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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 8125 | . . . 4 ⊢ 1 ∈ ℂ | |
| 2 | 8re 9228 | . . . . 5 ⊢ 8 ∈ ℝ | |
| 3 | 2 | recni 8191 | . . . 4 ⊢ 8 ∈ ℂ |
| 4 | 4cn 9221 | . . . 4 ⊢ 4 ∈ ℂ | |
| 5 | 3cn 9218 | . . . 4 ⊢ 3 ∈ ℂ | |
| 6 | 8pos 9246 | . . . . 5 ⊢ 0 < 8 | |
| 7 | 2, 6 | gt0ap0ii 8808 | . . . 4 ⊢ 8 # 0 |
| 8 | 3re 9217 | . . . . 5 ⊢ 3 ∈ ℝ | |
| 9 | 3pos 9237 | . . . . 5 ⊢ 0 < 3 | |
| 10 | 8, 9 | gt0ap0ii 8808 | . . . 4 ⊢ 3 # 0 |
| 11 | 1, 3, 4, 5, 7, 10 | divmuldivapi 8952 | . . 3 ⊢ ((1 / 8) · (4 / 3)) = ((1 · 4) / (8 · 3)) |
| 12 | 1, 4 | mulcomi 8185 | . . . 4 ⊢ (1 · 4) = (4 · 1) |
| 13 | 2cn 9214 | . . . . . . . 8 ⊢ 2 ∈ ℂ | |
| 14 | 4, 13, 5 | mul32i 8326 | . . . . . . 7 ⊢ ((4 · 2) · 3) = ((4 · 3) · 2) |
| 15 | 4t2e8 9302 | . . . . . . . 8 ⊢ (4 · 2) = 8 | |
| 16 | 15 | oveq1i 6028 | . . . . . . 7 ⊢ ((4 · 2) · 3) = (8 · 3) |
| 17 | 14, 16 | eqtr3i 2254 | . . . . . 6 ⊢ ((4 · 3) · 2) = (8 · 3) |
| 18 | 4, 5, 13 | mulassi 8188 | . . . . . 6 ⊢ ((4 · 3) · 2) = (4 · (3 · 2)) |
| 19 | 17, 18 | eqtr3i 2254 | . . . . 5 ⊢ (8 · 3) = (4 · (3 · 2)) |
| 20 | 3t2e6 9300 | . . . . . 6 ⊢ (3 · 2) = 6 | |
| 21 | 20 | oveq2i 6029 | . . . . 5 ⊢ (4 · (3 · 2)) = (4 · 6) |
| 22 | 19, 21 | eqtri 2252 | . . . 4 ⊢ (8 · 3) = (4 · 6) |
| 23 | 12, 22 | oveq12i 6030 | . . 3 ⊢ ((1 · 4) / (8 · 3)) = ((4 · 1) / (4 · 6)) |
| 24 | 11, 23 | eqtri 2252 | . 2 ⊢ ((1 / 8) · (4 / 3)) = ((4 · 1) / (4 · 6)) |
| 25 | 6re 9224 | . . . 4 ⊢ 6 ∈ ℝ | |
| 26 | 25 | recni 8191 | . . 3 ⊢ 6 ∈ ℂ |
| 27 | 6pos 9244 | . . . 4 ⊢ 0 < 6 | |
| 28 | 25, 27 | gt0ap0ii 8808 | . . 3 ⊢ 6 # 0 |
| 29 | 4re 9220 | . . . 4 ⊢ 4 ∈ ℝ | |
| 30 | 4pos 9240 | . . . 4 ⊢ 0 < 4 | |
| 31 | 29, 30 | gt0ap0ii 8808 | . . 3 ⊢ 4 # 0 |
| 32 | divcanap5 8894 | . . . 4 ⊢ ((1 ∈ ℂ ∧ (6 ∈ ℂ ∧ 6 # 0) ∧ (4 ∈ ℂ ∧ 4 # 0)) → ((4 · 1) / (4 · 6)) = (1 / 6)) | |
| 33 | 1, 32 | mp3an1 1360 | . . 3 ⊢ (((6 ∈ ℂ ∧ 6 # 0) ∧ (4 ∈ ℂ ∧ 4 # 0)) → ((4 · 1) / (4 · 6)) = (1 / 6)) |
| 34 | 26, 28, 4, 31, 33 | mp4an 427 | . 2 ⊢ ((4 · 1) / (4 · 6)) = (1 / 6) |
| 35 | 24, 34 | eqtri 2252 | 1 ⊢ ((1 / 8) · (4 / 3)) = (1 / 6) |
| Colors of variables: wff set class |
| Syntax hints: ∧ wa 104 = wceq 1397 ∈ wcel 2202 class class class wbr 4088 (class class class)co 6018 ℂcc 8030 0cc0 8032 1c1 8033 · cmul 8037 # cap 8761 / cdiv 8852 2c2 9194 3c3 9195 4c4 9196 6c6 9198 8c8 9200 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 619 ax-in2 620 ax-io 716 ax-5 1495 ax-7 1496 ax-gen 1497 ax-ie1 1541 ax-ie2 1542 ax-8 1552 ax-10 1553 ax-11 1554 ax-i12 1555 ax-bndl 1557 ax-4 1558 ax-17 1574 ax-i9 1578 ax-ial 1582 ax-i5r 1583 ax-13 2204 ax-14 2205 ax-ext 2213 ax-sep 4207 ax-pow 4264 ax-pr 4299 ax-un 4530 ax-setind 4635 ax-cnex 8123 ax-resscn 8124 ax-1cn 8125 ax-1re 8126 ax-icn 8127 ax-addcl 8128 ax-addrcl 8129 ax-mulcl 8130 ax-mulrcl 8131 ax-addcom 8132 ax-mulcom 8133 ax-addass 8134 ax-mulass 8135 ax-distr 8136 ax-i2m1 8137 ax-0lt1 8138 ax-1rid 8139 ax-0id 8140 ax-rnegex 8141 ax-precex 8142 ax-cnre 8143 ax-pre-ltirr 8144 ax-pre-ltwlin 8145 ax-pre-lttrn 8146 ax-pre-apti 8147 ax-pre-ltadd 8148 ax-pre-mulgt0 8149 ax-pre-mulext 8150 |
| This theorem depends on definitions: df-bi 117 df-3an 1006 df-tru 1400 df-fal 1403 df-nf 1509 df-sb 1811 df-eu 2082 df-mo 2083 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2363 df-ne 2403 df-nel 2498 df-ral 2515 df-rex 2516 df-reu 2517 df-rmo 2518 df-rab 2519 df-v 2804 df-sbc 3032 df-dif 3202 df-un 3204 df-in 3206 df-ss 3213 df-pw 3654 df-sn 3675 df-pr 3676 df-op 3678 df-uni 3894 df-br 4089 df-opab 4151 df-id 4390 df-po 4393 df-iso 4394 df-xp 4731 df-rel 4732 df-cnv 4733 df-co 4734 df-dm 4735 df-iota 5286 df-fun 5328 df-fv 5334 df-riota 5971 df-ov 6021 df-oprab 6022 df-mpo 6023 df-pnf 8216 df-mnf 8217 df-xr 8218 df-ltxr 8219 df-le 8220 df-sub 8352 df-neg 8353 df-reap 8755 df-ap 8762 df-div 8853 df-2 9202 df-3 9203 df-4 9204 df-5 9205 df-6 9206 df-7 9207 df-8 9208 |
| This theorem is referenced by: (None) |
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