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Mirrors > Home > ILE Home > Th. List > 1mhlfehlf | 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 8904 | . . 3 ⊢ 2 ∈ ℂ | |
2 | ax-1cn 7825 | . . 3 ⊢ 1 ∈ ℂ | |
3 | 2ap0 8926 | . . . 4 ⊢ 2 # 0 | |
4 | 1, 3 | pm3.2i 270 | . . 3 ⊢ (2 ∈ ℂ ∧ 2 # 0) |
5 | divsubdirap 8581 | . . 3 ⊢ ((2 ∈ ℂ ∧ 1 ∈ ℂ ∧ (2 ∈ ℂ ∧ 2 # 0)) → ((2 − 1) / 2) = ((2 / 2) − (1 / 2))) | |
6 | 1, 2, 4, 5 | mp3an 1319 | . 2 ⊢ ((2 − 1) / 2) = ((2 / 2) − (1 / 2)) |
7 | 2m1e1 8951 | . . 3 ⊢ (2 − 1) = 1 | |
8 | 7 | oveq1i 5834 | . 2 ⊢ ((2 − 1) / 2) = (1 / 2) |
9 | 2div2e1 8965 | . . 3 ⊢ (2 / 2) = 1 | |
10 | 9 | oveq1i 5834 | . 2 ⊢ ((2 / 2) − (1 / 2)) = (1 − (1 / 2)) |
11 | 6, 8, 10 | 3eqtr3ri 2187 | 1 ⊢ (1 − (1 / 2)) = (1 / 2) |
Colors of variables: wff set class |
Syntax hints: ∧ wa 103 = wceq 1335 ∈ wcel 2128 class class class wbr 3965 (class class class)co 5824 ℂcc 7730 0cc0 7732 1c1 7733 − cmin 8046 # cap 8456 / cdiv 8545 2c2 8884 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 604 ax-in2 605 ax-io 699 ax-5 1427 ax-7 1428 ax-gen 1429 ax-ie1 1473 ax-ie2 1474 ax-8 1484 ax-10 1485 ax-11 1486 ax-i12 1487 ax-bndl 1489 ax-4 1490 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-13 2130 ax-14 2131 ax-ext 2139 ax-sep 4082 ax-pow 4135 ax-pr 4169 ax-un 4393 ax-setind 4496 ax-cnex 7823 ax-resscn 7824 ax-1cn 7825 ax-1re 7826 ax-icn 7827 ax-addcl 7828 ax-addrcl 7829 ax-mulcl 7830 ax-mulrcl 7831 ax-addcom 7832 ax-mulcom 7833 ax-addass 7834 ax-mulass 7835 ax-distr 7836 ax-i2m1 7837 ax-0lt1 7838 ax-1rid 7839 ax-0id 7840 ax-rnegex 7841 ax-precex 7842 ax-cnre 7843 ax-pre-ltirr 7844 ax-pre-ltwlin 7845 ax-pre-lttrn 7846 ax-pre-apti 7847 ax-pre-ltadd 7848 ax-pre-mulgt0 7849 ax-pre-mulext 7850 |
This theorem depends on definitions: df-bi 116 df-3an 965 df-tru 1338 df-fal 1341 df-nf 1441 df-sb 1743 df-eu 2009 df-mo 2010 df-clab 2144 df-cleq 2150 df-clel 2153 df-nfc 2288 df-ne 2328 df-nel 2423 df-ral 2440 df-rex 2441 df-reu 2442 df-rmo 2443 df-rab 2444 df-v 2714 df-sbc 2938 df-dif 3104 df-un 3106 df-in 3108 df-ss 3115 df-pw 3545 df-sn 3566 df-pr 3567 df-op 3569 df-uni 3773 df-br 3966 df-opab 4026 df-id 4253 df-po 4256 df-iso 4257 df-xp 4592 df-rel 4593 df-cnv 4594 df-co 4595 df-dm 4596 df-iota 5135 df-fun 5172 df-fv 5178 df-riota 5780 df-ov 5827 df-oprab 5828 df-mpo 5829 df-pnf 7914 df-mnf 7915 df-xr 7916 df-ltxr 7917 df-le 7918 df-sub 8048 df-neg 8049 df-reap 8450 df-ap 8457 df-div 8546 df-2 8892 |
This theorem is referenced by: geo2sum 11411 geoihalfsum 11419 cos12dec 11664 cvgcmp2nlemabs 13614 trilpolemisumle 13620 |
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