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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 8279 | . . . 4 ⊢ 1 ∈ ℂ | |
| 2 | 8re 9399 | . . . . 5 ⊢ 8 ∈ ℝ | |
| 3 | 2 | recni 8345 | . . . 4 ⊢ 8 ∈ ℂ |
| 4 | 4cn 9392 | . . . 4 ⊢ 4 ∈ ℂ | |
| 5 | 3cn 9389 | . . . 4 ⊢ 3 ∈ ℂ | |
| 6 | 8pos 9417 | . . . . 5 ⊢ 0 < 8 | |
| 7 | 2, 6 | gt0ap0ii 8965 | . . . 4 ⊢ 8 # 0 |
| 8 | 3re 9388 | . . . . 5 ⊢ 3 ∈ ℝ | |
| 9 | 3pos 9408 | . . . . 5 ⊢ 0 < 3 | |
| 10 | 8, 9 | gt0ap0ii 8965 | . . . 4 ⊢ 3 # 0 |
| 11 | 1, 3, 4, 5, 7, 10 | divmuldivapi 9111 | . . 3 ⊢ ((1 / 8) · (4 / 3)) = ((1 · 4) / (8 · 3)) |
| 12 | 1, 4 | mulcomi 8339 | . . . 4 ⊢ (1 · 4) = (4 · 1) |
| 13 | 2cn 9385 | . . . . . . . 8 ⊢ 2 ∈ ℂ | |
| 14 | 4, 13, 5 | mul32i 8481 | . . . . . . 7 ⊢ ((4 · 2) · 3) = ((4 · 3) · 2) |
| 15 | 4t2e8 9474 | . . . . . . . 8 ⊢ (4 · 2) = 8 | |
| 16 | 15 | oveq1i 6098 | . . . . . . 7 ⊢ ((4 · 2) · 3) = (8 · 3) |
| 17 | 14, 16 | eqtr3i 2261 | . . . . . 6 ⊢ ((4 · 3) · 2) = (8 · 3) |
| 18 | 4, 5, 13 | mulassi 8342 | . . . . . 6 ⊢ ((4 · 3) · 2) = (4 · (3 · 2)) |
| 19 | 17, 18 | eqtr3i 2261 | . . . . 5 ⊢ (8 · 3) = (4 · (3 · 2)) |
| 20 | 3t2e6 9471 | . . . . . 6 ⊢ (3 · 2) = 6 | |
| 21 | 20 | oveq2i 6099 | . . . . 5 ⊢ (4 · (3 · 2)) = (4 · 6) |
| 22 | 19, 21 | eqtri 2259 | . . . 4 ⊢ (8 · 3) = (4 · 6) |
| 23 | 12, 22 | oveq12i 6100 | . . 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 9395 | . . . 4 ⊢ 6 ∈ ℝ | |
| 26 | 25 | recni 8345 | . . 3 ⊢ 6 ∈ ℂ |
| 27 | 6pos 9415 | . . . 4 ⊢ 0 < 6 | |
| 28 | 25, 27 | gt0ap0ii 8965 | . . 3 ⊢ 6 # 0 |
| 29 | 4re 9391 | . . . 4 ⊢ 4 ∈ ℝ | |
| 30 | 4pos 9411 | . . . 4 ⊢ 0 < 4 | |
| 31 | 29, 30 | gt0ap0ii 8965 | . . 3 ⊢ 4 # 0 |
| 32 | divcanap5 9053 | . . . 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 |
| This proof depends on syntax axioms: ∧ wa 104 = wceq 1402 ∈ wcel 2209 class class class wbr 4131 (class class class)co 6088 ℂcc 8184 0cc0 8186 1c1 8187 · cmul 8191 # cap 8918 / cdiv 9011 2c2 9365 3c3 9366 4c4 9367 6c6 9369 8c8 9371 |
| This proof depends on 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 4251 ax-pow 4313 ax-pr 4348 ax-un 4580 ax-setind 4686 ax-cnex 8277 ax-resscn 8278 ax-1cn 8279 ax-1re 8280 ax-icn 8281 ax-addcl 8282 ax-addrcl 8283 ax-mulcl 8284 ax-mulrcl 8285 ax-addcom 8286 ax-mulcom 8287 ax-addass 8288 ax-mulass 8289 ax-distr 8290 ax-i2m1 8291 ax-0lt1 8292 ax-1rid 8293 ax-0id 8294 ax-rnegex 8295 ax-precex 8296 ax-cnre 8297 ax-pre-ltirr 8298 ax-pre-ltwlin 8299 ax-pre-lttrn 8300 ax-pre-apti 8301 ax-pre-ltadd 8302 ax-pre-mulgt0 8303 ax-pre-mulext 8304 |
| This proof 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 3715 df-pr 3716 df-op 3718 df-uni 3936 df-br 4132 df-opab 4194 df-id 4440 df-po 4443 df-iso 4444 df-xp 4782 df-rel 4783 df-cnv 4784 df-co 4785 df-dm 4786 df-iota 5340 df-fun 5382 df-fv 5388 df-riota 6041 df-ov 6091 df-oprab 6092 df-mpo 6093 df-pnf 8369 df-mnf 8370 df-xr 8371 df-ltxr 8372 df-le 8373 df-sub 8507 df-neg 8508 df-reap 8912 df-ap 8919 df-div 9012 df-2 9373 df-3 9374 df-4 9375 df-5 9376 df-6 9377 df-7 9378 df-8 9379 |
| This theorem is used by: (None) |
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