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Mirrors > Home > MPE Home > Th. List > xp1d2m1eqxm1d2 | Structured version Visualization version GIF version |
Description: A complex number increased by 1, then divided by 2, then decreased by 1 equals the complex number decreased by 1 and then divided by 2. (Contributed by AV, 24-May-2020.) |
Ref | Expression |
---|---|
xp1d2m1eqxm1d2 | ⊢ (𝑋 ∈ ℂ → (((𝑋 + 1) / 2) − 1) = ((𝑋 − 1) / 2)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | peano2cn 11431 | . . . 4 ⊢ (𝑋 ∈ ℂ → (𝑋 + 1) ∈ ℂ) | |
2 | 1 | halfcld 12509 | . . 3 ⊢ (𝑋 ∈ ℂ → ((𝑋 + 1) / 2) ∈ ℂ) |
3 | peano2cnm 11573 | . . 3 ⊢ (((𝑋 + 1) / 2) ∈ ℂ → (((𝑋 + 1) / 2) − 1) ∈ ℂ) | |
4 | 2, 3 | syl 17 | . 2 ⊢ (𝑋 ∈ ℂ → (((𝑋 + 1) / 2) − 1) ∈ ℂ) |
5 | peano2cnm 11573 | . . 3 ⊢ (𝑋 ∈ ℂ → (𝑋 − 1) ∈ ℂ) | |
6 | 5 | halfcld 12509 | . 2 ⊢ (𝑋 ∈ ℂ → ((𝑋 − 1) / 2) ∈ ℂ) |
7 | 2cnd 12342 | . 2 ⊢ (𝑋 ∈ ℂ → 2 ∈ ℂ) | |
8 | 2ne0 12368 | . . 3 ⊢ 2 ≠ 0 | |
9 | 8 | a1i 11 | . 2 ⊢ (𝑋 ∈ ℂ → 2 ≠ 0) |
10 | 1cnd 11254 | . . . 4 ⊢ (𝑋 ∈ ℂ → 1 ∈ ℂ) | |
11 | 2, 10, 7 | subdird 11718 | . . 3 ⊢ (𝑋 ∈ ℂ → ((((𝑋 + 1) / 2) − 1) · 2) = ((((𝑋 + 1) / 2) · 2) − (1 · 2))) |
12 | 1, 7, 9 | divcan1d 12042 | . . . 4 ⊢ (𝑋 ∈ ℂ → (((𝑋 + 1) / 2) · 2) = (𝑋 + 1)) |
13 | 7 | mullidd 11277 | . . . 4 ⊢ (𝑋 ∈ ℂ → (1 · 2) = 2) |
14 | 12, 13 | oveq12d 7449 | . . 3 ⊢ (𝑋 ∈ ℂ → ((((𝑋 + 1) / 2) · 2) − (1 · 2)) = ((𝑋 + 1) − 2)) |
15 | 5, 7, 9 | divcan1d 12042 | . . . 4 ⊢ (𝑋 ∈ ℂ → (((𝑋 − 1) / 2) · 2) = (𝑋 − 1)) |
16 | 2m1e1 12390 | . . . . . 6 ⊢ (2 − 1) = 1 | |
17 | 16 | a1i 11 | . . . . 5 ⊢ (𝑋 ∈ ℂ → (2 − 1) = 1) |
18 | 17 | oveq2d 7447 | . . . 4 ⊢ (𝑋 ∈ ℂ → (𝑋 − (2 − 1)) = (𝑋 − 1)) |
19 | id 22 | . . . . 5 ⊢ (𝑋 ∈ ℂ → 𝑋 ∈ ℂ) | |
20 | 19, 7, 10 | subsub3d 11648 | . . . 4 ⊢ (𝑋 ∈ ℂ → (𝑋 − (2 − 1)) = ((𝑋 + 1) − 2)) |
21 | 15, 18, 20 | 3eqtr2rd 2782 | . . 3 ⊢ (𝑋 ∈ ℂ → ((𝑋 + 1) − 2) = (((𝑋 − 1) / 2) · 2)) |
22 | 11, 14, 21 | 3eqtrd 2779 | . 2 ⊢ (𝑋 ∈ ℂ → ((((𝑋 + 1) / 2) − 1) · 2) = (((𝑋 − 1) / 2) · 2)) |
23 | 4, 6, 7, 9, 22 | mulcan2ad 11897 | 1 ⊢ (𝑋 ∈ ℂ → (((𝑋 + 1) / 2) − 1) = ((𝑋 − 1) / 2)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 = wceq 1537 ∈ wcel 2106 ≠ wne 2938 (class class class)co 7431 ℂcc 11151 0cc0 11153 1c1 11154 + caddc 11156 · cmul 11158 − cmin 11490 / cdiv 11918 2c2 12319 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1908 ax-6 1965 ax-7 2005 ax-8 2108 ax-9 2116 ax-10 2139 ax-11 2155 ax-12 2175 ax-ext 2706 ax-sep 5302 ax-nul 5312 ax-pow 5371 ax-pr 5438 ax-un 7754 ax-resscn 11210 ax-1cn 11211 ax-icn 11212 ax-addcl 11213 ax-addrcl 11214 ax-mulcl 11215 ax-mulrcl 11216 ax-mulcom 11217 ax-addass 11218 ax-mulass 11219 ax-distr 11220 ax-i2m1 11221 ax-1ne0 11222 ax-1rid 11223 ax-rnegex 11224 ax-rrecex 11225 ax-cnre 11226 ax-pre-lttri 11227 ax-pre-lttrn 11228 ax-pre-ltadd 11229 ax-pre-mulgt0 11230 |
This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1540 df-fal 1550 df-ex 1777 df-nf 1781 df-sb 2063 df-mo 2538 df-eu 2567 df-clab 2713 df-cleq 2727 df-clel 2814 df-nfc 2890 df-ne 2939 df-nel 3045 df-ral 3060 df-rex 3069 df-rmo 3378 df-reu 3379 df-rab 3434 df-v 3480 df-sbc 3792 df-csb 3909 df-dif 3966 df-un 3968 df-in 3970 df-ss 3980 df-nul 4340 df-if 4532 df-pw 4607 df-sn 4632 df-pr 4634 df-op 4638 df-uni 4913 df-br 5149 df-opab 5211 df-mpt 5232 df-id 5583 df-po 5597 df-so 5598 df-xp 5695 df-rel 5696 df-cnv 5697 df-co 5698 df-dm 5699 df-rn 5700 df-res 5701 df-ima 5702 df-iota 6516 df-fun 6565 df-fn 6566 df-f 6567 df-f1 6568 df-fo 6569 df-f1o 6570 df-fv 6571 df-riota 7388 df-ov 7434 df-oprab 7435 df-mpo 7436 df-er 8744 df-en 8985 df-dom 8986 df-sdom 8987 df-pnf 11295 df-mnf 11296 df-xr 11297 df-ltxr 11298 df-le 11299 df-sub 11492 df-neg 11493 df-div 11919 df-2 12327 |
This theorem is referenced by: mod2eq1n2dvds 16381 zob 16393 nno 16416 nn0ob 16418 dignn0flhalflem1 48465 |
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