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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 12302 resp. 2logb9irr 15103), satisfying the statement in 2irrexpq 15108. (Contributed by AV, 29-Dec-2022.) |
Ref | Expression |
---|---|
sqrt2cxp2logb9e3 | ⊢ ((√‘2)↑𝑐(2 logb 9)) = 3 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 2rp 9724 | . . . . . 6 ⊢ 2 ∈ ℝ+ | |
2 | rpcxpsqrt 15056 | . . . . . 6 ⊢ (2 ∈ ℝ+ → (2↑𝑐(1 / 2)) = (√‘2)) | |
3 | 1, 2 | ax-mp 5 | . . . . 5 ⊢ (2↑𝑐(1 / 2)) = (√‘2) |
4 | 3 | eqcomi 2197 | . . . 4 ⊢ (√‘2) = (2↑𝑐(1 / 2)) |
5 | 4 | oveq1i 5928 | . . 3 ⊢ ((√‘2)↑𝑐(2 logb 9)) = ((2↑𝑐(1 / 2))↑𝑐(2 logb 9)) |
6 | halfre 9195 | . . . 4 ⊢ (1 / 2) ∈ ℝ | |
7 | 2z 9345 | . . . . . 6 ⊢ 2 ∈ ℤ | |
8 | uzid 9606 | . . . . . 6 ⊢ (2 ∈ ℤ → 2 ∈ (ℤ≥‘2)) | |
9 | 7, 8 | ax-mp 5 | . . . . 5 ⊢ 2 ∈ (ℤ≥‘2) |
10 | 9nn 9150 | . . . . . 6 ⊢ 9 ∈ ℕ | |
11 | nnrp 9729 | . . . . . 6 ⊢ (9 ∈ ℕ → 9 ∈ ℝ+) | |
12 | 10, 11 | ax-mp 5 | . . . . 5 ⊢ 9 ∈ ℝ+ |
13 | relogbzcl 15084 | . . . . 5 ⊢ ((2 ∈ (ℤ≥‘2) ∧ 9 ∈ ℝ+) → (2 logb 9) ∈ ℝ) | |
14 | 9, 12, 13 | mp2an 426 | . . . 4 ⊢ (2 logb 9) ∈ ℝ |
15 | cxpcom 15071 | . . . 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 15038 | . . . . 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 15056 | . . . 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 2218 | . 2 ⊢ ((√‘2)↑𝑐(2 logb 9)) = (√‘(2↑𝑐(2 logb 9))) |
22 | 1re 8018 | . . . . 5 ⊢ 1 ∈ ℝ | |
23 | 2re 9052 | . . . . 5 ⊢ 2 ∈ ℝ | |
24 | 1lt2 9151 | . . . . 5 ⊢ 1 < 2 | |
25 | 22, 23, 24 | gtapii 8653 | . . . 4 ⊢ 2 # 1 |
26 | rpcxplogb 15096 | . . . 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 5557 | . 2 ⊢ (√‘(2↑𝑐(2 logb 9))) = (√‘9) |
29 | sqrt9 11192 | . 2 ⊢ (√‘9) = 3 | |
30 | 21, 28, 29 | 3eqtri 2218 | 1 ⊢ ((√‘2)↑𝑐(2 logb 9)) = 3 |
Colors of variables: wff set class |
Syntax hints: = wceq 1364 ∈ wcel 2164 class class class wbr 4029 ‘cfv 5254 (class class class)co 5918 ℝcr 7871 1c1 7873 # cap 8600 / cdiv 8691 ℕcn 8982 2c2 9033 3c3 9034 9c9 9040 ℤcz 9317 ℤ≥cuz 9592 ℝ+crp 9719 √csqrt 11140 ↑𝑐ccxp 14992 logb clogb 15075 |
