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| Mirrors > Home > MPE Home > Th. List > Mathboxes > threehalves | Structured version Visualization version GIF version | ||
| Description: Example theorem demonstrating decimal expansions. (Contributed by Thierry Arnoux, 27-Dec-2021.) |
| Ref | Expression |
|---|---|
| threehalves | ⊢ (3 / 2) = (1.5) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 3re 12426 | . . . . 5 ⊢ 3 ∈ ℝ | |
| 2 | 2re 12420 | . . . . 5 ⊢ 2 ∈ ℝ | |
| 3 | 2ne0 12452 | . . . . 5 ⊢ 2 ≠ 0 | |
| 4 | 1, 2, 3 | redivcli 12087 | . . . 4 ⊢ (3 / 2) ∈ ℝ |
| 5 | 4 | recni 11326 | . . 3 ⊢ (3 / 2) ∈ ℂ |
| 6 | 1nn0 12625 | . . . . 5 ⊢ 1 ∈ ℕ0 | |
| 7 | 5re 12433 | . . . . 5 ⊢ 5 ∈ ℝ | |
| 8 | dpcl 33503 | . . . . 5 ⊢ ((1 ∈ ℕ0 ∧ 5 ∈ ℝ) → (1.5) ∈ ℝ) | |
| 9 | 6, 7, 8 | mp2an 705 | . . . 4 ⊢ (1.5) ∈ ℝ |
| 10 | 9 | recni 11326 | . . 3 ⊢ (1.5) ∈ ℂ |
| 11 | 2cnne0 12558 | . . 3 ⊢ (2 ∈ ℂ ∧ 2 ≠ 0) | |
| 12 | 5, 10, 11 | 3pm3.2i 1358 | . 2 ⊢ ((3 / 2) ∈ ℂ ∧ (1.5) ∈ ℂ ∧ (2 ∈ ℂ ∧ 2 ≠ 0)) |
| 13 | 5nn0 12629 | . . . . 5 ⊢ 5 ∈ ℕ0 | |
| 14 | 3nn0 12627 | . . . . 5 ⊢ 3 ∈ ℕ0 | |
| 15 | 0nn0 12624 | . . . . 5 ⊢ 0 ∈ ℕ0 | |
| 16 | eqid 2760 | . . . . . 6 ⊢ ;15 = ;15 | |
| 17 | df-2 12408 | . . . . . . . 8 ⊢ 2 = (1 + 1) | |
| 18 | 17 | oveq1i 7430 | . . . . . . 7 ⊢ (2 + 1) = ((1 + 1) + 1) |
| 19 | 2p1e3 12487 | . . . . . . 7 ⊢ (2 + 1) = 3 | |
| 20 | 18, 19 | eqtr3i 2785 | . . . . . 6 ⊢ ((1 + 1) + 1) = 3 |
| 21 | 5p5e10 12893 | . . . . . 6 ⊢ (5 + 5) = ;10 | |
| 22 | 6, 13, 6, 13, 16, 16, 20, 15, 21 | decaddc 12877 | . . . . 5 ⊢ (;15 + ;15) = ;30 |
| 23 | 6, 13, 6, 13, 14, 15, 22 | dpadd 33523 | . . . 4 ⊢ ((1.5) + (1.5)) = (3.0) |
| 24 | 14 | dp0u 33513 | . . . 4 ⊢ (3.0) = 3 |
| 25 | 23, 24 | eqtri 2783 | . . 3 ⊢ ((1.5) + (1.5)) = 3 |
| 26 | 10 | times2i 12484 | . . 3 ⊢ ((1.5) · 2) = ((1.5) + (1.5)) |
| 27 | 1 | recni 11326 | . . . 4 ⊢ 3 ∈ ℂ |
| 28 | 11 | simpli 489 | . . . 4 ⊢ 2 ∈ ℂ |
| 29 | 27, 28, 3 | divcan1i 12064 | . . 3 ⊢ ((3 / 2) · 2) = 3 |
| 30 | 25, 26, 29 | 3eqtr4ri 2794 | . 2 ⊢ ((3 / 2) · 2) = ((1.5) · 2) |
| 31 | mulcan2 11957 | . . 3 ⊢ (((3 / 2) ∈ ℂ ∧ (1.5) ∈ ℂ ∧ (2 ∈ ℂ ∧ 2 ≠ 0)) → (((3 / 2) · 2) = ((1.5) · 2) ↔ (3 / 2) = (1.5))) | |
