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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 8266 | . . . 4 ⊢ 1 ∈ ℂ | |
| 2 | 8re 9372 | . . . . 5 ⊢ 8 ∈ ℝ | |
| 3 | 2 | recni 8332 | . . . 4 ⊢ 8 ∈ ℂ |
| 4 | 4cn 9365 | . . . 4 ⊢ 4 ∈ ℂ | |
| 5 | 3cn 9362 | . . . 4 ⊢ 3 ∈ ℂ | |
| 6 | 8pos 9390 | . . . . 5 ⊢ 0 < 8 | |
| 7 | 2, 6 | gt0ap0ii 8950 | . . . 4 ⊢ 8 # 0 |
| 8 | 3re 9361 | . . . . 5 ⊢ 3 ∈ ℝ | |
| 9 | 3pos 9381 | . . . . 5 ⊢ 0 < 3 | |
| 10 | 8, 9 | gt0ap0ii 8950 | . . . 4 ⊢ 3 # 0 |
| 11 | 1, 3, 4, 5, 7, 10 | divmuldivapi 9096 | . . 3 ⊢ ((1 / 8) · (4 / 3)) = ((1 · 4) / (8 · 3)) |
| 12 | 1, 4 | mulcomi 8326 | . . . 4 ⊢ (1 · 4) = (4 · 1) |
| 13 | 2cn 9358 | . . . . . . . 8 ⊢ 2 ∈ ℂ | |
| 14 | 4, 13, 5 | mul32i 8467 | . . . . . . 7 ⊢ ((4 · 2) · 3) = ((4 · 3) · 2) |
| 15 | 4t2e8 9446 | . . . . . . . 8 ⊢ (4 · 2) = 8 | |
| 16 | 15 | oveq1i 6089 | . . . . . . 7 ⊢ ((4 · 2) · 3) = (8 · 3) |
| 17 | 14, 16 | eqtr3i 2261 | . . . . . 6 ⊢ ((4 · 3) · 2) = (8 · 3) |
| 18 | 4, 5, 13 | mulassi 8329 | . . . . . 6 ⊢ ((4 · 3) · 2) = (4 · (3 · 2)) |
| 19 | 17, 18 | eqtr3i 2261 | . . . . 5 ⊢ (8 · 3) = (4 · (3 · 2)) |
| 20 | 3t2e6 9444 | . . . . . 6 ⊢ (3 · 2) = 6 | |
| 21 | 20 | oveq2i 6090 | . . . . 5 ⊢ (4 · (3 · 2)) = (4 · 6) |
| 22 | 19, 21 | eqtri 2259 | . . . 4 ⊢ (8 · 3) = (4 · 6) |
| 23 | 12, 22 | oveq12i 6091 | . . 3 ⊢ ((1 · 4) / (8 · 3)) = ((4 · 1) / (4 · 6)) |
| 24 | 11, 23 | eqtri 2259 | . 2 ⊢ ((1 / 8) · (4 / 3)) = ((4 · 1) / (4 · 6)) |
| 25 | 6re 9368 | . . . 4 ⊢ 6 ∈ ℝ | |
| 26 | 25 | recni 8332 | . . 3 ⊢ 6 ∈ ℂ |
| 27 | 6pos 9388 | . . . 4 ⊢ 0 < 6 | |
| 28 | 25, 27 | gt0ap0ii 8950 | . . 3 ⊢ 6 # 0 |
| 29 | 4re 9364 | . . . 4 ⊢ 4 ∈ ℝ | |
| 30 | 4pos 9384 | . . . 4 ⊢ 0 < 4 | |
| 31 | 29, 30 | gt0ap0ii 8950 | . . 3 ⊢ 4 # 0 |
| 32 | divcanap5 9038 | . . . 4 ⊢ ((1 ∈ ℂ ∧ (6 ∈ ℂ ∧ 6 # 0) ∧ (4 ∈ ℂ ∧ 4 # 0)) → ((4 · 1) / (4 · 6)) = (1 / 6)) | |
| 33 | 1, 32 | mp3an1 1365 | . . 3 ⊢ (((6 ∈ ℂ ∧ 6 # 0) ∧ (4 ∈ ℂ ∧ 4 # 0)) → ((4 · 1) / (4 · 6)) = (1 / 6)) |
| 34 | 26, 28, 4, 31, 33 | mp4an 431 | . 2 ⊢ ((4 · 1) / (4 · 6)) = (1 / 6) |
| 35 | 24, 34 | eqtri 2259 | 1 ⊢ ((1 / 8) · (4 / 3)) = (1 / 6) |
| Colors of variables: wff set class |
| Syntax hints: ∧ wa 104 = wceq 1402 ∈ wcel 2209 class class class wbr 4128 (class class class)co 6079 ℂcc 8171 0cc0 8173 1c1 8174 · cmul 8178 # cap 8903 / cdiv 8996 2c2 9338 3c3 9339 4c4 9340 6c6 9342 8c8 9344 |
| 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 623 ax-in2 624 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-14 2212 ax-ext 2220 ax-sep 4247 ax-pow 4309 ax-pr 4344 ax-un 4576 ax-setind 4682 ax-cnex 8264 ax-resscn 8265 ax-1cn 8266 ax-1re 8267 ax-icn 8268 ax-addcl 8269 ax-addrcl 8270 ax-mulcl 8271 ax-mulrcl 8272 ax-addcom 8273 ax-mulcom 8274 ax-addass 8275 ax-mulass 8276 ax-distr 8277 ax-i2m1 8278 ax-0lt1 8279 ax-1rid 8280 ax-0id 8281 ax-rnegex 8282 ax-precex 8283 ax-cnre 8284 ax-pre-ltirr 8285 ax-pre-ltwlin 8286 ax-pre-lttrn 8287 ax-pre-apti 8288 ax-pre-ltadd 8289 ax-pre-mulgt0 8290 ax-pre-mulext 8291 |
| This theorem depends on definitions: df-bi 117 df-3an 1011 df-tru 1405 df-fal 1408 df-nf 1514 df-sb 1816 df-eu 2089 df-mo 2090 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-ne 2421 df-nel 2516 df-ral 2533 df-rex 2534 df-reu 2535 df-rmo 2536 df-rab 2537 df-v 2823 df-sbc 3052 df-dif 3222 df-un 3224 df-in 3226 df-ss 3233 df-pw 3690 df-sn 3714 df-pr 3715 df-op 3717 df-uni 3934 df-br 4129 df-opab 4191 df-id 4436 df-po 4439 df-iso 4440 df-xp 4778 df-rel 4779 df-cnv 4780 df-co 4781 df-dm 4782 df-iota 5335 df-fun 5377 df-fv 5383 df-riota 6032 df-ov 6082 df-oprab 6083 df-mpo 6084 df-pnf 8356 df-mnf 8357 df-xr 8358 df-ltxr 8359 df-le 8360 df-sub 8493 df-neg 8494 df-reap 8897 df-ap 8904 df-div 8997 df-2 9346 df-3 9347 df-4 9348 df-5 9349 df-6 9350 df-7 9351 df-8 9352 |
| This theorem is referenced by: (None) |
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