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Mirrors > Home > ILE Home > Th. List > sqrt2cxp2logb9e3 | GIF version |
Description: The square root of two to the power of the logarithm of nine to base two is three. (√‘2) and (2 logb 9) are not rational (see sqrt2irr0 12199 resp. 2logb9irr 14866), satisfying the statement in 2irrexpq 14871. (Contributed by AV, 29-Dec-2022.) |
Ref | Expression |
---|---|
sqrt2cxp2logb9e3 | ⊢ ((√‘2)↑𝑐(2 logb 9)) = 3 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 2rp 9690 | . . . . . 6 ⊢ 2 ∈ ℝ+ | |
2 | rpcxpsqrt 14819 | . . . . . 6 ⊢ (2 ∈ ℝ+ → (2↑𝑐(1 / 2)) = (√‘2)) | |
3 | 1, 2 | ax-mp 5 | . . . . 5 ⊢ (2↑𝑐(1 / 2)) = (√‘2) |
4 | 3 | eqcomi 2193 | . . . 4 ⊢ (√‘2) = (2↑𝑐(1 / 2)) |
5 | 4 | oveq1i 5907 | . . 3 ⊢ ((√‘2)↑𝑐(2 logb 9)) = ((2↑𝑐(1 / 2))↑𝑐(2 logb 9)) |
6 | halfre 9163 | . . . 4 ⊢ (1 / 2) ∈ ℝ | |
7 | 2z 9312 | . . . . . 6 ⊢ 2 ∈ ℤ | |
8 | uzid 9573 | . . . . . 6 ⊢ (2 ∈ ℤ → 2 ∈ (ℤ≥‘2)) | |
9 | 7, 8 | ax-mp 5 | . . . . 5 ⊢ 2 ∈ (ℤ≥‘2) |
10 | 9nn 9118 | . . . . . 6 ⊢ 9 ∈ ℕ | |
11 | nnrp 9695 | . . . . . 6 ⊢ (9 ∈ ℕ → 9 ∈ ℝ+) | |
12 | 10, 11 | ax-mp 5 | . . . . 5 ⊢ 9 ∈ ℝ+ |
13 | relogbzcl 14847 | . . . . 5 ⊢ ((2 ∈ (ℤ≥‘2) ∧ 9 ∈ ℝ+) → (2 logb 9) ∈ ℝ) | |
14 | 9, 12, 13 | mp2an 426 | . . . 4 ⊢ (2 logb 9) ∈ ℝ |
15 | cxpcom 14834 | . . . 4 ⊢ ((2 ∈ ℝ+ ∧ (1 / 2) ∈ ℝ ∧ (2 logb 9) ∈ ℝ) → ((2↑𝑐(1 / 2))↑𝑐(2 logb 9)) = ((2↑𝑐(2 logb 9))↑𝑐(1 / 2))) | |
16 | 1, 6, 14, 15 | mp3an 1348 | . . 3 ⊢ ((2↑𝑐(1 / 2))↑𝑐(2 logb 9)) = ((2↑𝑐(2 logb 9))↑𝑐(1 / 2)) |
17 | rpcxpcl 14801 | . . . . 5 ⊢ ((2 ∈ ℝ+ ∧ (2 logb 9) ∈ ℝ) → (2↑𝑐(2 logb 9)) ∈ ℝ+) | |
18 | 1, 14, 17 | mp2an 426 | . . . 4 ⊢ (2↑𝑐(2 logb 9)) ∈ ℝ+ |
19 | rpcxpsqrt 14819 | . . . 4 ⊢ ((2↑𝑐(2 logb 9)) ∈ ℝ+ → ((2↑𝑐(2 logb 9))↑𝑐(1 / 2)) = (√‘(2↑𝑐(2 logb 9)))) | |
20 | 18, 19 | ax-mp 5 | . . 3 ⊢ ((2↑𝑐(2 logb 9))↑𝑐(1 / 2)) = (√‘(2↑𝑐(2 logb 9))) |
21 | 5, 16, 20 | 3eqtri 2214 | . 2 ⊢ ((√‘2)↑𝑐(2 logb 9)) = (√‘(2↑𝑐(2 logb 9))) |
22 | 1re 7987 | . . . . 5 ⊢ 1 ∈ ℝ | |
23 | 2re 9020 | . . . . 5 ⊢ 2 ∈ ℝ | |
24 | 1lt2 9119 | . . . . 5 ⊢ 1 < 2 | |
25 | 22, 23, 24 | gtapii 8622 | . . . 4 ⊢ 2 # 1 |
26 | rpcxplogb 14859 | . . . 4 ⊢ ((2 ∈ ℝ+ ∧ 2 # 1 ∧ 9 ∈ ℝ+) → (2↑𝑐(2 logb 9)) = 9) | |
27 | 1, 25, 12, 26 | mp3an 1348 | . . 3 ⊢ (2↑𝑐(2 logb 9)) = 9 |
28 | 27 | fveq2i 5537 | . 2 ⊢ (√‘(2↑𝑐(2 logb 9))) = (√‘9) |
29 | sqrt9 11092 | . 2 ⊢ (√‘9) = 3 | |
30 | 21, 28, 29 | 3eqtri 2214 | 1 ⊢ ((√‘2)↑𝑐(2 logb 9)) = 3 |
Colors of variables: wff set class |
