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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 12797 resp. 2logb9irr 15762), satisfying the statement in 2irrexpq 15767. (Contributed by AV, 29-Dec-2022.) |
| Ref | Expression |
|---|---|
| sqrt2cxp2logb9e3 | ⊢ ((√‘2)↑𝑐(2 logb 9)) = 3 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 2rp 9936 | . . . . . 6 ⊢ 2 ∈ ℝ+ | |
| 2 | rpcxpsqrt 15713 | . . . . . 6 ⊢ (2 ∈ ℝ+ → (2↑𝑐(1 / 2)) = (√‘2)) | |
| 3 | 1, 2 | ax-mp 5 | . . . . 5 ⊢ (2↑𝑐(1 / 2)) = (√‘2) |
| 4 | 3 | eqcomi 2235 | . . . 4 ⊢ (√‘2) = (2↑𝑐(1 / 2)) |
| 5 | 4 | oveq1i 6038 | . . 3 ⊢ ((√‘2)↑𝑐(2 logb 9)) = ((2↑𝑐(1 / 2))↑𝑐(2 logb 9)) |
| 6 | halfre 9400 | . . . 4 ⊢ (1 / 2) ∈ ℝ | |
| 7 | 2z 9550 | . . . . . 6 ⊢ 2 ∈ ℤ | |
| 8 | uzid 9813 | . . . . . 6 ⊢ (2 ∈ ℤ → 2 ∈ (ℤ≥‘2)) | |
| 9 | 7, 8 | ax-mp 5 | . . . . 5 ⊢ 2 ∈ (ℤ≥‘2) |
| 10 | 9nn 9355 | . . . . . 6 ⊢ 9 ∈ ℕ | |
| 11 | nnrp 9941 | . . . . . 6 ⊢ (9 ∈ ℕ → 9 ∈ ℝ+) | |
| 12 | 10, 11 | ax-mp 5 | . . . . 5 ⊢ 9 ∈ ℝ+ |
| 13 | relogbzcl 15743 | . . . . 5 ⊢ ((2 ∈ (ℤ≥‘2) ∧ 9 ∈ ℝ+) → (2 logb 9) ∈ ℝ) | |
| 14 | 9, 12, 13 | mp2an 426 | . . . 4 ⊢ (2 logb 9) ∈ ℝ |
| 15 | cxpcom 15729 | . . . 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 1374 | . . 3 ⊢ ((2↑𝑐(1 / 2))↑𝑐(2 logb 9)) = ((2↑𝑐(2 logb 9))↑𝑐(1 / 2)) |
| 17 | rpcxpcl 15694 | . . . . 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 15713 | . . . 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 2256 | . 2 ⊢ ((√‘2)↑𝑐(2 logb 9)) = (√‘(2↑𝑐(2 logb 9))) |
| 22 | 1re 8221 | . . . . 5 ⊢ 1 ∈ ℝ | |
| 23 | 2re 9256 | . . . . 5 ⊢ 2 ∈ ℝ | |
| 24 | 1lt2 9356 | . . . . 5 ⊢ 1 < 2 | |
| 25 | 22, 23, 24 | gtapii 8857 | . . . 4 ⊢ 2 # 1 |
| 26 | rpcxplogb 15755 | . . . 4 ⊢ ((2 ∈ ℝ+ ∧ 2 # 1 ∧ 9 ∈ ℝ+) → (2↑𝑐(2 logb 9)) = 9) | |
| 27 | 1, 25, 12, 26 | mp3an 1374 | . . 3 ⊢ (2↑𝑐(2 logb 9)) = 9 |
| 28 | 27 | fveq2i 5651 | . 2 ⊢ (√‘(2↑𝑐(2 logb 9))) = (√‘9) |
| 29 | sqrt9 11669 | . 2 ⊢ (√‘9) = 3 | |
| 30 | 21, 28, 29 | 3eqtri 2256 | 1 ⊢ ((√‘2)↑𝑐(2 logb 9)) = 3 |
| Colors of variables: wff set class |
| Syntax hints: = wceq 1398 ∈ wcel 2202 class class class wbr 4093 ‘cfv 5333 (class class class)co 6028 ℝcr 8074 1c1 8076 # cap 8804 / cdiv 8895 ℕcn 9186 2c2 9237 3c3 9238 9c9 9244 ℤcz 9522 ℤ≥cuz 9798 ℝ+crp 9931 √csqrt 11617 ↑𝑐ccxp 15648 logb clogb 15734 |
