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Mirrors > Home > ILE Home > Th. List > 8th4div3 | 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 7713 | . . . 4 ⊢ 1 ∈ ℂ | |
2 | 8re 8805 | . . . . 5 ⊢ 8 ∈ ℝ | |
3 | 2 | recni 7778 | . . . 4 ⊢ 8 ∈ ℂ |
4 | 4cn 8798 | . . . 4 ⊢ 4 ∈ ℂ | |
5 | 3cn 8795 | . . . 4 ⊢ 3 ∈ ℂ | |
6 | 8pos 8823 | . . . . 5 ⊢ 0 < 8 | |
7 | 2, 6 | gt0ap0ii 8390 | . . . 4 ⊢ 8 # 0 |
8 | 3re 8794 | . . . . 5 ⊢ 3 ∈ ℝ | |
9 | 3pos 8814 | . . . . 5 ⊢ 0 < 3 | |
10 | 8, 9 | gt0ap0ii 8390 | . . . 4 ⊢ 3 # 0 |
11 | 1, 3, 4, 5, 7, 10 | divmuldivapi 8532 | . . 3 ⊢ ((1 / 8) · (4 / 3)) = ((1 · 4) / (8 · 3)) |
12 | 1, 4 | mulcomi 7772 | . . . 4 ⊢ (1 · 4) = (4 · 1) |
13 | 2cn 8791 | . . . . . . . 8 ⊢ 2 ∈ ℂ | |
14 | 4, 13, 5 | mul32i 7909 | . . . . . . 7 ⊢ ((4 · 2) · 3) = ((4 · 3) · 2) |
15 | 4t2e8 8878 | . . . . . . . 8 ⊢ (4 · 2) = 8 | |
16 | 15 | oveq1i 5784 | . . . . . . 7 ⊢ ((4 · 2) · 3) = (8 · 3) |
17 | 14, 16 | eqtr3i 2162 | . . . . . 6 ⊢ ((4 · 3) · 2) = (8 · 3) |
18 | 4, 5, 13 | mulassi 7775 | . . . . . 6 ⊢ ((4 · 3) · 2) = (4 · (3 · 2)) |
19 | 17, 18 | eqtr3i 2162 | . . . . 5 ⊢ (8 · 3) = (4 · (3 · 2)) |
20 | 3t2e6 8876 | . . . . . 6 ⊢ (3 · 2) = 6 | |
21 | 20 | oveq2i 5785 | . . . . 5 ⊢ (4 · (3 · 2)) = (4 · 6) |
22 | 19, 21 | eqtri 2160 | . . . 4 ⊢ (8 · 3) = (4 · 6) |
23 | 12, 22 | oveq12i 5786 | . . 3 ⊢ ((1 · 4) / (8 · 3)) = ((4 · 1) / (4 · 6)) |
24 | 11, 23 | eqtri 2160 | . 2 ⊢ ((1 / 8) · (4 / 3)) = ((4 · 1) / (4 · 6)) |
25 | 6re 8801 | . . . 4 ⊢ 6 ∈ ℝ | |
26 | 25 | recni 7778 | . . 3 ⊢ 6 ∈ ℂ |
27 | 6pos 8821 | . . . 4 ⊢ 0 < 6 | |
28 | 25, 27 | gt0ap0ii 8390 | . . 3 ⊢ 6 # 0 |
29 | 4re 8797 | . . . 4 ⊢ 4 ∈ ℝ | |
30 | 4pos 8817 | . . . 4 ⊢ 0 < 4 | |
31 | 29, 30 | gt0ap0ii 8390 | . . 3 ⊢ 4 # 0 |
32 | divcanap5 8474 | . . . 4 ⊢ ((1 ∈ ℂ ∧ (6 ∈ ℂ ∧ 6 # 0) ∧ (4 ∈ ℂ ∧ 4 # 0)) → ((4 · 1) / (4 · 6)) = (1 / 6)) | |
33 | 1, 32 | mp3an1 1302 | . . 3 ⊢ (((6 ∈ ℂ ∧ 6 # 0) ∧ (4 ∈ ℂ ∧ 4 # 0)) → ((4 · 1) / (4 · 6)) = (1 / 6)) |
34 | 26, 28, 4, 31, 33 | mp4an 423 | . 2 ⊢ ((4 · 1) / (4 · 6)) = (1 / 6) |
35 | 24, 34 | eqtri 2160 | 1 ⊢ ((1 / 8) · (4 / 3)) = (1 / 6) |
Colors of variables: wff set class |
Syntax hints: ∧ wa 103 = wceq 1331 ∈ wcel 1480 class class class wbr 3929 (class class class)co 5774 ℂcc 7618 0cc0 7620 1c1 7621 · cmul 7625 # cap 8343 / cdiv 8432 2c2 8771 3c3 8772 4c4 8773 6c6 8775 8c8 8777 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 603 ax-in2 604 ax-io 698 ax-5 1423 ax-7 1424 ax-gen 1425 ax-ie1 1469 ax-ie2 1470 ax-8 1482 ax-10 1483 ax-11 1484 ax-i12 1485 ax-bndl 1486 ax-4 1487 ax-13 1491 ax-14 1492 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2121 ax-sep 4046 ax-pow 4098 ax-pr 4131 ax-un 4355 ax-setind 4452 ax-cnex 7711 ax-resscn 7712 ax-1cn 7713 ax-1re 7714 ax-icn 7715 ax-addcl 7716 ax-addrcl 7717 ax-mulcl 7718 ax-mulrcl 7719 ax-addcom 7720 ax-mulcom 7721 ax-addass 7722 ax-mulass 7723 ax-distr 7724 ax-i2m1 7725 ax-0lt1 7726 ax-1rid 7727 ax-0id 7728 ax-rnegex 7729 ax-precex 7730 ax-cnre 7731 ax-pre-ltirr 7732 ax-pre-ltwlin 7733 ax-pre-lttrn 7734 ax-pre-apti 7735 ax-pre-ltadd 7736 ax-pre-mulgt0 7737 ax-pre-mulext 7738 |
This theorem depends on definitions: df-bi 116 df-3an 964 df-tru 1334 df-fal 1337 df-nf 1437 df-sb 1736 df-eu 2002 df-mo 2003 df-clab 2126 df-cleq 2132 df-clel 2135 df-nfc 2270 df-ne 2309 df-nel 2404 df-ral 2421 df-rex 2422 df-reu 2423 df-rmo 2424 df-rab 2425 df-v 2688 df-sbc 2910 df-dif 3073 df-un 3075 df-in 3077 df-ss 3084 df-pw 3512 df-sn 3533 df-pr 3534 df-op 3536 df-uni 3737 df-br 3930 df-opab 3990 df-id 4215 df-po 4218 df-iso 4219 df-xp 4545 df-rel 4546 df-cnv 4547 df-co 4548 df-dm 4549 df-iota 5088 df-fun 5125 df-fv 5131 df-riota 5730 df-ov 5777 df-oprab 5778 df-mpo 5779 df-pnf 7802 df-mnf 7803 df-xr 7804 df-ltxr 7805 df-le 7806 df-sub 7935 df-neg 7936 df-reap 8337 df-ap 8344 df-div 8433 df-2 8779 df-3 8780 df-4 8781 df-5 8782 df-6 8783 df-7 8784 df-8 8785 |
This theorem is referenced by: (None) |
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