . 9 ⊢ ((𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ∧ 𝑥 < 𝑦) → (𝑦 − 𝑥) ∈ ℝ) |
11 | posdif 10400 | . . . . . . . . . 10 ⊢ ((𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ) → (𝑥 < 𝑦 ↔ 0 < (𝑦 − 𝑥))) | |
12 | 11 | biimp3a 1424 | . . . . . . . . 9 ⊢ ((𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ∧ 𝑥 < 𝑦) → 0 < (𝑦 − 𝑥)) |
13 | 10, 12 | elrpd 11745 | . . . . . . . 8 ⊢ ((𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ∧ 𝑥 < 𝑦) → (𝑦 − 𝑥) ∈ ℝ+) |
14 | efgt1 14685 | . . . . . . . 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 14657 | . . . . . . . 8 ⊢ ((𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ∧ 𝑥 < 𝑦) → (exp‘𝑥) ∈ ℝ) |
17 | 10 | reefcld 14657 | . . . . . . . 8 ⊢ ((𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ∧ 𝑥 < 𝑦) → (exp‘(𝑦 − 𝑥)) ∈ ℝ) |
18 | efgt0 14672 | . . . . . . . . 9 ⊢ (𝑥 ∈ ℝ → 0 < (exp‘𝑥)) | |
19 | 9, 18 | syl 17 | . . . . . . . 8 ⊢ ((𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ∧ 𝑥 < 𝑦) → 0 < (exp‘𝑥)) |
20 | ltmulgt11 10762 | . . . . . . . 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 1318 | . . . . . . 7 ⊢ ((𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ∧ 𝑥 < 𝑦) → (1 < (exp‘(𝑦 − 𝑥)) ↔ (exp‘𝑥) < ((exp‘𝑥) · (exp‘(𝑦 − 𝑥))))) |
22 | 15, 21 | mpbid 221 | . . . . . 6 ⊢ ((𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ∧ 𝑥 < 𝑦) → (exp‘𝑥) < ((exp‘𝑥) · (exp‘(𝑦 − 𝑥)))) |
23 | 9 | recnd 9947 | . . . . . . . 8 ⊢ ((𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ∧ 𝑥 < 𝑦) → 𝑥 ∈ ℂ) |
24 | 10 | recnd 9947 | . . . . . . . 8 ⊢ ((𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ∧ 𝑥 < 𝑦) → (𝑦 − 𝑥) ∈ ℂ) |
25 | efadd 14663 | . . . . . . . 8 ⊢ ((𝑥 ∈ ℂ ∧ (𝑦 − 𝑥) ∈ ℂ) → (exp‘(𝑥 + (𝑦 − 𝑥))) = ((exp‘𝑥) · (exp‘(𝑦 − 𝑥)))) | |
26 | 23, 24, 25 | syl2anc 691 | . . . . . . 7 ⊢ ((𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ∧ 𝑥 < 𝑦) → (exp‘(𝑥 + (𝑦 − 𝑥))) = ((exp‘𝑥) · (exp‘(𝑦 − 𝑥)))) |
27 | 8 | recnd 9947 | . . . . . . . . 9 ⊢ ((𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ∧ 𝑥 < 𝑦) → 𝑦 ∈ ℂ) |
28 | 23, 27 | pncan3d 10274 | . . . . . . . 8 ⊢ ((𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ∧ 𝑥 < 𝑦) → (𝑥 + (𝑦 − 𝑥)) = 𝑦) |
29 | 28 | fveq2d 6107 | . . . . . . 7 ⊢ ((𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ∧ 𝑥 < 𝑦) → (exp‘(𝑥 + (𝑦 − 𝑥))) = (exp‘𝑦)) |
30 | 26, 29 | eqtr3d 2646 | . . . . . 6 ⊢ ((𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ∧ 𝑥 < 𝑦) → ((exp‘𝑥) · (exp‘(𝑦 − 𝑥))) = (exp‘𝑦)) |
31 | 22, 30 | breqtrd 4609 | . . . . 5 ⊢ ((𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ∧ 𝑥 < 𝑦) → (exp‘𝑥) < (exp‘𝑦)) |
32 | 31 | 3expia 1259 | . . . 4 ⊢ ((𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ) → (𝑥 < 𝑦 → (exp‘𝑥) < (exp‘𝑦))) |
33 | 32 | adantl 481 | . . 3 ⊢ ((⊤ ∧ (𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ)) → (𝑥 < 𝑦 → (exp‘𝑥) < (exp‘𝑦))) |
34 | 2, 3, 4, 5, 7, 33 | ltord1 10433 | . 2 ⊢ ((⊤ ∧ (𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ)) → (𝐴 < 𝐵 ↔ (exp‘𝐴) < (exp‘𝐵))) |
