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Mirrors > Home > MPE Home > Th. List > relogbf | Structured version Visualization version GIF version |
Description: The general logarithm to a real base greater than 1 regarded as function restricted to the positive integers. Property in [Cohen4] p. 349. (Contributed by AV, 12-Jun-2020.) |
Ref | Expression |
---|---|
relogbf | ⊢ ((𝐵 ∈ ℝ+ ∧ 1 < 𝐵) → ((curry logb ‘𝐵) ↾ ℝ+):ℝ+⟶ℝ) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | rpcndif0 12492 | . . . . . 6 ⊢ (𝑥 ∈ ℝ+ → 𝑥 ∈ (ℂ ∖ {0})) | |
2 | 1 | adantl 485 | . . . . 5 ⊢ (((𝐵 ∈ ℝ+ ∧ 1 < 𝐵) ∧ 𝑥 ∈ ℝ+) → 𝑥 ∈ (ℂ ∖ {0})) |
3 | rpcn 12483 | . . . . . . . . . . 11 ⊢ (𝐵 ∈ ℝ+ → 𝐵 ∈ ℂ) | |
4 | 3 | adantr 484 | . . . . . . . . . 10 ⊢ ((𝐵 ∈ ℝ+ ∧ 1 < 𝐵) → 𝐵 ∈ ℂ) |
5 | rpne0 12489 | . . . . . . . . . . 11 ⊢ (𝐵 ∈ ℝ+ → 𝐵 ≠ 0) | |
6 | 5 | adantr 484 | . . . . . . . . . 10 ⊢ ((𝐵 ∈ ℝ+ ∧ 1 < 𝐵) → 𝐵 ≠ 0) |
7 | animorr 978 | . . . . . . . . . . 11 ⊢ ((𝐵 ∈ ℝ+ ∧ 1 < 𝐵) → (𝐵 < 1 ∨ 1 < 𝐵)) | |
8 | rpre 12481 | . . . . . . . . . . . 12 ⊢ (𝐵 ∈ ℝ+ → 𝐵 ∈ ℝ) | |
9 | 1red 10721 | . . . . . . . . . . . 12 ⊢ (1 < 𝐵 → 1 ∈ ℝ) | |
10 | lttri2 10802 | . . . . . . . . . . . 12 ⊢ ((𝐵 ∈ ℝ ∧ 1 ∈ ℝ) → (𝐵 ≠ 1 ↔ (𝐵 < 1 ∨ 1 < 𝐵))) | |
11 | 8, 9, 10 | syl2an 599 | . . . . . . . . . . 11 ⊢ ((𝐵 ∈ ℝ+ ∧ 1 < 𝐵) → (𝐵 ≠ 1 ↔ (𝐵 < 1 ∨ 1 < 𝐵))) |
12 | 7, 11 | mpbird 260 | . . . . . . . . . 10 ⊢ ((𝐵 ∈ ℝ+ ∧ 1 < 𝐵) → 𝐵 ≠ 1) |
13 | 4, 6, 12 | 3jca 1129 | . . . . . . . . 9 ⊢ ((𝐵 ∈ ℝ+ ∧ 1 < 𝐵) → (𝐵 ∈ ℂ ∧ 𝐵 ≠ 0 ∧ 𝐵 ≠ 1)) |
14 | logbmpt 25526 | . . . . . . . . 9 ⊢ ((𝐵 ∈ ℂ ∧ 𝐵 ≠ 0 ∧ 𝐵 ≠ 1) → (curry logb ‘𝐵) = (𝑥 ∈ (ℂ ∖ {0}) ↦ ((log‘𝑥) / (log‘𝐵)))) | |
15 | 13, 14 | syl 17 | . . . . . . . 8 ⊢ ((𝐵 ∈ ℝ+ ∧ 1 < 𝐵) → (curry logb ‘𝐵) = (𝑥 ∈ (ℂ ∖ {0}) ↦ ((log‘𝑥) / (log‘𝐵)))) |
16 | 15 | dmeqd 5749 | . . . . . . 7 ⊢ ((𝐵 ∈ ℝ+ ∧ 1 < 𝐵) → dom (curry logb ‘𝐵) = dom (𝑥 ∈ (ℂ ∖ {0}) ↦ ((log‘𝑥) / (log‘𝐵)))) |
17 | ovexd 7206 | . . . . . . . . 9 ⊢ (((𝐵 ∈ ℝ+ ∧ 1 < 𝐵) ∧ 𝑥 ∈ (ℂ ∖ {0})) → ((log‘𝑥) / (log‘𝐵)) ∈ V) | |
18 | 17 | ralrimiva 3096 | . . . . . . . 8 ⊢ ((𝐵 ∈ ℝ+ ∧ 1 < 𝐵) → ∀𝑥 ∈ (ℂ ∖ {0})((log‘𝑥) / (log‘𝐵)) ∈ V) |
