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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 12961 resp. 2logb9irr 16129), satisfying the statement in 2irrexpq 16134. (Contributed by AV, 29-Dec-2022.) |
| Ref | Expression |
|---|---|
| sqrt2cxp2logb9e3 | ⊢ ((√‘2)↑𝑐(2 logb 9)) = 3 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 2rp 10070 | . . . . . 6 ⊢ 2 ∈ ℝ+ | |
| 2 | rpcxpsqrt 16080 | . . . . . 6 ⊢ (2 ∈ ℝ+ → (2↑𝑐(1 / 2)) = (√‘2)) | |
| 3 | 1, 2 | ax-mp 5 | . . . . 5 ⊢ (2↑𝑐(1 / 2)) = (√‘2) |
| 4 | 3 | eqcomi 2242 | . . . 4 ⊢ (√‘2) = (2↑𝑐(1 / 2)) |
| 5 | 4 | oveq1i 6095 | . . 3 ⊢ ((√‘2)↑𝑐(2 logb 9)) = ((2↑𝑐(1 / 2))↑𝑐(2 logb 9)) |
| 6 | halfre 9523 | . . . 4 ⊢ (1 / 2) ∈ ℝ | |
| 7 | 2z 9677 | . . . . . 6 ⊢ 2 ∈ ℤ | |
| 8 | uzid 9946 | . . . . . 6 ⊢ (2 ∈ ℤ → 2 ∈ (ℤ≥‘2)) | |
| 9 | 7, 8 | ax-mp 5 | . . . . 5 ⊢ 2 ∈ (ℤ≥‘2) |
| 10 | 9nn 9478 | . . . . . 6 ⊢ 9 ∈ ℕ | |
| 11 | nnrp 10075 | . . . . . 6 ⊢ (9 ∈ ℕ → 9 ∈ ℝ+) | |
| 12 | 10, 11 | ax-mp 5 | . . . . 5 ⊢ 9 ∈ ℝ+ |
| 13 | relogbzcl 16110 | . . . . 5 ⊢ ((2 ∈ (ℤ≥‘2) ∧ 9 ∈ ℝ+) → (2 logb 9) ∈ ℝ) | |
| 14 | 9, 12, 13 | mp2an 430 | . . . 4 ⊢ (2 logb 9) ∈ ℝ |
| 15 | cxpcom 16096 | . . . 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 1378 | . . 3 ⊢ ((2↑𝑐(1 / 2))↑𝑐(2 logb 9)) = ((2↑𝑐(2 logb 9))↑𝑐(1 / 2)) |
| 17 | rpcxpcl 16061 | . . . . 5 ⊢ ((2 ∈ ℝ+ ∧ (2 logb 9) ∈ ℝ) → (2↑𝑐(2 logb 9)) ∈ ℝ+) | |
| 18 | 1, 14, 17 | mp2an 430 | . . . 4 ⊢ (2↑𝑐(2 logb 9)) ∈ ℝ+ |
| 19 | rpcxpsqrt 16080 | . . . 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 2263 | . 2 ⊢ ((√‘2)↑𝑐(2 logb 9)) = (√‘(2↑𝑐(2 logb 9))) |
| 22 | 1re 8326 | . . . . 5 ⊢ 1 ∈ ℝ | |
| 23 | 2re 9377 | . . . . 5 ⊢ 2 ∈ ℝ | |
| 24 | 1lt2 9479 | . . . . 5 ⊢ 1 < 2 | |
| 25 | 22, 23, 24 | gtapii 8965 | . . . 4 ⊢ 2 # 1 |
| 26 | rpcxplogb 16122 | . . . 4 ⊢ ((2 ∈ ℝ+ ∧ 2 # 1 ∧ 9 ∈ ℝ+) → (2↑𝑐(2 logb 9)) = 9) | |
| 27 | 1, 25, 12, 26 | mp3an 1378 | . . 3 ⊢ (2↑𝑐(2 logb 9)) = 9 |
| 28 | 27 | fveq2i 5698 | . 2 ⊢ (√‘(2↑𝑐(2 logb 9))) = (√‘9) |
| 29 | sqrt9 11829 | . 2 ⊢ (√‘9) = 3 | |
| 30 | 21, 28, 29 | 3eqtri 2263 | 1 ⊢ ((√‘2)↑𝑐(2 logb 9)) = 3 |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: = wceq 1402 ∈ wcel 2209 class class class wbr 4130 ‘cfv 5377 (class class class)co 6085 ℝcr 8179 1c1 8181 # cap 8912 / cdiv 9005 ℕcn 9307 2c2 9358 3c3 9359 9c9 9365 ℤcz 9649 ℤ≥cuz 9931 ℝ+crp 10065 √csqrt 11777 ↑𝑐ccxp 16011 logb clogb 16101 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 623 ax-in2 624 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-14 2212 ax-ext 2220 ax-coll 4246 ax-sep 4249 ax-nul 4259 ax-pow 4311 