35 | 1, 34 | mpan 702 | 1 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝐴 < 𝐵 ↔ (exp‘𝐴) < (exp‘𝐵))) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 195 ∧ wa 383 ∧ w3a 1031 = wceq 1475 ⊤wtru 1476 ∈ wcel 1977 class class class wbr 4583 ‘cfv 5804 (class class class)co 6549 ℂcc 9813 ℝcr 9814 0cc0 9815 1c1 9816 + caddc 9818 · cmul 9820 < clt 9953 − cmin 10145 ℝ+crp 11708 expce 14631 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1713 ax-4 1728 ax-5 1827 ax-6 1875 ax-7 1922 ax-8 1979 ax-9 1986 ax-10 2006 ax-11 2021 ax-12 2034 ax-13 2234 ax-ext 2590 ax-rep 4699 ax-sep 4709 ax-nul 4717 ax-pow 4769 ax-pr 4833 ax-un 6847 ax-inf2 8421 ax-cnex 9871 ax-resscn 9872 ax-1cn 9873 ax-icn 9874 ax-addcl 9875 ax-addrcl 9876 ax-mulcl 9877 ax-mulrcl 9878 ax-mulcom 9879 ax-addass 9880 ax-mulass 9881 ax-distr 9882 ax-i2m1 9883 ax-1ne0 9884 ax-1rid 9885 ax-rnegex 9886 ax-rrecex 9887 ax-cnre 9888 ax-pre-lttri 9889 ax-pre-lttrn 9890 ax-pre-ltadd 9891 ax-pre-mulgt0 9892 ax-pre-sup 9893 ax-addf 9894 ax-mulf 9895 |
This theorem depends on definitions: df-bi 196 df-or 384 df-an 385 df-3or 1032 df-3an 1033 df-tru 1478 df-fal 1481 df-ex 1696 df-nf 1701 df-sb 1868 df-eu 2462 df-mo 2463 df-clab 2597 df-cleq 2603 df-clel 2606 df-nfc 2740 df-ne 2782 df-nel 2783 df-ral 2901 df-rex 2902 df-reu 2903 df-rmo 2904 df-rab 2905 df-v 3175 df-sbc 3403 df-csb 3500 df-dif 3543 df-un 3545 df-in 3547 df-ss 3554 df-pss 3556 df-nul 3875 df-if 4037 df-pw 4110 df-sn 4126 df-pr 4128 df-tp 4130 df-op 4132 df-uni 4373 df-int 4411 df-iun 4457 df-br 4584 df-opab 4644 df-mpt 4645 df-tr 4681 df-eprel 4949 df-id 4953 df-po 4959 df-so 4960 df-fr 4997 df-se 4998 df-we 4999 df-xp 5044 df-rel 5045 df-cnv 5046 df-co 5047 df-dm 5048 df-rn 5049 df-res 5050 df-ima 5051 df-pred 5597 df-ord 5643 df-on 5644 df-lim 5645 df-suc 5646 df-iota 5768 df-fun 5806 df-fn 5807 df-f 5808 df-f1 5809 df-fo 5810 df-f1o 5811 df-fv 5812 df-isom 5813 df-riota 6511 df-ov 6552 df-oprab 6553 df-mpt2 6554 df-om 6958 df-1st 7059 df-2nd 7060 df-wrecs 7294 df-recs 7355 df-rdg 7393 df-1o 7447 df-oadd 7451 df-er 7629 df-pm 7747 df-en 7842 df-dom 7843 df-sdom 7844 df-fin 7845 df-sup 8231 df-inf 8232 df-oi 8298 df-card 8648 df-pnf 9955 df-mnf 9956 df-xr 9957 df-ltxr 9958 df-le 9959 df-sub 10147 df-neg 10148 df-div 10564 df-nn 10898 df-2 10956 df-3 10957 df-n0 11170 df-z 11255 df-uz 11564 df-rp 11709 df-ico 12052 df-fz 12198 df-fzo 12335 df-fl 12455 df-seq 12664 df-exp 12723 df-fac 12923 df-bc 12952 df-hash 12980 df-shft 13655 df-cj 13687 df-re 13688 df-im 13689 df-sqrt 13823 df-abs 13824 df-limsup 14050 df-clim 14067 df-rlim 14068 df-sum 14265 df-ef 14637 |
This theorem is referenced by: efle 14687 reefiso 24006 logdivlti 24170 divlogrlim 24181 cxplt 24240 birthday 24481 cxploglim 24504 emgt0 24533 bposlem6 24814 bposlem9 24817 pntpbnd1a 25074 pntibndlem2 25080 pntlemb 25086 ostth2lem3 25124 ostth2 25126 |
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