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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 12678 | . . . . . 6 ⊢ (𝑥 ∈ ℝ+ → 𝑥 ∈ (ℂ ∖ {0})) | |
2 | 1 | adantl 481 | . . . . 5 ⊢ (((𝐵 ∈ ℝ+ ∧ 1 < 𝐵) ∧ 𝑥 ∈ ℝ+) → 𝑥 ∈ (ℂ ∖ {0})) |
3 | rpcn 12669 | . . . . . . . . . . 11 ⊢ (𝐵 ∈ ℝ+ → 𝐵 ∈ ℂ) | |
4 | 3 | adantr 480 | . . . . . . . . . 10 ⊢ ((𝐵 ∈ ℝ+ ∧ 1 < 𝐵) → 𝐵 ∈ ℂ) |
5 | rpne0 12675 | . . . . . . . . . . 11 ⊢ (𝐵 ∈ ℝ+ → 𝐵 ≠ 0) | |
6 | 5 | adantr 480 | . . . . . . . . . 10 ⊢ ((𝐵 ∈ ℝ+ ∧ 1 < 𝐵) → 𝐵 ≠ 0) |
7 | animorr 975 | . . . . . . . . . . 11 ⊢ ((𝐵 ∈ ℝ+ ∧ 1 < 𝐵) → (𝐵 < 1 ∨ 1 < 𝐵)) | |
8 | rpre 12667 | . . . . . . . . . . . 12 ⊢ (𝐵 ∈ ℝ+ → 𝐵 ∈ ℝ) | |
9 | 1red 10907 | . . . . . . . . . . . 12 ⊢ (1 < 𝐵 → 1 ∈ ℝ) | |
10 | lttri2 10988 | . . . . . . . . . . . 12 ⊢ ((𝐵 ∈ ℝ ∧ 1 ∈ ℝ) → (𝐵 ≠ 1 ↔ (𝐵 < 1 ∨ 1 < 𝐵))) | |
11 | 8, 9, 10 | syl2an 595 | . . . . . . . . . . 11 ⊢ ((𝐵 ∈ ℝ+ ∧ 1 < 𝐵) → (𝐵 ≠ 1 ↔ (𝐵 < 1 ∨ 1 < 𝐵))) |
12 | 7, 11 | mpbird 256 | . . . . . . . . . 10 ⊢ ((𝐵 ∈ ℝ+ ∧ 1 < 𝐵) → 𝐵 ≠ 1) |
13 | 4, 6, 12 | 3jca 1126 | . . . . . . . . 9 ⊢ ((𝐵 ∈ ℝ+ ∧ 1 < 𝐵) → (𝐵 ∈ ℂ ∧ 𝐵 ≠ 0 ∧ 𝐵 ≠ 1)) |
14 | logbmpt 25843 | . . . . . . . . 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 5803 | . . . . . . 7 ⊢ ((𝐵 ∈ ℝ+ ∧ 1 < 𝐵) → dom (curry logb ‘𝐵) = dom (𝑥 ∈ (ℂ ∖ {0}) ↦ ((log‘𝑥) / (log‘𝐵)))) |
17 | ovexd 7290 | . . . . . . . . 9 ⊢ (((𝐵 ∈ ℝ+ ∧ 1 < 𝐵) ∧ 𝑥 ∈ (ℂ ∖ {0})) → ((log‘𝑥) / (log‘𝐵)) ∈ V) | |
18 | 17 | ralrimiva 3107 | . . . . . . . 8 ⊢ ((𝐵 ∈ ℝ+ ∧ 1 < 𝐵) → ∀𝑥 ∈ (ℂ ∖ {0})((log‘𝑥) / (log‘𝐵)) ∈ V) |
19 | dmmptg 6134 | . . . . . . . 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 2778 | . . . . . 6 ⊢ ((𝐵 ∈ ℝ+ ∧ 1 < 𝐵) → dom (curry logb ‘𝐵) = (ℂ ∖ {0})) |
22 | 21 | adantr 480 | . . . . 5 ⊢ (((𝐵 ∈ ℝ+ ∧ 1 < 𝐵) ∧ 𝑥 ∈ ℝ+) → dom (curry logb ‘𝐵) = (ℂ ∖ {0})) |
23 | 2, 22 | eleqtrrd 2842 | . . . 4 ⊢ (((𝐵 ∈ ℝ+ ∧ 1 < 𝐵) ∧ 𝑥 ∈ ℝ+) → 𝑥 ∈ dom (curry logb ‘𝐵)) |
24 | logbfval 25845 | . . . . . 6 ⊢ (((𝐵 ∈ ℂ ∧ 𝐵 ≠ 0 ∧ 𝐵 ≠ 1) ∧ 𝑥 ∈ (ℂ ∖ {0})) → ((curry logb ‘𝐵)‘𝑥) = (𝐵 logb 𝑥)) | |
25 | 13, 1, 24 | syl2an 595 | . . . . 5 ⊢ (((𝐵 ∈ ℝ+ ∧ 1 < 𝐵) ∧ 𝑥 ∈ ℝ+) → ((curry logb ‘𝐵)‘𝑥) = (𝐵 logb 𝑥)) |
26 | simpll 763 | . . . . . . 7 ⊢ (((𝐵 ∈ ℝ+ ∧ 1 < 𝐵) ∧ 𝑥 ∈ ℝ+) → 𝐵 ∈ ℝ+) | |
27 | simpr 484 | . . . . . . 7 ⊢ (((𝐵 ∈ ℝ+ ∧ 1 < 𝐵) ∧ 𝑥 ∈ ℝ+) → 𝑥 ∈ ℝ+) | |
28 | 12 | adantr 480 | . . . . . . 7 ⊢ (((𝐵 ∈ ℝ+ ∧ 1 < 𝐵) ∧ 𝑥 ∈ ℝ+) → 𝐵 ≠ 1) |
29 | 26, 27, 28 | 3jca 1126 | . . . . . 6 ⊢ (((𝐵 ∈ ℝ+ ∧ 1 < 𝐵) ∧ 𝑥 ∈ ℝ+) → (𝐵 ∈ ℝ+ ∧ 𝑥 ∈ ℝ+ ∧ 𝐵 ≠ 1)) |
