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| Mirrors > Home > MPE Home > Th. List > 8th4div3 | Structured version Visualization version GIF version | ||
| Description: An eighth of four thirds is a sixth. (Contributed by Paul Chapman, 24-Nov-2007.) |
| Ref | Expression |
|---|---|
| 8th4div3 | ⊢ ((1 / 8) · (4 / 3)) = (1 / 6) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ax-1cn 11067 | . . . 4 ⊢ 1 ∈ ℂ | |
| 2 | 8re 12224 | . . . . 5 ⊢ 8 ∈ ℝ | |
| 3 | 2 | recni 11129 | . . . 4 ⊢ 8 ∈ ℂ |
| 4 | 4cn 12213 | . . . 4 ⊢ 4 ∈ ℂ | |
| 5 | 3cn 12209 | . . . 4 ⊢ 3 ∈ ℂ | |
| 6 | 8pos 12240 | . . . . 5 ⊢ 0 < 8 | |
| 7 | 2, 6 | gt0ne0ii 11656 | . . . 4 ⊢ 8 ≠ 0 |
| 8 | 3ne0 12234 | . . . 4 ⊢ 3 ≠ 0 | |
| 9 | 1, 3, 4, 5, 7, 8 | divmuldivi 11884 | . . 3 ⊢ ((1 / 8) · (4 / 3)) = ((1 · 4) / (8 · 3)) |
| 10 | 1, 4 | mulcomi 11123 | . . . 4 ⊢ (1 · 4) = (4 · 1) |
| 11 | 2cn 12203 | . . . . . . . 8 ⊢ 2 ∈ ℂ | |
| 12 | 4, 11, 5 | mul32i 11312 | . . . . . . 7 ⊢ ((4 · 2) · 3) = ((4 · 3) · 2) |
| 13 | 4t2e8 12291 | . . . . . . . 8 ⊢ (4 · 2) = 8 | |
| 14 | 13 | oveq1i 7359 | . . . . . . 7 ⊢ ((4 · 2) · 3) = (8 · 3) |
| 15 | 12, 14 | eqtr3i 2754 | . . . . . 6 ⊢ ((4 · 3) · 2) = (8 · 3) |
| 16 | 4, 5, 11 | mulassi 11126 | . . . . . 6 ⊢ ((4 · 3) · 2) = (4 · (3 · 2)) |
| 17 | 15, 16 | eqtr3i 2754 | . . . . 5 ⊢ (8 · 3) = (4 · (3 · 2)) |
| 18 | 3t2e6 12289 | . . . . . 6 ⊢ (3 · 2) = 6 | |
| 19 | 18 | oveq2i 7360 | . . . . 5 ⊢ (4 · (3 · 2)) = (4 · 6) |
| 20 | 17, 19 | eqtri 2752 | . . . 4 ⊢ (8 · 3) = (4 · 6) |
| 21 | 10, 20 | oveq12i 7361 | . . 3 ⊢ ((1 · 4) / (8 · 3)) = ((4 · 1) / (4 · 6)) |
| 22 | 9, 21 | eqtri 2752 | . 2 ⊢ ((1 / 8) · (4 / 3)) = ((4 · 1) / (4 · 6)) |
| 23 | 6re 12218 | . . . 4 ⊢ 6 ∈ ℝ | |
| 24 | 23 | recni 11129 | . . 3 ⊢ 6 ∈ ℂ |
| 25 | 6pos 12238 | . . . 4 ⊢ 0 < 6 | |
| 26 | 23, 25 | gt0ne0ii 11656 | . . 3 ⊢ 6 ≠ 0 |
| 27 | 4ne0 12236 | . . 3 ⊢ 4 ≠ 0 | |
| 28 | divcan5 11826 | . . . 4 ⊢ ((1 ∈ ℂ ∧ (6 ∈ ℂ ∧ 6 ≠ 0) ∧ (4 ∈ ℂ ∧ 4 ≠ 0)) → ((4 · 1) / (4 · 6)) = (1 / 6)) | |
| 29 | 1, 28 | mp3an1 1450 | . . 3 ⊢ (((6 ∈ ℂ ∧ 6 ≠ 0) ∧ (4 ∈ ℂ ∧ 4 ≠ 0)) → ((4 · 1) / (4 · 6)) = (1 / 6)) |
| 30 | 24, 26, 4, 27, 29 | mp4an 693 | . 2 ⊢ ((4 · 1) / (4 · 6)) = (1 / 6) |
| 31 | 22, 30 | eqtri 2752 | 1 ⊢ ((1 / 8) · (4 / 3)) = (1 / 6) |
| Colors of variables: wff setvar class |
| Syntax hints: ∧ wa 395 = wceq 1540 ∈ wcel 2109 ≠ wne 2925 (class class class)co 7349 ℂcc 11007 0cc0 11009 1c1 11010 · cmul 11014 / cdiv 11777 2c2 12183 3c3 12184 4c4 12185 6c6 12187 8c8 12189 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2008 ax-8 2111 ax-9 2119 ax-10 2142 ax-11 2158 ax-12 2178 ax-ext 2701 ax-sep 5235 ax-nul 5245 ax-pow 5304 ax-pr 5371 ax-un 7671 ax-resscn 11066 ax-1cn 11067 ax-icn 11068 ax-addcl 11069 ax-addrcl 11070 ax-mulcl 11071 ax-mulrcl 11072 ax-mulcom 11073 ax-addass 11074 ax-mulass 11075 ax-distr 11076 ax-i2m1 11077 ax-1ne0 11078 ax-1rid 11079 ax-rnegex 11080 ax-rrecex 11081 ax-cnre 11082 ax-pre-lttri 11083 ax-pre-lttrn 11084 ax-pre-ltadd 11085 ax-pre-mulgt0 11086 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2066 df-mo 2533 df-eu 2562 df-clab 2708 df-cleq 2721 df-clel 2803 df-nfc 2878 df-ne 2926 df-nel 3030 df-ral 3045 df-rex 3054 df-rmo 3343 df-reu 3344 df-rab 3395 df-v 3438 df-sbc 3743 df-csb 3852 df-dif 3906 df-un 3908 df-in 3910 df-ss 3920 df-pss 3923 df-nul 4285 df-if 4477 df-pw 4553 df-sn 4578 df-pr 4580 df-op 4584 df-uni 4859 df-iun 4943 df-br 5093 df-opab 5155 df-mpt 5174 df-tr 5200 df-id 5514 df-eprel 5519 df-po 5527 df-so 5528 df-fr 5572 df-we 5574 df-xp 5625 df-rel 5626 df-cnv 5627 df-co 5628 df-dm 5629 df-rn 5630 df-res 5631 df-ima 5632 df-pred 6249 df-ord 6310 df-on 6311 df-lim 6312 df-suc 6313 df-iota 6438 df-fun 6484 df-fn 6485 df-f 6486 df-f1 6487 df-fo 6488 df-f1o 6489 df-fv 6490 df-riota 7306 df-ov 7352 df-oprab 7353 df-mpo 7354 df-om 7800 df-2nd 7925 df-frecs 8214 df-wrecs 8245 df-recs 8294 df-rdg 8332 df-er 8625 df-en 8873 df-dom 8874 df-sdom 8875 df-pnf 11151 df-mnf 11152 df-xr 11153 df-ltxr 11154 df-le 11155 df-sub 11349 df-neg 11350 df-div 11778 df-nn 12129 df-2 12191 df-3 12192 df-4 12193 df-5 12194 df-6 12195 df-7 12196 df-8 12197 |
| This theorem is referenced by: (None) |
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