Syntax hints: = wceq 1364 ∈ wcel 2160 class class class wbr 4018 ‘cfv 5235 (class class class)co 5897 ℝcr 7841 1c1 7843 # cap 8569 / cdiv 8660 ℕcn 8950 2c2 9001 3c3 9002 9c9 9008 ℤcz 9284 ℤ≥cuz 9559 ℝ+crp 9685 √csqrt 11040 ↑𝑐ccxp 14755 logb clogb 14838 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 615 ax-in2 616 ax-io 710 ax-5 1458 ax-7 1459 ax-gen 1460 ax-ie1 1504 ax-ie2 1505 ax-8 1515 ax-10 1516 ax-11 1517 ax-i12 1518 ax-bndl 1520 ax-4 1521 ax-17 1537 ax-i9 1541 ax-ial 1545 ax-i5r 1546 ax-13 2162 ax-14 2163 ax-ext 2171 ax-coll 4133 ax-sep 4136 ax-nul 4144 ax-pow 4192 ax-pr 4227 ax-un 4451 ax-setind 4554 ax-iinf 4605 ax-cnex 7933 ax-resscn 7934 ax-1cn 7935 ax-1re 7936 ax-icn 7937 ax-addcl 7938 ax-addrcl 7939 ax-mulcl 7940 ax-mulrcl 7941 ax-addcom 7942 ax-mulcom 7943 ax-addass 7944 ax-mulass 7945 ax-distr 7946 ax-i2m1 7947 ax-0lt1 7948 ax-1rid 7949 ax-0id 7950 ax-rnegex 7951 ax-precex 7952 ax-cnre 7953 ax-pre-ltirr 7954 ax-pre-ltwlin 7955 ax-pre-lttrn 7956 ax-pre-apti 7957 ax-pre-ltadd 7958 ax-pre-mulgt0 7959 ax-pre-mulext 7960 ax-arch 7961 ax-caucvg 7962 ax-pre-suploc 7963 ax-addf 7964 ax-mulf 7965 |
This theorem depends on definitions: df-bi 117 df-stab 832 df-dc 836 df-3or 981 df-3an 982 df-tru 1367 df-fal 1370 df-nf 1472 df-sb 1774 df-eu 2041 df-mo 2042 df-clab 2176 df-cleq 2182 df-clel 2185 df-nfc 2321 df-ne 2361 df-nel 2456 df-ral 2473 df-rex 2474 df-reu 2475 df-rmo 2476 df-rab 2477 df-v 2754 df-sbc 2978 df-csb 3073 df-dif 3146 df-un 3148 df-in 3150 df-ss 3157 df-nul 3438 df-if 3550 df-pw 3592 df-sn 3613 df-pr 3614 df-op 3616 df-uni 3825 df-int 3860 df-iun 3903 df-disj 3996 df-br 4019 df-opab 4080 df-mpt 4081 df-tr 4117 df-id 4311 df-po 4314 df-iso 4315 df-iord 4384 df-on 4386 df-ilim 4387 df-suc 4389 df-iom 4608 df-xp 4650 df-rel 4651 df-cnv 4652 df-co 4653 df-dm 4654 df-rn 4655 df-res 4656 df-ima 4657 df-iota 5196 df-fun 5237 df-fn 5238 df-f 5239 df-f1 5240 df-fo 5241 df-f1o 5242 df-fv 5243 df-isom 5244 df-riota 5852 df-ov 5900 df-oprab 5901 df-mpo 5902 df-of 6107 df-1st 6166 df-2nd 6167 df-recs 6331 df-irdg 6396 df-frec 6417 df-1o 6442 df-oadd 6446 df-er 6560 df-map 6677 df-pm 6678 df-en 6768 df-dom 6769 df-fin 6770 df-sup 7014 df-inf 7015 df-pnf 8025 df-mnf 8026 df-xr 8027 df-ltxr 8028 df-le 8029 df-sub 8161 df-neg 8162 df-reap 8563 df-ap 8570 df-div 8661 df-inn 8951 df-2 9009 df-3 9010 df-4 9011 df-5 9012 df-6 9013 df-7 9014 df-8 9015 df-9 9016 df-n0 9208 df-z 9285 df-uz 9560 df-q 9652 df-rp 9686 df-xneg 9804 df-xadd 9805 df-ioo 9924 df-ico 9926 df-icc 9927 df-fz 10041 df-fzo 10175 df-seqfrec 10479 df-exp 10554 df-fac 10741 df-bc 10763 df-ihash 10791 df-shft 10859 df-cj 10886 df-re 10887 df-im 10888 df-rsqrt 11042 df-abs 11043 df-clim 11322 df-sumdc 11397 df-ef 11691 df-e 11692 df-rest 12749 df-topgen 12768 df-psmet 13873 df-xmet 13874 df-met 13875 df-bl 13876 df-mopn 13877 df-top 13975 df-topon 13988 df-bases 14020 df-ntr 14073 df-cn 14165 df-cnp 14166 df-tx 14230 df-cncf 14535 df-limced 14602 df-dvap 14603 df-relog 14756 df-rpcxp 14757 df-logb 14839 |
This theorem is referenced by: 2irrexpq 14871 2irrexpqap 14873 |
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