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Mirrors > Home > ILE Home > Th. List > n2dvdsm1 | GIF version |
Description: 2 does not divide -1. That means -1 is odd. (Contributed by AV, 15-Aug-2021.) |
Ref | Expression |
---|---|
n2dvdsm1 | ⊢ ¬ 2 ∥ -1 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | z0even 11848 | . . 3 ⊢ 2 ∥ 0 | |
2 | ax-1cn 7846 | . . . 4 ⊢ 1 ∈ ℂ | |
3 | neg1cn 8962 | . . . 4 ⊢ -1 ∈ ℂ | |
4 | 1pneg1e0 8968 | . . . 4 ⊢ (1 + -1) = 0 | |
5 | 2, 3, 4 | addcomli 8043 | . . 3 ⊢ (-1 + 1) = 0 |
6 | 1, 5 | breqtrri 4009 | . 2 ⊢ 2 ∥ (-1 + 1) |
7 | neg1z 9223 | . . 3 ⊢ -1 ∈ ℤ | |
8 | oddp1even 11813 | . . 3 ⊢ (-1 ∈ ℤ → (¬ 2 ∥ -1 ↔ 2 ∥ (-1 + 1))) | |
9 | 7, 8 | ax-mp 5 | . 2 ⊢ (¬ 2 ∥ -1 ↔ 2 ∥ (-1 + 1)) |
10 | 6, 9 | mpbir 145 | 1 ⊢ ¬ 2 ∥ -1 |
Colors of variables: wff set class |
Syntax hints: ¬ wn 3 ↔ wb 104 ∈ wcel 2136 class class class wbr 3982 (class class class)co 5842 0cc0 7753 1c1 7754 + caddc 7756 -cneg 8070 2c2 8908 ℤcz 9191 ∥ cdvds 11727 |
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 1435 ax-7 1436 ax-gen 1437 ax-ie1 1481 ax-ie2 1482 ax-8 1492 ax-10 1493 ax-11 1494 ax-i12 1495 ax-bndl 1497 ax-4 1498 ax-17 1514 ax-i9 1518 ax-ial 1522 ax-i5r 1523 ax-13 2138 ax-14 2139 ax-ext 2147 ax-sep 4100 ax-pow 4153 ax-pr 4187 ax-un 4411 ax-setind 4514 ax-cnex 7844 ax-resscn 7845 ax-1cn 7846 ax-1re 7847 ax-icn 7848 ax-addcl 7849 ax-addrcl 7850 ax-mulcl 7851 ax-mulrcl 7852 ax-addcom 7853 ax-mulcom 7854 ax-addass 7855 ax-mulass 7856 ax-distr 7857 ax-i2m1 7858 ax-0lt1 7859 ax-1rid 7860 ax-0id 7861 ax-rnegex 7862 ax-precex 7863 ax-cnre 7864 ax-pre-ltirr 7865 ax-pre-ltwlin 7866 ax-pre-lttrn 7867 ax-pre-apti 7868 ax-pre-ltadd 7869 ax-pre-mulgt0 7870 ax-pre-mulext 7871 |
This theorem depends on definitions: df-bi 116 df-3or 969 df-3an 970 df-tru 1346 df-fal 1349 df-xor 1366 df-nf 1449 df-sb 1751 df-eu 2017 df-mo 2018 df-clab 2152 df-cleq 2158 df-clel 2161 df-nfc 2297 df-ne 2337 df-nel 2432 df-ral 2449 df-rex 2450 df-reu 2451 df-rmo 2452 df-rab 2453 df-v 2728 df-sbc 2952 df-dif 3118 df-un 3120 df-in 3122 df-ss 3129 df-pw 3561 df-sn 3582 df-pr 3583 df-op 3585 df-uni 3790 df-int 3825 df-br 3983 df-opab 4044 df-id 4271 df-po 4274 df-iso 4275 df-xp 4610 df-rel 4611 df-cnv 4612 df-co 4613 df-dm 4614 df-iota 5153 df-fun 5190 df-fv 5196 df-riota 5798 df-ov 5845 df-oprab 5846 df-mpo 5847 df-pnf 7935 df-mnf 7936 df-xr 7937 df-ltxr 7938 df-le 7939 df-sub 8071 df-neg 8072 df-reap 8473 df-ap 8480 df-div 8569 df-inn 8858 df-2 8916 df-n0 9115 df-z 9192 df-dvds 11728 |
This theorem is referenced by: (None) |
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