19 | dmmptg 6075 | . . . . . . . 8 ⊢ (∀𝑥 ∈ (ℂ ∖ {0})((log‘𝑥) / (log‘𝐵)) ∈ V → dom (𝑥 ∈ (ℂ ∖ {0}) ↦ ((log‘𝑥) / (log‘𝐵))) = (ℂ ∖ {0})) | |
20 | 18, 19 | syl 17 | . . . . . . 7 ⊢ ((𝐵 ∈ ℝ+ ∧ 1 < 𝐵) → dom (𝑥 ∈ (ℂ ∖ {0}) ↦ ((log‘𝑥) / (log‘𝐵))) = (ℂ ∖ {0})) |
21 | 16, 20 | eqtrd 2773 | . . . . . 6 ⊢ ((𝐵 ∈ ℝ+ ∧ 1 < 𝐵) → dom (curry logb ‘𝐵) = (ℂ ∖ {0})) |
22 | 21 | adantr 484 | . . . . 5 ⊢ (((𝐵 ∈ ℝ+ ∧ 1 < 𝐵) ∧ 𝑥 ∈ ℝ+) → dom (curry logb ‘𝐵) = (ℂ ∖ {0})) |
23 | 2, 22 | eleqtrrd 2836 | . . . 4 ⊢ (((𝐵 ∈ ℝ+ ∧ 1 < 𝐵) ∧ 𝑥 ∈ ℝ+) → 𝑥 ∈ dom (curry logb ‘𝐵)) |
24 | logbfval 25528 | . . . . . 6 ⊢ (((𝐵 ∈ ℂ ∧ 𝐵 ≠ 0 ∧ 𝐵 ≠ 1) ∧ 𝑥 ∈ (ℂ ∖ {0})) → ((curry logb ‘𝐵)‘𝑥) = (𝐵 logb 𝑥)) | |
25 | 13, 1, 24 | syl2an 599 | . . . . 5 ⊢ (((𝐵 ∈ ℝ+ ∧ 1 < 𝐵) ∧ 𝑥 ∈ ℝ+) → ((curry logb ‘𝐵)‘𝑥) = (𝐵 logb 𝑥)) |
26 | simpll 767 | . . . . . . 7 ⊢ (((𝐵 ∈ ℝ+ ∧ 1 < 𝐵) ∧ 𝑥 ∈ ℝ+) → 𝐵 ∈ ℝ+) | |
27 | simpr 488 | . . . . . . 7 ⊢ (((𝐵 ∈ ℝ+ ∧ 1 < 𝐵) ∧ 𝑥 ∈ ℝ+) → 𝑥 ∈ ℝ+) | |
28 | 12 | adantr 484 | . . . . . . 7 ⊢ (((𝐵 ∈ ℝ+ ∧ 1 < 𝐵) ∧ 𝑥 ∈ ℝ+) → 𝐵 ≠ 1) |
29 | 26, 27, 28 | 3jca 1129 | . . . . . 6 ⊢ (((𝐵 ∈ ℝ+ ∧ 1 < 𝐵) ∧ 𝑥 ∈ ℝ+) → (𝐵 ∈ ℝ+ ∧ 𝑥 ∈ ℝ+ ∧ 𝐵 ≠ 1)) |
30 | relogbcl 25511 | . . . . . 6 ⊢ ((𝐵 ∈ ℝ+ ∧ 𝑥 ∈ ℝ+ ∧ 𝐵 ≠ 1) → (𝐵 logb 𝑥) ∈ ℝ) | |
31 | 29, 30 | syl 17 | . . . . 5 ⊢ (((𝐵 ∈ ℝ+ ∧ 1 < 𝐵) ∧ 𝑥 ∈ ℝ+) → (𝐵 logb 𝑥) ∈ ℝ) |
32 | 25, 31 | eqeltrd 2833 | . . . 4 ⊢ (((𝐵 ∈ ℝ+ ∧ 1 < 𝐵) ∧ 𝑥 ∈ ℝ+) → ((curry logb ‘𝐵)‘𝑥) ∈ ℝ) |
33 | 23, 32 | jca 515 | . . 3 ⊢ (((𝐵 ∈ ℝ+ ∧ 1 < 𝐵) ∧ 𝑥 ∈ ℝ+) → (𝑥 ∈ dom (curry logb ‘𝐵) ∧ ((curry logb ‘𝐵)‘𝑥) ∈ ℝ)) |
34 | 33 | ralrimiva 3096 | . 2 ⊢ ((𝐵 ∈ ℝ+ ∧ 1 < 𝐵) → ∀𝑥 ∈ ℝ+ (𝑥 ∈ dom (curry logb ‘𝐵) ∧ ((curry logb ‘𝐵)‘𝑥) ∈ ℝ)) |
35 | logbf 25527 | . . . 4 ⊢ ((𝐵 ∈ ℂ ∧ 𝐵 ≠ 0 ∧ 𝐵 ≠ 1) → (curry logb ‘𝐵):(ℂ ∖ {0})⟶ℂ) | |
36 | 13, 35 | syl 17 | . . 3 ⊢ ((𝐵 ∈ ℝ+ ∧ 1 < 𝐵) → (curry logb ‘𝐵):(ℂ ∖ {0})⟶ℂ) |
37 | ffun 6508 | . . 3 ⊢ ((curry logb ‘𝐵):(ℂ ∖ {0})⟶ℂ → Fun (curry logb ‘𝐵)) | |
38 | ffvresb 6899 | . . 3 ⊢ (Fun (curry logb ‘𝐵) → (((curry logb ‘𝐵) ↾ ℝ+):ℝ+⟶ℝ ↔ ∀𝑥 ∈ ℝ+ (𝑥 ∈ dom (curry logb ‘𝐵) ∧ ((curry logb ‘𝐵)‘𝑥) ∈ ℝ))) | |
39 | 36, 37, 38 | 3syl 18 | . 2 ⊢ ((𝐵 ∈ ℝ+ ∧ 1 < 𝐵) → (((curry logb ‘𝐵) ↾ ℝ+):ℝ+⟶ℝ ↔ ∀𝑥 ∈ ℝ+ (𝑥 ∈ dom (curry logb ‘𝐵) ∧ ((curry logb ‘𝐵)‘𝑥) ∈ ℝ))) |
