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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 10589 | . . . 4 ⊢ 1 ∈ ℂ | |
2 | 8re 11727 | . . . . 5 ⊢ 8 ∈ ℝ | |
3 | 2 | recni 10649 | . . . 4 ⊢ 8 ∈ ℂ |
4 | 4cn 11716 | . . . 4 ⊢ 4 ∈ ℂ | |
5 | 3cn 11712 | . . . 4 ⊢ 3 ∈ ℂ | |
6 | 8pos 11743 | . . . . 5 ⊢ 0 < 8 | |
7 | 2, 6 | gt0ne0ii 11170 | . . . 4 ⊢ 8 ≠ 0 |
8 | 3ne0 11737 | . . . 4 ⊢ 3 ≠ 0 | |
9 | 1, 3, 4, 5, 7, 8 | divmuldivi 11394 | . . 3 ⊢ ((1 / 8) · (4 / 3)) = ((1 · 4) / (8 · 3)) |
10 | 1, 4 | mulcomi 10643 | . . . 4 ⊢ (1 · 4) = (4 · 1) |
11 | 2cn 11706 | . . . . . . . 8 ⊢ 2 ∈ ℂ | |
12 | 4, 11, 5 | mul32i 10830 | . . . . . . 7 ⊢ ((4 · 2) · 3) = ((4 · 3) · 2) |
13 | 4t2e8 11799 | . . . . . . . 8 ⊢ (4 · 2) = 8 | |
14 | 13 | oveq1i 7160 | . . . . . . 7 ⊢ ((4 · 2) · 3) = (8 · 3) |
15 | 12, 14 | eqtr3i 2846 | . . . . . 6 ⊢ ((4 · 3) · 2) = (8 · 3) |
16 | 4, 5, 11 | mulassi 10646 | . . . . . 6 ⊢ ((4 · 3) · 2) = (4 · (3 · 2)) |
17 | 15, 16 | eqtr3i 2846 | . . . . 5 ⊢ (8 · 3) = (4 · (3 · 2)) |
18 | 3t2e6 11797 | . . . . . 6 ⊢ (3 · 2) = 6 | |
19 | 18 | oveq2i 7161 | . . . . 5 ⊢ (4 · (3 · 2)) = (4 · 6) |
20 | 17, 19 | eqtri 2844 | . . . 4 ⊢ (8 · 3) = (4 · 6) |
21 | 10, 20 | oveq12i 7162 | . . 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 11721 | . . . 4 ⊢ 6 ∈ ℝ | |
24 | 23 | recni 10649 | . . 3 ⊢ 6 ∈ ℂ |
25 | 6pos 11741 | . . . 4 ⊢ 0 < 6 | |
26 | 23, 25 | gt0ne0ii 11170 | . . 3 ⊢ 6 ≠ 0 |
27 | 4ne0 11739 | . . 3 ⊢ 4 ≠ 0 | |
28 | divcan5 11336 | . . . 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 1533 ∈ wcel 2110 ≠ wne 3016 (class class class)co 7150 ℂcc 10529 0cc0 10531 1c1 10532 · cmul 10536 / cdiv 11291 2c2 11686 3c3 11687 4c4 11688 6c6 11690 8c8 11692 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1907 ax-6 1966 ax-7 2011 ax-8 2112 ax-9 2120 ax-10 2141 ax-11 2157 ax-12 2173 ax-ext 2793 ax-sep 5195 ax-nul 5202 ax-pow 5258 ax-pr 5321 ax-un 7455 ax-resscn 10588 ax-1cn 10589 ax-icn 10590 ax-addcl 10591 ax-addrcl 10592 ax-mulcl 10593 ax-mulrcl 10594 ax-mulcom 10595 ax-addass 10596 ax-mulass 10597 ax-distr 10598 ax-i2m1 10599 ax-1ne0 10600 ax-1rid 10601 ax-rnegex 10602 ax-rrecex 10603 ax-cnre 10604 ax-pre-lttri 10605 ax-pre-lttrn 10606 ax-pre-ltadd 10607 ax-pre-mulgt0 10608 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1536 df-ex 1777 df-nf 1781 df-sb 2066 df-mo 2618 df-eu 2650 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 3772 df-csb 3883 df-dif 3938 df-un 3940 df-in 3942 df-ss 3951 df-nul 4291 df-if 4467 df-pw 4540 df-sn 4561 df-pr 4563 df-op 4567 df-uni 4832 df-br 5059 df-opab 5121 df-mpt 5139 df-id 5454 df-po 5468 df-so 5469 df-xp 5555 df-rel 5556 df-cnv 5557 df-co 5558 df-dm 5559 df-rn 5560 df-res 5561 df-ima 5562 df-iota 6308 df-fun 6351 df-fn 6352 df-f 6353 df-f1 6354 df-fo 6355 df-f1o 6356 df-fv 6357 df-riota 7108 df-ov 7153 df-oprab 7154 df-mpo 7155 df-er 8283 df-en 8504 df-dom 8505 df-sdom 8506 df-pnf 10671 df-mnf 10672 df-xr 10673 df-ltxr 10674 df-le 10675 df-sub 10866 df-neg 10867 df-div 11292 df-2 11694 df-3 11695 df-4 11696 df-5 11697 df-6 11698 df-7 11699 df-8 11700 |
This theorem is referenced by: (None) |
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