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 2166 ax-14 2167 ax-ext 2175 ax-coll 4144 ax-sep 4147 ax-nul 4155 ax-pow 4203 ax-pr 4238 ax-un 4464 ax-setind 4569 ax-iinf 4620 ax-cnex 7963 ax-resscn 7964 ax-1cn 7965 ax-1re 7966 ax-icn 7967 ax-addcl 7968 ax-addrcl 7969 ax-mulcl 7970 ax-mulrcl 7971 ax-addcom 7972 ax-mulcom 7973 ax-addass 7974 ax-mulass 7975 ax-distr 7976 ax-i2m1 7977 ax-0lt1 7978 ax-1rid 7979 ax-0id 7980 ax-rnegex 7981 ax-precex 7982 ax-cnre 7983 ax-pre-ltirr 7984 ax-pre-ltwlin 7985 ax-pre-lttrn 7986 ax-pre-apti 7987 ax-pre-ltadd 7988 ax-pre-mulgt0 7989 ax-pre-mulext 7990 ax-arch 7991 ax-caucvg 7992 ax-pre-suploc 7993 ax-addf 7994 ax-mulf 7995 |
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 2045 df-mo 2046 df-clab 2180 df-cleq 2186 df-clel 2189 df-nfc 2325 df-ne 2365 df-nel 2460 df-ral 2477 df-rex 2478 df-reu 2479 df-rmo 2480 df-rab 2481 df-v 2762 df-sbc 2986 df-csb 3081 df-dif 3155 df-un 3157 df-in 3159 df-ss 3166 df-nul 3447 df-if 3558 df-pw 3603 df-sn 3624 df-pr 3625 df-op 3627 df-uni 3836 df-int 3871 df-iun 3914 df-disj 4007 df-br 4030 df-opab 4091 df-mpt 4092 df-tr 4128 df-id 4324 df-po 4327 df-iso 4328 df-iord 4397 df-on 4399 df-ilim 4400 df-suc 4402 df-iom 4623 df-xp 4665 df-rel 4666 df-cnv 4667 df-co 4668 df-dm 4669 df-rn 4670 df-res 4671 df-ima 4672 df-iota 5215 df-fun 5256 df-fn 5257 df-f 5258 df-f1 5259 df-fo 5260 df-f1o 5261 df-fv 5262 df-isom 5263 df-riota 5873 df-ov 5921 df-oprab 5922 df-mpo 5923 df-of 6130 df-1st 6193 df-2nd 6194 df-recs 6358 df-irdg 6423 df-frec 6444 df-1o 6469 df-oadd 6473 df-er 6587 df-map 6704 df-pm 6705 df-en 6795 df-dom 6796 df-fin 6797 df-sup 7043 df-inf 7044 df-pnf 8056 df-mnf 8057 df-xr 8058 df-ltxr 8059 df-le 8060 df-sub 8192 df-neg 8193 df-reap 8594 df-ap 8601 df-div 8692 df-inn 8983 df-2 9041 df-3 9042 df-4 9043 df-5 9044 df-6 9045 df-7 9046 df-8 9047 df-9 9048 df-n0 9241 df-z 9318 df-uz 9593 df-q 9685 df-rp 9720 df-xneg 9838 df-xadd 9839 df-ioo 9958 df-ico 9960 df-icc 9961 df-fz 10075 df-fzo 10209 df-seqfrec 10519 df-exp 10610 df-fac 10797 df-bc 10819 df-ihash 10847 df-shft 10959 df-cj 10986 df-re 10987 df-im 10988 df-rsqrt 11142 df-abs 11143 df-clim 11422 df-sumdc 11497 df-ef 11791 df-e 11792 df-rest 12852 df-topgen 12871 df-psmet 14039 df-xmet 14040 df-met 14041 df-bl 14042 df-mopn 14043 df-top 14166 df-topon 14179 df-bases 14211 df-ntr 14264 df-cn 14356 df-cnp 14357 df-tx 14421 df-cncf 14726 df-limced 14810 df-dvap 14811 df-relog 14993 df-rpcxp 14994 df-logb 15076 |
This theorem is referenced by: 2irrexpq 15108 2irrexpqap 15110 |
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