40 | 34, 39 | mpbird 260 | 1 ⊢ ((𝐵 ∈ ℝ+ ∧ 1 < 𝐵) → ((curry logb ‘𝐵) ↾ ℝ+):ℝ+⟶ℝ) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 209 ∧ wa 399 ∨ wo 846 ∧ w3a 1088 = wceq 1542 ∈ wcel 2113 ≠ wne 2934 ∀wral 3053 Vcvv 3398 ∖ cdif 3841 {csn 4517 class class class wbr 5031 ↦ cmpt 5111 dom cdm 5526 ↾ cres 5528 Fun wfun 6334 ⟶wf 6336 ‘cfv 6340 (class class class)co 7171 curry ccur 7961 ℂcc 10614 ℝcr 10615 0cc0 10616 1c1 10617 < clt 10754 / cdiv 11376 ℝ+crp 12473 logclog 25298 logb clogb 25502 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1802 ax-4 1816 ax-5 1916 ax-6 1974 ax-7 2019 ax-8 2115 ax-9 2123 ax-10 2144 ax-11 2161 ax-12 2178 ax-ext 2710 ax-rep 5155 ax-sep 5168 ax-nul 5175 ax-pow 5233 ax-pr 5297 ax-un 7480 ax-inf2 9178 ax-cnex 10672 ax-resscn 10673 ax-1cn 10674 ax-icn 10675 ax-addcl 10676 ax-addrcl 10677 ax-mulcl 10678 ax-mulrcl 10679 ax-mulcom 10680 ax-addass 10681 ax-mulass 10682 ax-distr 10683 ax-i2m1 10684 ax-1ne0 10685 ax-1rid 10686 ax-rnegex 10687 ax-rrecex 10688 ax-cnre 10689 ax-pre-lttri 10690 ax-pre-lttrn 10691 ax-pre-ltadd 10692 ax-pre-mulgt0 10693 ax-pre-sup 10694 ax-addf 10695 ax-mulf 10696 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 847 df-3or 1089 df-3an 1090 df-tru 1545 df-fal 1555 df-ex 1787 df-nf 1791 df-sb 2074 df-mo 2540 df-eu 2570 df-clab 2717 df-cleq 2730 df-clel 2811 df-nfc 2881 df-ne 2935 df-nel 3039 df-ral 3058 df-rex 3059 df-reu 3060 df-rmo 3061 df-rab 3062 df-v 3400 df-sbc 3683 df-csb 3792 df-dif 3847 df-un 3849 df-in 3851 df-ss 3861 df-pss 3863 df-nul 4213 df-if 4416 df-pw 4491 df-sn 4518 df-pr 4520 df-tp 4522 df-op 4524 df-uni 4798 df-int 4838 df-iun 4884 df-iin 4885 df-br 5032 df-opab 5094 df-mpt 5112 df-tr 5138 df-id 5430 df-eprel 5435 df-po 5443 df-so 5444 df-fr 5484 df-se 5485 df-we 5486 df-xp 5532 df-rel 5533 df-cnv 5534 df-co 5535 df-dm 5536 df-rn 5537 df-res 5538 df-ima 5539 df-pred 6130 df-ord 6176 df-on 6177 df-lim 6178 df-suc 6179 df-iota 6298 df-fun 6342 df-fn 6343 df-f 6344 df-f1 6345 df-fo 6346 df-f1o 6347 df-fv 6348 df-isom 6349 df-riota 7128 df-ov 