30 | relogbcl 25828 | . . . . . 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 2839 | . . . 4 ⊢ (((𝐵 ∈ ℝ+ ∧ 1 < 𝐵) ∧ 𝑥 ∈ ℝ+) → ((curry logb ‘𝐵)‘𝑥) ∈ ℝ) |
33 | 23, 32 | jca 511 | . . 3 ⊢ (((𝐵 ∈ ℝ+ ∧ 1 < 𝐵) ∧ 𝑥 ∈ ℝ+) → (𝑥 ∈ dom (curry logb ‘𝐵) ∧ ((curry logb ‘𝐵)‘𝑥) ∈ ℝ)) |
34 | 33 | ralrimiva 3107 | . 2 ⊢ ((𝐵 ∈ ℝ+ ∧ 1 < 𝐵) → ∀𝑥 ∈ ℝ+ (𝑥 ∈ dom (curry logb ‘𝐵) ∧ ((curry logb ‘𝐵)‘𝑥) ∈ ℝ)) |
35 | logbf 25844 | . . . 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 6587 | . . 3 ⊢ ((curry logb ‘𝐵):(ℂ ∖ {0})⟶ℂ → Fun (curry logb ‘𝐵)) | |
38 | ffvresb 6980 | . . 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 256 | 1 ⊢ ((𝐵 ∈ ℝ+ ∧ 1 < 𝐵) → ((curry logb ‘𝐵) ↾ ℝ+):ℝ+⟶ℝ) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 205 ∧ wa 395 ∨ wo 843 ∧ w3a 1085 = wceq 1539 ∈ wcel 2108 ≠ wne 2942 ∀wral 3063 Vcvv 3422 ∖ cdif 3880 {csn 4558 class class class wbr 5070 ↦ cmpt 5153 dom cdm 5580 ↾ cres 5582 Fun wfun 6412 ⟶wf 6414 ‘cfv 6418 (class class class)co 7255 curry ccur 8052 ℂcc 10800 ℝcr 10801 0cc0 10802 1c1 10803 < clt 10940 / cdiv 11562 ℝ+crp 12659 logclog 25615 logb clogb 25819 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1799 ax-4 1813 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2110 ax-9 2118 ax-10 2139 ax-11 2156 ax-12 2173 ax-ext 2709 ax-rep 5205 ax-sep 5218 ax-nul 5225 ax-pow 5283 ax-pr 5347 ax-un 7566 ax-inf2 9329 ax-cnex 10858 ax-resscn 10859 ax-1cn 10860 ax-icn 10861 ax-addcl 10862 ax-addrcl 10863 ax-mulcl 10864 ax-mulrcl 10865 ax-mulcom 10866 ax-addass 10867 ax-mulass 10868 ax-distr 10869 ax-i2m1 10870 ax-1ne0 10871 ax-1rid 10872 ax-rnegex 10873 ax-rrecex 10874 ax-cnre 10875 ax-pre-lttri 10876 ax-pre-lttrn 10877 ax-pre-ltadd 10878 ax-pre-mulgt0 10879 ax-pre-sup 10880 ax-addf 10881 ax-mulf 10882 |
This theorem depends on definitions: df-bi 206 df-an 396 df-or 844 df-3or 1086 df-3an 1087 df-tru 1542 df-fal 1552 df-ex 1784 df-nf 1788 df-sb 2069 df-mo 2540 df-eu 2569 df-clab 2716 df-cleq 2730 df-clel 2817 df-nfc 2888 df-ne 2943 df-nel 3049 df-ral 3068 df-rex 3069 df-reu 3070 df-rmo 3071 df-rab 3072 df-v 3424 df-sbc 3712 df-csb 3829 df-dif 3886 df-un 3888 df-in 3890 df-ss 3900 df-pss 3902 df-nul 4254 df-if 4457 df-pw 4532 df-sn 4559 df-pr 4561 df-tp 4563 df-op 4565 df-uni 4837 df-int 4877 df-iun 4923 df-iin 4924 df-br 5071 df-opab 5133 df-mpt 5154 df-tr 5188 df-id 5480 df-eprel 5486 df-po 5494 df-so 5495 df-fr 5535 