ax-pr 4346 ax-un 4578 ax-setind 4684 ax-iinf 4735 ax-cnex 8271 ax-resscn 8272 ax-1cn 8273 ax-1re 8274 ax-icn 8275 ax-addcl 8276 ax-addrcl 8277 ax-mulcl 8278 ax-mulrcl 8279 ax-addcom 8280 ax-mulcom 8281 ax-addass 8282 ax-mulass 8283 ax-distr 8284 ax-i2m1 8285 ax-0lt1 8286 ax-1rid 8287 ax-0id 8288 ax-rnegex 8289 ax-precex 8290 ax-cnre 8291 ax-pre-ltirr 8292 ax-pre-ltwlin 8293 ax-pre-lttrn 8294 ax-pre-apti 8295 ax-pre-ltadd 8296 ax-pre-mulgt0 8297 ax-pre-mulext 8298 ax-arch 8299 ax-caucvg 8300 ax-pre-suploc 8301 ax-addf 8302 ax-mulf 8303 |
| This proof depends on definitions: df-bi 117 df-stab 843 df-dc 847 df-3or 1010 df-3an 1011 df-tru 1405 df-fal 1408 df-nf 1514 df-sb 1816 df-eu 2089 df-mo 2090 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-ne 2421 df-nel 2516 df-ral 2533 df-rex 2534 df-reu 2535 df-rmo 2536 df-rab 2537 df-v 2823 df-sbc 3052 df-csb 3148 df-dif 3222 df-un 3224 df-in 3226 df-ss 3233 df-nul 3521 df-if 3639 df-pw 3690 df-sn 3715 df-pr 3716 df-op 3718 df-uni 3936 df-int 3971 df-iun 4014 df-disj 4107 df-br 4131 df-opab 4193 df-mpt 4194 df-tr 4230 df-id 4438 df-po 4441 df-iso 4442 df-iord 4511 df-on 4513 df-ilim 4514 df-suc 4516 df-iom 4738 df-xp 4780 df-rel 4781 df-cnv 4782 df-co 4783 df-dm 4784 df-rn 4785 df-res 4786 df-ima 4787 df-iota 5337 df-fun 5379 df-fn 5380 df-f 5381 df-f1 5382 df-fo 5383 df-f1o 5384 df-fv 5385 df-isom 5386 df-riota 6038 df-ov 6088 df-oprab 6089 df-mpo 6090 df-of 6302 df-1st 6374 df-2nd 6375 df-recs 6576 df-irdg 6641 df-frec 6662 df-1o 6687 df-oadd 6691 df-er 6807 df-map 6924 df-pm 6925 df-en 7023 df-dom 7024 df-fin 7025 df-sup 7325 df-inf 7326 df-pnf 8363 df-mnf 8364 df-xr 8365 df-ltxr 8366 df-le 8367 df-sub 8501 df-neg 8502 df-reap 8906 df-ap 8913 df-div 9006 df-inn 9308 df-2 9366 df-3 9367 df-4 9368 df-5 9369 df-6 9370 df-7 9371 df-8 9372 df-9 9373 df-n0 9569 df-z 9650 df-uz 9932 df-q 10030 df-rp 10066 df-xneg 10185 df-xadd 10186 df-ioo 10305 df-ico 10307 df-icc 10308 df-fz 10423 df-fzo 10561 df-seqfrec 10899 df-exp 10990 df-fac 11179 df-bc 11201 df-ihash 11230 df-shft 11595 df-cj 11622 df-re 11623 df-im 11624 df-rsqrt 11779 df-abs 11780 df-clim 12063 df-sumdc 12138 df-ef 12433 df-e 12434 df-rest 13646 df-topgen 13665 df-psmet 14931 df-xmet 14932 df-met 14933 df-bl 14934 df-mopn 14935 df-top 15151 df-topon 15164 df-bases 15196 df-ntr 15249 df-cn 15341 df-cnp 15342 df-tx 15406 df-cncf 15724 df-limced 15809 df-dvap 15810 df-relog 16012 df-rpcxp 16013 df-logb 16102 |
| This theorem is used by: 2irrexpq 16134 2irrexpqap 16136 |
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