7174 df-oprab 7175 df-mpo 7176 df-of 7426 df-om 7601 df-1st 7715 df-2nd 7716 df-supp 7858 df-cur 7963 df-wrecs 7977 df-recs 8038 df-rdg 8076 df-1o 8132 df-2o 8133 df-er 8321 df-map 8440 df-pm 8441 df-ixp 8509 df-en 8557 df-dom 8558 df-sdom 8559 df-fin 8560 df-fsupp 8908 df-fi 8949 df-sup 8980 df-inf 8981 df-oi 9048 df-card 9442 df-pnf 10756 df-mnf 10757 df-xr 10758 df-ltxr 10759 df-le 10760 df-sub 10951 df-neg 10952 df-div 11377 df-nn 11718 df-2 11780 df-3 11781 df-4 11782 df-5 11783 df-6 11784 df-7 11785 df-8 11786 df-9 11787 df-n0 11978 df-z 12064 df-dec 12181 df-uz 12326 df-q 12432 df-rp 12474 df-xneg 12591 df-xadd 12592 df-xmul 12593 df-ioo 12826 df-ioc 12827 df-ico 12828 df-icc 12829 df-fz 12983 df-fzo 13126 df-fl 13254 df-mod 13330 df-seq 13462 df-exp 13523 df-fac 13727 df-bc 13756 df-hash 13784 df-shft 14517 df-cj 14549 df-re 14550 df-im 14551 df-sqrt 14685 df-abs 14686 df-limsup 14919 df-clim 14936 df-rlim 14937 df-sum 15137 df-ef 15514 df-sin 15516 df-cos 15517 df-pi 15519 df-struct 16589 df-ndx 16590 df-slot 16591 df-base 16593 df-sets 16594 df-ress 16595 df-plusg 16682 df-mulr 16683 df-starv 16684 df-sca 16685 df-vsca 16686 df-ip 16687 df-tset 16688 df-ple 16689 df-ds 16691 df-unif 16692 df-hom 16693 df-cco 16694 df-rest 16800 df-topn 16801 df-0g 16819 df-gsum 16820 df-topgen 16821 df-pt 16822 df-prds 16825 df-xrs 16879 df-qtop 16884 df-imas 16885 df-xps 16887 df-mre 16961 df-mrc 16962 df-acs 16964 df-mgm 17969 df-sgrp 18018 df-mnd 18029 df-submnd 18074 df-mulg 18344 df-cntz 18566 df-cmn 19027 df-psmet 20210 df-xmet 20211 df-met 20212 df-bl 20213 df-mopn 20214 df-fbas 20215 df-fg 20216 df-cnfld 20219 df-top 21646 df-topon 21663 df-topsp 21685 df-bases 21698 df-cld 21771 df-ntr 21772 df-cls 21773 df-nei 21850 df-lp 21888 df-perf 21889 df-cn 21979 df-cnp 21980 df-haus 22067 df-tx 22314 df-hmeo 22507 df-fil 22598 df-fm 22690 df-flim 22691 df-flf 22692 df-xms 23074 df-ms 23075 df-tms 23076 df-cncf 23631 df-limc 24618 df-dv 24619 df-log 25300 df-logb 25503 |
This theorem is referenced by: (None) |
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