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Mirrors > Home > MPE Home > Th. List > 1mhlfehlf | Structured version Visualization version GIF version |
Description: Prove that 1 - 1/2 = 1/2. (Contributed by David A. Wheeler, 4-Jan-2017.) |
Ref | Expression |
---|---|
1mhlfehlf | ⊢ (1 − (1 / 2)) = (1 / 2) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 2cn 11706 | . . 3 ⊢ 2 ∈ ℂ | |
2 | ax-1cn 10589 | . . 3 ⊢ 1 ∈ ℂ | |
3 | 2cnne0 11841 | . . 3 ⊢ (2 ∈ ℂ ∧ 2 ≠ 0) | |
4 | divsubdir 11328 | . . 3 ⊢ ((2 ∈ ℂ ∧ 1 ∈ ℂ ∧ (2 ∈ ℂ ∧ 2 ≠ 0)) → ((2 − 1) / 2) = ((2 / 2) − (1 / 2))) | |
5 | 1, 2, 3, 4 | mp3an 1457 | . 2 ⊢ ((2 − 1) / 2) = ((2 / 2) − (1 / 2)) |
6 | 2m1e1 11757 | . . 3 ⊢ (2 − 1) = 1 | |
7 | 6 | oveq1i 7160 | . 2 ⊢ ((2 − 1) / 2) = (1 / 2) |
8 | 2div2e1 11772 | . . 3 ⊢ (2 / 2) = 1 | |
9 | 8 | oveq1i 7160 | . 2 ⊢ ((2 / 2) − (1 / 2)) = (1 − (1 / 2)) |
10 | 5, 7, 9 | 3eqtr3ri 2853 | 1 ⊢ (1 − (1 / 2)) = (1 / 2) |
Colors of variables: wff setvar class |
Syntax hints: ∧ wa 398 = wceq 1533 ∈ wcel 2110 ≠ wne 3016 (class class class)co 7150 ℂcc 10529 0cc0 10531 1c1 10532 − cmin 10864 / cdiv 11291 2c2 11686 |
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 1907 ax-6 1966 ax-7 2011 ax-8 2112 ax-9 2120 ax-10 2141 ax-11 2157 ax-12 2173 ax-ext 2793 ax-sep 5195 ax-nul 5202 ax-pow 5258 ax-pr 5321 ax-un 7455 ax-resscn 10588 ax-1cn 10589 ax-icn 10590 ax-addcl 10591 ax-addrcl 10592 ax-mulcl 10593 ax-mulrcl 10594 ax-mulcom 10595 ax-addass 10596 ax-mulass 10597 ax-distr 10598 ax-i2m1 10599 ax-1ne0 10600 ax-1rid 10601 ax-rnegex 10602 ax-rrecex 10603 ax-cnre 10604 ax-pre-lttri 10605 ax-pre-lttrn 10606 ax-pre-ltadd 10607 ax-pre-mulgt0 10608 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1536 df-ex 1777 df-nf 1781 df-sb 2066 df-mo 2618 df-eu 2650 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ne 3017 df-nel 3124 df-ral 3143 df-rex 3144 df-reu 3145 df-rmo 3146 df-rab 3147 df-v 3496 df-sbc 3772 df-csb 3883 df-dif 3938 df-un 3940 df-in 3942 df-ss 3951 df-nul 4291 df-if 4467 df-pw 4540 df-sn 4561 df-pr 4563 df-op 4567 df-uni 4832 df-br 5059 df-opab 5121 df-mpt 5139 df-id 5454 df-po 5468 df-so 5469 df-xp 5555 df-rel 5556 df-cnv 5557 df-co 5558 df-dm 5559 df-rn 5560 df-res 5561 df-ima 5562 df-iota 6308 df-fun 6351 df-fn 6352 df-f 6353 df-f1 6354 df-fo 6355 df-f1o 6356 df-fv 6357 df-riota 7108 df-ov 7153 df-oprab 7154 df-mpo 7155 df-er 8283 df-en 8504 df-dom 8505 df-sdom 8506 df-pnf 10671 df-mnf 10672 df-xr 10673 df-ltxr 10674 df-le 10675 df-sub 10866 df-neg 10867 df-div 11292 df-2 11694 |
This theorem is referenced by: geo2sum 15223 geoihalfsum 15232 pcoass 23622 aaliou3lem3 24927 ang180lem3 25383 coinflippvt 31737 dnibndlem3 33814 oddfl 41536 dirkertrigeqlem3 42379 |
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