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Mirrors > Home > MPE Home > Th. List > subhalfhalf | Structured version Visualization version GIF version |
Description: Subtracting the half of a number from the number yields the half of the number. (Contributed by AV, 28-Jun-2021.) |
Ref | Expression |
---|---|
subhalfhalf | ⊢ (𝐴 ∈ ℂ → (𝐴 − (𝐴 / 2)) = (𝐴 / 2)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | id 22 | . . . . 5 ⊢ (𝐴 ∈ ℂ → 𝐴 ∈ ℂ) | |
2 | 2cnd 11718 | . . . . 5 ⊢ (𝐴 ∈ ℂ → 2 ∈ ℂ) | |
3 | 2ne0 11744 | . . . . . 6 ⊢ 2 ≠ 0 | |
4 | 3 | a1i 11 | . . . . 5 ⊢ (𝐴 ∈ ℂ → 2 ≠ 0) |
5 | 1, 2, 4 | divcan1d 11419 | . . . 4 ⊢ (𝐴 ∈ ℂ → ((𝐴 / 2) · 2) = 𝐴) |
6 | 5 | eqcomd 2829 | . . 3 ⊢ (𝐴 ∈ ℂ → 𝐴 = ((𝐴 / 2) · 2)) |
7 | 6 | oveq1d 7173 | . 2 ⊢ (𝐴 ∈ ℂ → (𝐴 − (𝐴 / 2)) = (((𝐴 / 2) · 2) − (𝐴 / 2))) |
8 | halfcl 11865 | . . . 4 ⊢ (𝐴 ∈ ℂ → (𝐴 / 2) ∈ ℂ) | |
9 | 8, 2 | mulcomd 10664 | . . 3 ⊢ (𝐴 ∈ ℂ → ((𝐴 / 2) · 2) = (2 · (𝐴 / 2))) |
10 | 9 | oveq1d 7173 | . 2 ⊢ (𝐴 ∈ ℂ → (((𝐴 / 2) · 2) − (𝐴 / 2)) = ((2 · (𝐴 / 2)) − (𝐴 / 2))) |
11 | 2, 8 | mulsubfacd 11103 | . . 3 ⊢ (𝐴 ∈ ℂ → ((2 · (𝐴 / 2)) − (𝐴 / 2)) = ((2 − 1) · (𝐴 / 2))) |
12 | 2m1e1 11766 | . . . . 5 ⊢ (2 − 1) = 1 | |
13 | 12 | a1i 11 | . . . 4 ⊢ (𝐴 ∈ ℂ → (2 − 1) = 1) |
14 | 13 | oveq1d 7173 | . . 3 ⊢ (𝐴 ∈ ℂ → ((2 − 1) · (𝐴 / 2)) = (1 · (𝐴 / 2))) |
15 | 8 | mulid2d 10661 | . . 3 ⊢ (𝐴 ∈ ℂ → (1 · (𝐴 / 2)) = (𝐴 / 2)) |
16 | 11, 14, 15 | 3eqtrd 2862 | . 2 ⊢ (𝐴 ∈ ℂ → ((2 · (𝐴 / 2)) − (𝐴 / 2)) = (𝐴 / 2)) |
17 | 7, 10, 16 | 3eqtrd 2862 | 1 ⊢ (𝐴 ∈ ℂ → (𝐴 − (𝐴 / 2)) = (𝐴 / 2)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 = wceq 1537 ∈ wcel 2114 ≠ wne 3018 (class class class)co 7158 ℂcc 10537 0cc0 10539 1c1 10540 · cmul 10544 − cmin 10872 / cdiv 11299 2c2 11695 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2795 ax-sep 5205 ax-nul 5212 ax-pow 5268 ax-pr 5332 ax-un 7463 ax-resscn 10596 ax-1cn 10597 ax-icn 10598 ax-addcl 10599 ax-addrcl 10600 ax-mulcl 10601 ax-mulrcl 10602 ax-mulcom 10603 ax-addass 10604 ax-mulass 10605 ax-distr 10606 ax-i2m1 10607 ax-1ne0 10608 ax-1rid 10609 ax-rnegex 10610 ax-rrecex 10611 ax-cnre 10612 ax-pre-lttri 10613 ax-pre-lttrn 10614 ax-pre-ltadd 10615 ax-pre-mulgt0 10616 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-mo 2622 df-eu 2654 df-clab 2802 df-cleq 2816 df-clel 2895 df-nfc 2965 df-ne 3019 df-nel 3126 df-ral 3145 df-rex 3146 df-reu 3147 df-rmo 3148 df-rab 3149 df-v 3498 df-sbc 3775 df-csb 3886 df-dif 3941 df-un 3943 df-in 3945 df-ss 3954 df-nul 4294 df-if 4470 df-pw 4543 df-sn 4570 df-pr 4572 df-op 4576 df-uni 4841 df-br 5069 df-opab 5131 df-mpt 5149 df-id 5462 df-po 5476 df-so 5477 df-xp 5563 df-rel 5564 df-cnv 5565 df-co 5566 df-dm 5567 df-rn 5568 df-res 5569 df-ima 5570 df-iota 6316 df-fun 6359 df-fn 6360 df-f 6361 df-f1 6362 df-fo 6363 df-f1o 6364 df-fv 6365 df-riota 7116 df-ov 7161 df-oprab 7162 df-mpo 7163 df-er 8291 df-en 8512 df-dom 8513 df-sdom 8514 df-pnf 10679 df-mnf 10680 df-xr 10681 df-ltxr 10682 df-le 10683 df-sub 10874 df-neg 10875 df-div 11300 df-2 11703 |
This theorem is referenced by: fldiv4lem1div2uz2 13209 gausslemma2dlem1a 25943 |
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