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Mirrors > Home > MPE Home > Th. List > 2logb9irrALT | Structured version Visualization version GIF version |
Description: Alternate proof of 2logb9irr 25945: The logarithm of nine to base two is irrational. (Contributed by AV, 31-Dec-2022.) (Proof modification is discouraged.) (New usage is discouraged.) |
Ref | Expression |
---|---|
2logb9irrALT | ⊢ (2 logb 9) ∈ (ℝ ∖ ℚ) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | sq3 13915 | . . . . 5 ⊢ (3↑2) = 9 | |
2 | 1 | eqcomi 2747 | . . . 4 ⊢ 9 = (3↑2) |
3 | 2 | oveq2i 7286 | . . 3 ⊢ (2 logb 9) = (2 logb (3↑2)) |
4 | 2cn 12048 | . . . . 5 ⊢ 2 ∈ ℂ | |
5 | 2ne0 12077 | . . . . 5 ⊢ 2 ≠ 0 | |
6 | 1ne2 12181 | . . . . . 6 ⊢ 1 ≠ 2 | |
7 | 6 | necomi 2998 | . . . . 5 ⊢ 2 ≠ 1 |
8 | eldifpr 4593 | . . . . 5 ⊢ (2 ∈ (ℂ ∖ {0, 1}) ↔ (2 ∈ ℂ ∧ 2 ≠ 0 ∧ 2 ≠ 1)) | |
9 | 4, 5, 7, 8 | mpbir3an 1340 | . . . 4 ⊢ 2 ∈ (ℂ ∖ {0, 1}) |
10 | 3rp 12736 | . . . 4 ⊢ 3 ∈ ℝ+ | |
11 | 2z 12352 | . . . 4 ⊢ 2 ∈ ℤ | |
12 | relogbzexp 25926 | . . . 4 ⊢ ((2 ∈ (ℂ ∖ {0, 1}) ∧ 3 ∈ ℝ+ ∧ 2 ∈ ℤ) → (2 logb (3↑2)) = (2 · (2 logb 3))) | |
13 | 9, 10, 11, 12 | mp3an 1460 | . . 3 ⊢ (2 logb (3↑2)) = (2 · (2 logb 3)) |
14 | 3, 13 | eqtri 2766 | . 2 ⊢ (2 logb 9) = (2 · (2 logb 3)) |
15 | 3cn 12054 | . . . . . 6 ⊢ 3 ∈ ℂ | |
16 | 3ne0 12079 | . . . . . 6 ⊢ 3 ≠ 0 | |
17 | eldifsn 4720 | . . . . . 6 ⊢ (3 ∈ (ℂ ∖ {0}) ↔ (3 ∈ ℂ ∧ 3 ≠ 0)) | |
18 | 15, 16, 17 | mpbir2an 708 | . . . . 5 ⊢ 3 ∈ (ℂ ∖ {0}) |
19 | logbcl 25917 | . . . . 5 ⊢ ((2 ∈ (ℂ ∖ {0, 1}) ∧ 3 ∈ (ℂ ∖ {0})) → (2 logb 3) ∈ ℂ) | |
20 | 9, 18, 19 | mp2an 689 | . . . 4 ⊢ (2 logb 3) ∈ ℂ |
21 | 4, 20 | mulcomi 10983 | . . 3 ⊢ (2 · (2 logb 3)) = ((2 logb 3) · 2) |
22 | 2logb3irr 25947 | . . . 4 ⊢ (2 logb 3) ∈ (ℝ ∖ ℚ) | |
23 | zq 12694 | . . . . 5 ⊢ (2 ∈ ℤ → 2 ∈ ℚ) | |
24 | 11, 23 | ax-mp 5 | . . . 4 ⊢ 2 ∈ ℚ |
25 | irrmul 12714 | . . . 4 ⊢ (((2 logb 3) ∈ (ℝ ∖ ℚ) ∧ 2 ∈ ℚ ∧ 2 ≠ 0) → ((2 logb 3) · 2) ∈ (ℝ ∖ ℚ)) | |
26 | 22, 24, 5, 25 | mp3an 1460 | . . 3 ⊢ ((2 logb 3) · 2) ∈ (ℝ ∖ ℚ) |
27 | 21, 26 | eqeltri 2835 | . 2 ⊢ (2 · (2 logb 3)) ∈ (ℝ ∖ ℚ) |
28 | 14, 27 | eqeltri 2835 | 1 ⊢ (2 logb 9) ∈ (ℝ ∖ ℚ) |
Colors of variables: wff setvar class |
Syntax hints: = wceq 1539 ∈ wcel 2106 ≠ wne 2943 ∖ cdif 3884 {csn 4561 {cpr 4563 (class class class)co 7275 ℂcc 10869 ℝcr 10870 0cc0 10871 1c1 10872 · cmul 10876 2c2 12028 3c3 12029 9c9 12035 ℤcz 12319 ℚcq 12688 ℝ+crp 12730 ↑cexp 13782 logb clogb 25914 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 ax-5 1913 ax-6 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-10 2137 ax-11 2154 ax-12 2171 ax-ext 2709 ax-rep 5209 ax-sep 5223 ax-nul 5230 ax-pow 5288 ax-pr 5352 ax-un 7588 ax-inf2 9399 ax-cnex 10927 ax-resscn 10928 ax-1cn 10929 ax-icn 10930 ax-addcl 10931 ax-addrcl 10932 ax-mulcl 10933 ax-mulrcl 10934 ax-mulcom 10935 ax-addass 10936 ax-mulass 10937 ax-distr 10938 ax-i2m1 10939 ax-1ne0 10940 ax-1rid 10941 ax-rnegex 10942 ax-rrecex 10943 ax-cnre 10944 ax-pre-lttri 10945 ax-pre-lttrn 10946 ax-pre-ltadd 10947 ax-pre-mulgt0 10948 ax-pre-sup 10949 ax-addf 10950 ax-mulf 10951 |