| 32 | 31 | biimpa 482 | . 2 ⊢ ((((3 / 2) ∈ ℂ ∧ (1.5) ∈ ℂ ∧ (2 ∈ ℂ ∧ 2 ≠ 0)) ∧ ((3 / 2) · 2) = ((1.5) · 2)) → (3 / 2) = (1.5)) |
| 33 | 12, 30, 32 | mp2an 705 | 1 ⊢ (3 / 2) = (1.5) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ∧ wa 401 ∧ w3a 1103 = wceq 1569 ∈ wcel 2144 ≠ wne 2955 (class class class)co 7420 ℂcc 11201 ℝcr 11202 0cc0 11203 1c1 11204 + caddc 11206 · cmul 11208 / cdiv 11976 2c2 12400 3c3 12401 5c5 12403 ℕ0cn0 12609 ;cdc 12817 .cdp 33500 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1942 ax-6 1999 ax-7 2040 ax-8 2146 ax-9 2154 ax-10 2177 ax-11 2193 ax-12 2212 ax-ext 2732 ax-sep 5248 ax-nul 5259 ax-pow 5326 ax-pr 5390 ax-un 7751 ax-resscn 11260 ax-1cn 11261 ax-icn 11262 ax-addcl 11263 ax-addrcl 11264 ax-mulcl 11265 ax-mulrcl 11266 ax-mulcom 11267 ax-addass 11268 ax-mulass 11269 ax-distr 11270 ax-i2m1 11271 ax-1ne0 11272 ax-1rid 11273 ax-rnegex 11274 ax-rrecex 11275 ax-cnre 11276 ax-pre-lttri 11277 ax-pre-lttrn 11278 ax-pre-ltadd 11279 ax-pre-mulgt0 11280 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1572 df-fal 1582 df-ex 1812 df-nf 1816 df-sb 2099 df-mo 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-nel 3062 df-ral 3077 df-rex 3087 df-rmo 3365 df-reu 3366 df-rab 3413 df-v 3452 df-sbc 3739 df-csb 3847 df-ss 3896 df-pss 4014 df-dif 4047 df-in 4091 df-un 4151 df-nul 4279 df-if 4482 df-pw 4558 df-sn 4585 df-pr 4587 df-op 4835 df-uni 4867 df-iun 4952 df-br 5103 df-opab 5167 df-mpt 5186 df-tr 5212 df-id 5545 df-eprel 5550 df-po 5558 df-so 5559 df-fr 5603 df-we 5605 df-xp 5656 df-rel 5657 df-cnv 5658 df-co 5659 df-dm 5660 df-rn 5661 df-res 5662 df-ima 5663 df-pred 6304 df-ord 6365 df-on 6366 df-lim 6367 df-suc 6368 df-iota 6494 df-fun 6540 df-fn 6541 df-f 6542 df-f1 6543 df-fo 6544 df-f1o 6545 df-fv 6546 df-riota 7377 df-ov 7423 df-oprab 7424 df-mpo 7425 df-om 7878 df-2nd 8002 df-frecs 8302 df-wrecs 8333 df-recs 8382 df-rdg 8421 df-er 8720 df-en 8977 df-dom 8978 df-sdom 8979 df-pnf 11348 df-mnf 11349 df-xr 11350 df-ltxr 11351 df-le 11352 df-sub 11546 df-neg 11547 df-div 11977 df-nn 12339 df-2 12408 df-3 12409 df-4 12410 df-5 12411 df-6 12412 df-7 12413 df-8 12414 df-9 12415 df-n0 12610 df-dec 12818 df-dp2 33484 df-dp 33501 |
| This theorem is used by: (None) |
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