| 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 619 ax-in2 620 ax-io 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-13 2204 ax-14 2205 ax-ext 2213 ax-coll 4209 ax-sep 4212 ax-nul 4220 ax-pow 4270 ax-pr 4305 ax-un 4536 ax-setind 4641 ax-iinf 4692 ax-cnex 8166 ax-resscn 8167 ax-1cn 8168 ax-1re 8169 ax-icn 8170 ax-addcl 8171 ax-addrcl 8172 ax-mulcl 8173 ax-mulrcl 8174 ax-addcom 8175 ax-mulcom 8176 ax-addass 8177 ax-mulass 8178 ax-distr 8179 ax-i2m1 8180 ax-0lt1 8181 ax-1rid 8182 ax-0id 8183 ax-rnegex 8184 ax-precex 8185 ax-cnre 8186 ax-pre-ltirr 8187 ax-pre-ltwlin 8188 ax-pre-lttrn 8189 ax-pre-apti 8190 ax-pre-ltadd 8191 ax-pre-mulgt0 8192 ax-pre-mulext 8193 ax-arch 8194 ax-caucvg 8195 ax-pre-suploc 8196 ax-addf 8197 ax-mulf 8198 |
| This theorem depends on definitions: df-bi 117 df-stab 839 df-dc 843 df-3or 1006 df-3an 1007 df-tru 1401 df-fal 1404 df-nf 1510 df-sb 1811 df-eu 2082 df-mo 2083 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2364 df-ne 2404 df-nel 2499 df-ral 2516 df-rex 2517 df-reu 2518 df-rmo 2519 df-rab 2520 df-v 2805 df-sbc 3033 df-csb 3129 df-dif 3203 df-un 3205 df-in 3207 df-ss 3214 df-nul 3497 df-if 3608 df-pw 3658 df-sn 3679 df-pr 3680 df-op 3682 df-uni 3899 df-int 3934 df-iun 3977 df-disj 4070 df-br 4094 df-opab 4156 df-mpt 4157 df-tr 4193 df-id 4396 df-po 4399 df-iso 4400 df-iord 4469 df-on 4471 df-ilim 4472 df-suc 4474 df-iom 4695 df-xp 4737 df-rel 4738 df-cnv 4739 df-co 4740 df-dm 4741 df-rn 4742 df-res 4743 df-ima 4744 df-iota 5293 df-fun 5335 df-fn 5336 df-f 5337 df-f1 5338 df-fo 5339 df-f1o 5340 df-fv 5341 df-isom 5342 df-riota 5981 df-ov 6031 df-oprab 6032 df-mpo 6033 df-of 6244 df-1st 6312 df-2nd 6313 df-recs 6514 df-irdg 6579 df-frec 6600 df-1o 6625 df-oadd 6629 df-er 6745 df-map 6862 df-pm 6863 df-en 6953 df-dom 6954 df-fin 6955 df-sup 7226 df-inf 7227 df-pnf 8259 df-mnf 8260 df-xr 8261 df-ltxr 8262 df-le 8263 df-sub 8395 df-neg 8396 df-reap 8798 df-ap 8805 df-div 8896 df-inn 9187 df-2 9245 df-3 9246 df-4 9247 df-5 9248 df-6 9249 df-7 9250 df-8 9251 df-9 9252 df-n0 9446 df-z 9523 df-uz 9799 df-q 9897 df-rp 9932 df-xneg 10050 df-xadd 10051 df-ioo 10170 df-ico 10172 df-icc 10173 df-fz 10287 df-fzo 10421 df-seqfrec 10754 df-exp 10845 df-fac 11032 df-bc 11054 df-ihash 11082 df-shft 11436 df-cj 11463 df-re 11464 df-im 11465 df-rsqrt 11619 df-abs 11620 df-clim 11900 df-sumdc 11975 df-ef 12270 df-e 12271 df-rest 13385 df-topgen 13404 df-psmet 14619 df-xmet 14620 df-met 14621 df-bl 14622 df-mopn 14623 df-top 14789 df-topon 14802 df-bases 14834 df-ntr 14887 df-cn 14979 df-cnp 14980 df-tx 15044 df-cncf 15362 df-limced 15447 df-dvap 15448 df-relog 15649 df-rpcxp 15650 df-logb 15735 |
| This theorem is referenced by: 2irrexpq 15767 2irrexpqap 15769 |
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