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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 10595 | . . . 4 ⊢ 1 ∈ ℂ | |
2 | 8re 11734 | . . . . 5 ⊢ 8 ∈ ℝ | |
3 | 2 | recni 10655 | . . . 4 ⊢ 8 ∈ ℂ |
4 | 4cn 11723 | . . . 4 ⊢ 4 ∈ ℂ | |
5 | 3cn 11719 | . . . 4 ⊢ 3 ∈ ℂ | |
6 | 8pos 11750 | . . . . 5 ⊢ 0 < 8 | |
7 | 2, 6 | gt0ne0ii 11176 | . . . 4 ⊢ 8 ≠ 0 |
8 | 3ne0 11744 | . . . 4 ⊢ 3 ≠ 0 | |
9 | 1, 3, 4, 5, 7, 8 | divmuldivi 11400 | . . 3 ⊢ ((1 / 8) · (4 / 3)) = ((1 · 4) / (8 · 3)) |
10 | 1, 4 | mulcomi 10649 | . . . 4 ⊢ (1 · 4) = (4 · 1) |
11 | 2cn 11713 | . . . . . . . 8 ⊢ 2 ∈ ℂ | |
12 | 4, 11, 5 | mul32i 10836 | . . . . . . 7 ⊢ ((4 · 2) · 3) = ((4 · 3) · 2) |
13 | 4t2e8 11806 | . . . . . . . 8 ⊢ (4 · 2) = 8 | |
14 | 13 | oveq1i 7166 | . . . . . . 7 ⊢ ((4 · 2) · 3) = (8 · 3) |
15 | 12, 14 | eqtr3i 2846 | . . . . . 6 ⊢ ((4 · 3) · 2) = (8 · 3) |
16 | 4, 5, 11 | mulassi 10652 | . . . . . 6 ⊢ ((4 · 3) · 2) = (4 · (3 · 2)) |
17 | 15, 16 | eqtr3i 2846 | . . . . 5 ⊢ (8 · 3) = (4 · (3 · 2)) |
18 | 3t2e6 11804 | . . . . . 6 ⊢ (3 · 2) = 6 | |
19 | 18 | oveq2i 7167 | . . . . 5 ⊢ (4 · (3 · 2)) = (4 · 6) |
20 | 17, 19 | eqtri 2844 | . . . 4 ⊢ (8 · 3) = (4 · 6) |
21 | 10, 20 | oveq12i 7168 | . . 3 ⊢ ((1 · 4) / (8 · 3)) = ((4 · 1) / (4 · 6)) |
22 | 9, 21 | eqtri 2844 | . 2 ⊢ ((1 / 8) · (4 / 3)) = ((4 · 1) / (4 · 6)) |
23 | 6re 11728 | . . . 4 ⊢ 6 ∈ ℝ | |
24 | 23 | recni 10655 | . . 3 ⊢ 6 ∈ ℂ |
25 | 6pos 11748 | . . . 4 ⊢ 0 < 6 | |
26 | 23, 25 | gt0ne0ii 11176 | . . 3 ⊢ 6 ≠ 0 |
27 | 4ne0 11746 | . . 3 ⊢ 4 ≠ 0 | |
28 | divcan5 11342 | . . . 4 ⊢ ((1 ∈ ℂ ∧ (6 ∈ ℂ ∧ 6 ≠ 0) ∧ (4 ∈ ℂ ∧ 4 ≠ 0)) → ((4 · 1) / (4 · 6)) = (1 / 6)) | |
29 | 1, 28 | mp3an1 1444 | . . 3 ⊢ (((6 ∈ ℂ ∧ 6 ≠ 0) ∧ (4 ∈ ℂ ∧ 4 ≠ 0)) → ((4 · 1) / (4 · 6)) = (1 / 6)) |
30 | 24, 26, 4, 27, 29 | mp4an 691 | . 2 ⊢ ((4 · 1) / (4 · 6)) = (1 / 6) |
31 | 22, 30 | eqtri 2844 | 1 ⊢ ((1 / 8) · (4 / 3)) = (1 / 6) |
Colors of variables: wff setvar class |
Syntax hints: ∧ wa 398 = wceq 1537 ∈ wcel 2114 ≠ wne 3016 (class class class)co 7156 ℂcc 10535 0cc0 10537 1c1 10538 · cmul 10542 / cdiv 11297 2c2 11693 3c3 11694 4c4 11695 6c6 11697 8c8 11699 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2793 ax-sep 5203 ax-nul 5210 ax-pow 5266 ax-pr 5330 ax-un 7461 ax-resscn 10594 ax-1cn 10595 ax-icn 10596 ax-addcl 10597 ax-addrcl 10598 ax-mulcl 10599 ax-mulrcl 10600 ax-mulcom 10601 ax-addass 10602 ax-mulass 10603 ax-distr 10604 ax-i2m1 10605 ax-1ne0 10606 ax-1rid 10607 ax-rnegex 10608 ax-rrecex 10609 ax-cnre 10610 ax-pre-lttri 10611 ax-pre-lttrn 10612 ax-pre-ltadd 10613 ax-pre-mulgt0 10614 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-mo 2622 df-eu 2654 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ne 3017 df-nel 3124 df-ral 3143 df-rex 3144 df-reu 3145 df-rmo 3146 df-rab 3147 df-v 3496 df-sbc 3773 df-csb 3884 df-dif 3939 df-un 3941 df-in 3943 df-ss 3952 df-nul 4292 df-if 4468 df-pw 4541 df-sn 4568 df-pr 4570 df-op 4574 df-uni 4839 df-br 5067 df-opab 5129 df-mpt 5147 df-id 5460 df-po 5474 df-so 5475 df-xp 5561 df-rel 5562 df-cnv 5563 df-co 5564 df-dm 5565 df-rn 5566 df-res 5567 df-ima 5568 df-iota 6314 df-fun 6357 df-fn 6358 df-f 6359 df-f1 6360 df-fo 6361 df-f1o 6362 df-fv 6363 df-riota 7114 df-ov 7159 df-oprab 7160 df-mpo 7161 df-er 8289 df-en 8510 df-dom 8511 df-sdom 8512 df-pnf 10677 df-mnf 10678 df-xr 10679 df-ltxr 10680 df-le 10681 df-sub 10872 df-neg 10873 df-div 11298 df-2 11701 df-3 11702 df-4 11703 df-5 11704 df-6 11705 df-7 11706 df-8 11707 |
This theorem is referenced by: (None) |
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