df-se 5536 df-we 5537 df-xp 5586 df-rel 5587 df-cnv 5588 df-co 5589 df-dm 5590 df-rn 5591 df-res 5592 df-ima 5593 df-pred 6191 df-ord 6254 df-on 6255 df-lim 6256 df-suc 6257 df-iota 6376 df-fun 6420 df-fn 6421 df-f 6422 df-f1 6423 df-fo 6424 df-f1o 6425 df-fv 6426 df-isom 6427 df-riota 7212 df-ov 7258 df-oprab 7259 df-mpo 7260 df-of 7511 df-om 7688 df-1st 7804 df-2nd 7805 df-supp 7949 df-cur 8054 df-frecs 8068 df-wrecs 8099 df-recs 8173 df-rdg 8212 df-1o 8267 df-2o 8268 df-er 8456 df-map 8575 df-pm 8576 df-ixp 8644 df-en 8692 df-dom 8693 df-sdom 8694 df-fin 8695 df-fsupp 9059 df-fi 9100 df-sup 9131 df-inf 9132 df-oi 9199 df-card 9628 df-pnf 10942 df-mnf 10943 df-xr 10944 df-ltxr 10945 df-le 10946 df-sub 11137 df-neg 11138 df-div 11563 df-nn 11904 df-2 11966 df-3 11967 df-4 11968 df-5 11969 df-6 11970 df-7 11971 df-8 11972 df-9 11973 df-n0 12164 df-z 12250 df-dec 12367 df-uz 12512 df-q 12618 df-rp 12660 df-xneg 12777 df-xadd 12778 df-xmul 12779 df-ioo 13012 df-ioc 13013 df-ico 13014 df-icc 13015 df-fz 13169 df-fzo 13312 df-fl 13440 df-mod 13518 df-seq 13650 df-exp 13711 df-fac 13916 df-bc 13945 df-hash 13973 df-shft 14706 df-cj 14738 df-re 14739 df-im 14740 df-sqrt 14874 df-abs 14875 df-limsup 15108 df-clim 15125 df-rlim 15126 df-sum 15326 df-ef 15705 df-sin 15707 df-cos 15708 df-pi 15710 df-struct 16776 df-sets 16793 df-slot 16811 df-ndx 16823 df-base 16841 df-ress 16868 df-plusg 16901 df-mulr 16902 df-starv 16903 df-sca 16904 df-vsca 16905 df-ip 16906 df-tset 16907 df-ple 16908 df-ds 16910 df-unif 16911 df-hom 16912 df-cco 16913 df-rest 17050 df-topn 17051 df-0g 17069 df-gsum 17070 df-topgen 17071 df-pt 17072 df-prds 17075 df-xrs 17130 df-qtop 17135 df-imas 17136 df-xps 17138 df-mre 17212 df-mrc 17213 df-acs 17215 df-mgm 18241 df-sgrp 18290 df-mnd 18301 df-submnd 18346 df-mulg 18616 df-cntz 18838 df-cmn 19303 df-psmet 20502 df-xmet 20503 df-met 20504 df-bl 20505 df-mopn 20506 df-fbas 20507 df-fg 20508 df-cnfld 20511 df-top 21951 df-topon 21968 df-topsp 21990 df-bases 22004 df-cld 22078 df-ntr 22079 df-cls 22080 df-nei 22157 df-lp 22195 df-perf 22196 df-cn 22286 df-cnp 22287 df-haus 22374 df-tx 22621 df-hmeo 22814 df-fil 22905 df-fm 22997 df-flim 22998 df-flf 22999 df-xms 23381 df-ms 23382 df-tms 23383 df-cncf 23947 df-limc 24935 df-dv 24936 df-log 25617 df-logb 25820 |
This theorem is referenced by: (None) |
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