This theorem depends on definitions: df-bi 206 df-an 397 df-or 845 df-3or 1087 df-3an 1088 df-tru 1542 df-fal 1552 df-ex 1783 df-nf 1787 df-sb 2068 df-mo 2540 df-eu 2569 df-clab 2716 df-cleq 2730 df-clel 2816 df-nfc 2889 df-ne 2944 df-nel 3050 df-ral 3069 df-rex 3070 df-rmo 3071 df-reu 3072 df-rab 3073 df-v 3434 df-sbc 3717 df-csb 3833 df-dif 3890 df-un 3892 df-in 3894 df-ss 3904 df-pss 3906 df-nul 4257 df-if 4460 df-pw 4535 df-sn 4562 df-pr 4564 df-tp 4566 df-op 4568 df-uni 4840 df-int 4880 df-iun 4926 df-iin 4927 df-br 5075 df-opab 5137 df-mpt 5158 df-tr 5192 df-id 5489 df-eprel 5495 df-po 5503 df-so 5504 df-fr 5544 df-se 5545 df-we 5546 df-xp 5595 df-rel 5596 df-cnv 5597 df-co 5598 df-dm 5599 df-rn 5600 df-res 5601 df-ima 5602 df-pred 6202 df-ord 6269 df-on 6270 df-lim 6271 df-suc 6272 df-iota 6391 df-fun 6435 df-fn 6436 df-f 6437 df-f1 6438 df-fo 6439 df-f1o 6440 df-fv 6441 df-isom 6442 df-riota 7232 df-ov 7278 df-oprab 7279 df-mpo 7280 df-of 7533 df-om 7713 df-1st 7831 df-2nd 7832 df-supp 7978 df-frecs 8097 df-wrecs 8128 df-recs 8202 df-rdg 8241 df-1o 8297 df-2o 8298 df-er 8498 df-map 8617 df-pm 8618 df-ixp 8686 df-en 8734 df-dom 8735 df-sdom 8736 df-fin 8737 df-fsupp 9129 df-fi 9170 df-sup 9201 df-inf 9202 df-oi 9269 df-card 9697 df-pnf 11011 df-mnf 11012 df-xr 11013 df-ltxr 11014 df-le 11015 df-sub 11207 df-neg 11208 df-div 11633 df-nn 11974 df-2 12036 df-3 12037 df-4 12038 df-5 12039 df-6 12040 df-7 12041 df-8 12042 df-9 12043 df-n0 12234 df-z 12320 df-dec 12438 df-uz 12583 df-q 12689 df-rp 12731 df-xneg 12848 df-xadd 12849 df-xmul 12850 df-ioo 13083 df-ioc 13084 df-ico 13085 df-icc 13086 df-fz 13240 df-fzo 13383 df-fl 13512 df-mod 13590 df-seq 13722 df-exp 13783 df-fac 13988 df-bc 14017 df-hash 14045 df-shft 14778 df-cj 14810 df-re 14811 df-im 14812 df-sqrt 14946 df-abs 14947 df-limsup 15180 df-clim 15197 df-rlim 15198 df-sum 15398 df-ef 15777 df-sin 15779 df-cos 15780 df-pi 15782 df-dvds 15964 df-gcd 16202 df-prm 16377 df-struct 16848 df-sets 16865 df-slot 16883 df-ndx 16895 df-base 16913 df-ress 16942 df-plusg 16975 df-mulr 16976 df-starv 16977 df-sca 16978 df-vsca 16979 df-ip 16980 df-tset 16981 df-ple 16982 df-ds 16984 df-unif 16985 df-hom 16986 df-cco 16987 df-rest 17133 df-topn 17134 df-0g 17152 df-gsum 17153 df-topgen 17154 df-pt 17155 df-prds 17158 df-xrs 17213 df-qtop 17218 df-imas 17219 df-xps 17221 df-mre 17295 df-mrc 17296 df-acs 17298 df-mgm 18326 df-sgrp 18375 df-mnd 18386 df-submnd 18431 df-mulg 18701 df-cntz 18923 df-cmn 19388 df-psmet 20589 df-xmet 20590 df-met 20591 df-bl 20592 df-mopn 20593 df-fbas 20594 df-fg 20595 df-cnfld 20598 df-top 22043 df-topon 22060 df-topsp 22082 df-bases 22096 df-cld 22170 df-ntr 22171 df-cls 22172 df-nei 22249 df-lp 22287 df-perf 22288 df-cn 22378 df-cnp 22379 df-haus 22466 df-tx 22713 df-hmeo 22906 df-fil 22997 df-fm 23089 df-flim 23090 df-flf 23091 df-xms 23473 df-ms 23474 df-tms 23475 df-cncf 24041 df-limc 25030 df-dv 25031 df-log 25712 df-cxp 25713 df-logb 25915 |
This theorem is referenced by: (None) |
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