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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 11297 | . . . 4 ⊢ 1 ∈ ℂ | |
| 2 | 8cn 12480 | . . . 4 ⊢ 8 ∈ ℂ | |
| 3 | 4cn 12468 | . . . 4 ⊢ 4 ∈ ℂ | |
| 4 | 3cn 12464 | . . . 4 ⊢ 3 ∈ ℂ | |
| 5 | 8re 12479 | . . . . 5 ⊢ 8 ∈ ℝ | |
| 6 | 8pos 12498 | . . . . 5 ⊢ 0 < 8 | |
| 7 | 5, 6 | gt0ne0ii 11892 | . . . 4 ⊢ 8 ≠ 0 |
| 8 | 3ne0 12492 | . . . 4 ⊢ 3 ≠ 0 | |
| 9 | 1, 2, 3, 4, 7, 8 | divmuldivi 12117 | . . 3 ⊢ ((1 / 8) · (4 / 3)) = ((1 · 4) / (8 · 3)) |
| 10 | 1, 3 | mulcomi 11356 | . . . 4 ⊢ (1 · 4) = (4 · 1) |
| 11 | 2cn 12458 | . . . . . 6 ⊢ 2 ∈ ℂ | |
| 12 | 3, 11, 4 | mulassi 11359 | . . . . 5 ⊢ ((4 · 2) · 3) = (4 · (2 · 3)) |
| 13 | 4t2e8 12551 | . . . . . 6 ⊢ (4 · 2) = 8 | |
| 14 | 13 | oveq1i 7461 | . . . . 5 ⊢ ((4 · 2) · 3) = (8 · 3) |
| 15 | 2t3e6 12549 | . . . . . 6 ⊢ (2 · 3) = 6 | |
| 16 | 15 | oveq2i 7462 | . . . . 5 ⊢ (4 · (2 · 3)) = (4 · 6) |
| 17 | 12, 14, 16 | 3eqtr3i 2794 | . . . 4 ⊢ (8 · 3) = (4 · 6) |
| 18 | 10, 17 | oveq12i 7463 | . . 3 ⊢ ((1 · 4) / (8 · 3)) = ((4 · 1) / (4 · 6)) |
| 19 | 9, 18 | eqtri 2786 | . 2 ⊢ ((1 / 8) · (4 / 3)) = ((4 · 1) / (4 · 6)) |
| 20 | 6cn 12474 | . . 3 ⊢ 6 ∈ ℂ | |
| 21 | 6re 12473 | . . . 4 ⊢ 6 ∈ ℝ | |
| 22 | 6pos 12496 | . . . 4 ⊢ 0 < 6 | |
| 23 | 21, 22 | gt0ne0ii 11892 | . . 3 ⊢ 6 ≠ 0 |
| 24 | 4ne0 12494 | . . 3 ⊢ 4 ≠ 0 | |
| 25 | divcan5 12059 | . . . 4 ⊢ ((1 ∈ ℂ ∧ (6 ∈ ℂ ∧ 6 ≠ 0) ∧ (4 ∈ ℂ ∧ 4 ≠ 0)) → ((4 · 1) / (4 · 6)) = (1 / 6)) | |
| 26 | 1, 25 | mp3an1 1478 | . . 3 ⊢ (((6 ∈ ℂ ∧ 6 ≠ 0) ∧ (4 ∈ ℂ ∧ 4 ≠ 0)) → ((4 · 1) / (4 · 6)) = (1 / 6)) |
| 27 | 20, 23, 3, 24, 26 | mp4an 706 | . 2 ⊢ ((4 · 1) / (4 · 6)) = (1 / 6) |
| 28 | 19, 27 | eqtri 2786 | 1 ⊢ ((1 / 8) · (4 / 3)) = (1 / 6) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ∧ wa 401 = wceq 1570 ∈ wcel 2147 ≠ wne 2959 (class class class)co 7451 ℂcc 11237 0cc0 11239 1c1 11240 · cmul 11244 / cdiv 12013 2c2 12437 3c3 12438 4c4 12439 6c6 12441 8c8 12443 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1945 ax-6 2002 ax-7 2043 ax-8 2149 ax-9 2157 ax-10 2180 ax-11 2197 ax-12 2216 ax-ext 2735 ax-sep 5255 ax-nul 5266 ax-pow 5334 ax-pr 5398 ax-un 7783 ax-resscn 11296 ax-1cn 11297 ax-icn 11298 ax-addcl 11299 ax-addrcl 11300 ax-mulcl 11301 ax-mulrcl 11302 ax-mulcom 11303 ax-addass 11304 ax-mulass 11305 ax-distr 11306 ax-i2m1 11307 ax-1ne0 11308 ax-1rid 11309 ax-rnegex 11310 ax-rrecex 11311 ax-cnre 11312 ax-pre-lttri 11313 ax-pre-lttrn 11314 ax-pre-ltadd 11315 ax-pre-mulgt0 11316 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2102 df-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2839 df-nfc 2913 df-ne 2960 df-nel 3066 df-ral 3081 df-rex 3091 df-rmo 3369 df-reu 3370 df-rab 3417 df-v 3456 df-sbc 3743 df-csb 3852 df-ss 3901 df-pss 4017 df-dif 4050 df-in 4094 df-un 4154 df-nul 4282 df-if 4486 df-pw 4562 df-sn 4589 df-pr 4591 df-op 4841 df-uni 4873 df-iun 4958 df-br 5109 df-opab 5174 df-mpt 5193 df-tr 5219 df-id 5553 df-eprel 5558 df-po 5566 df-so 5567 df-fr 5611 df-we 5613 df-xp 5664 df-rel 5665 df-cnv 5666 df-co 5667 df-dm 5668 df-rn 5669 df-res 5670 df-ima 5671 df-pred 6330 df-ord 6391 df-on 6392 df-lim 6393 df-suc 6394 df-iota 6520 df-fun 6568 df-fn 6569 df-f 6570 df-f1 6571 df-fo 6572 df-f1o 6573 df-fv 6574 df-riota 7408 df-ov 7454 df-oprab 7455 df-mpo 7456 df-om 7912 df-2nd 8036 df-frecs 8337 df-wrecs 8368 df-recs 8417 df-rdg 8456 df-er 8755 df-en 9012 df-dom 9013 df-sdom 9014 df-pnf 11384 df-mnf 11385 df-xr 11386 df-ltxr 11387 df-le 11388 df-sub 11582 df-neg 11583 df-div 12014 df-nn 12376 df-2 12445 df-3 12446 df-4 12447 df-5 12448 df-6 12449 df-7 12450 df-8 12451 |
| This theorem is used by: (None) |
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