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| Mirrors > Home > ILE Home > Th. List > zeo3 | GIF version | ||
| Description: An integer is even or odd. (Contributed by AV, 17-Jun-2021.) |
| Ref | Expression |
|---|---|
| zeo3 | ⊢ (𝑁 ∈ ℤ → (2 ∥ 𝑁 ∨ ¬ 2 ∥ 𝑁)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | peano2zm 9445 | . . . 4 ⊢ (𝑁 ∈ ℤ → (𝑁 − 1) ∈ ℤ) | |
| 2 | zeo 9513 | . . . 4 ⊢ ((𝑁 − 1) ∈ ℤ → (((𝑁 − 1) / 2) ∈ ℤ ∨ (((𝑁 − 1) + 1) / 2) ∈ ℤ)) | |
| 3 | 1, 2 | syl 14 | . . 3 ⊢ (𝑁 ∈ ℤ → (((𝑁 − 1) / 2) ∈ ℤ ∨ (((𝑁 − 1) + 1) / 2) ∈ ℤ)) |
| 4 | zeo2 9514 | . . . . . 6 ⊢ ((𝑁 − 1) ∈ ℤ → (((𝑁 − 1) / 2) ∈ ℤ ↔ ¬ (((𝑁 − 1) + 1) / 2) ∈ ℤ)) | |
| 5 | 1, 4 | syl 14 | . . . . 5 ⊢ (𝑁 ∈ ℤ → (((𝑁 − 1) / 2) ∈ ℤ ↔ ¬ (((𝑁 − 1) + 1) / 2) ∈ ℤ)) |
| 6 | zcn 9412 | . . . . . . . . . 10 ⊢ (𝑁 ∈ ℤ → 𝑁 ∈ ℂ) | |
| 7 | 1cnd 8123 | . . . . . . . . . 10 ⊢ (𝑁 ∈ ℤ → 1 ∈ ℂ) | |
| 8 | 6, 7 | npcand 8422 | . . . . . . . . 9 ⊢ (𝑁 ∈ ℤ → ((𝑁 − 1) + 1) = 𝑁) |
| 9 | 8 | oveq1d 5982 | . . . . . . . 8 ⊢ (𝑁 ∈ ℤ → (((𝑁 − 1) + 1) / 2) = (𝑁 / 2)) |
| 10 | 9 | eleq1d 2276 | . . . . . . 7 ⊢ (𝑁 ∈ ℤ → ((((𝑁 − 1) + 1) / 2) ∈ ℤ ↔ (𝑁 / 2) ∈ ℤ)) |
| 11 | 2z 9435 | . . . . . . . 8 ⊢ 2 ∈ ℤ | |
| 12 | 2ne0 9163 | . . . . . . . 8 ⊢ 2 ≠ 0 | |
| 13 | dvdsval2 12216 | . . . . . . . 8 ⊢ ((2 ∈ ℤ ∧ 2 ≠ 0 ∧ 𝑁 ∈ ℤ) → (2 ∥ 𝑁 ↔ (𝑁 / 2) ∈ ℤ)) | |
| 14 | 11, 12, 13 | mp3an12 1340 | . . . . . . 7 ⊢ (𝑁 ∈ ℤ → (2 ∥ 𝑁 ↔ (𝑁 / 2) ∈ ℤ)) |
| 15 | 10, 14 | bitr4d 191 | . . . . . 6 ⊢ (𝑁 ∈ ℤ → ((((𝑁 − 1) + 1) / 2) ∈ ℤ ↔ 2 ∥ 𝑁)) |
| 16 | 15 | notbid 669 | . . . . 5 ⊢ (𝑁 ∈ ℤ → (¬ (((𝑁 − 1) + 1) / 2) ∈ ℤ ↔ ¬ 2 ∥ 𝑁)) |
| 17 | 5, 16 | bitrd 188 | . . . 4 ⊢ (𝑁 ∈ ℤ → (((𝑁 − 1) / 2) ∈ ℤ ↔ ¬ 2 ∥ 𝑁)) |
| 18 | 17, 15 | orbi12d 795 | . . 3 ⊢ (𝑁 ∈ ℤ → ((((𝑁 − 1) / 2) ∈ ℤ ∨ (((𝑁 − 1) + 1) / 2) ∈ ℤ) ↔ (¬ 2 ∥ 𝑁 ∨ 2 ∥ 𝑁))) |
| 19 | 3, 18 | mpbid 147 | . 2 ⊢ (𝑁 ∈ ℤ → (¬ 2 ∥ 𝑁 ∨ 2 ∥ 𝑁)) |
| 20 | 19 | orcomd 731 | 1 ⊢ (𝑁 ∈ ℤ → (2 ∥ 𝑁 ∨ ¬ 2 ∥ 𝑁)) |
| Colors of variables: wff set class |
| Syntax hints: ¬ wn 3 → wi 4 ↔ wb 105 ∨ wo 710 ∈ wcel 2178 ≠ wne 2378 class class class wbr 4059 (class class class)co 5967 0cc0 7960 1c1 7961 + caddc 7963 − cmin 8278 / cdiv 8780 2c2 9122 ℤcz 9407 ∥ cdvds 12213 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 615 ax-in2 616 ax-io 711 ax-5 1471 ax-7 1472 ax-gen 1473 ax-ie1 1517 ax-ie2 1518 ax-8 1528 ax-10 1529 ax-11 1530 ax-i12 1531 ax-bndl 1533 ax-4 1534 ax-17 1550 ax-i9 1554 ax-ial 1558 ax-i5r 1559 ax-13 2180 ax-14 2181 ax-ext 2189 ax-sep 4178 ax-pow 4234 ax-pr 4269 ax-un 4498 ax-setind 4603 ax-cnex 8051 ax-resscn 8052 ax-1cn 8053 ax-1re 8054 ax-icn 8055 ax-addcl 8056 ax-addrcl 8057 ax-mulcl 8058 ax-mulrcl 8059 ax-addcom 8060 ax-mulcom 8061 ax-addass 8062 ax-mulass 8063 ax-distr 8064 ax-i2m1 8065 ax-0lt1 8066 ax-1rid 8067 ax-0id 8068 ax-rnegex 8069 ax-precex 8070 ax-cnre 8071 ax-pre-ltirr 8072 ax-pre-ltwlin 8073 ax-pre-lttrn 8074 ax-pre-apti 8075 ax-pre-ltadd 8076 ax-pre-mulgt0 8077 ax-pre-mulext 8078 |
| This theorem depends on definitions: df-bi 117 df-3or 982 df-3an 983 df-tru 1376 df-fal 1379 df-nf 1485 df-sb 1787 df-eu 2058 df-mo 2059 df-clab 2194 df-cleq 2200 df-clel 2203 df-nfc 2339 df-ne 2379 df-nel 2474 df-ral 2491 df-rex 2492 df-reu 2493 df-rmo 2494 df-rab 2495 df-v 2778 df-sbc 3006 df-dif 3176 df-un 3178 df-in 3180 df-ss 3187 df-pw 3628 df-sn 3649 df-pr 3650 df-op 3652 df-uni 3865 df-int 3900 df-br 4060 df-opab 4122 df-id 4358 df-po 4361 df-iso 4362 df-xp 4699 df-rel 4700 df-cnv 4701 df-co 4702 df-dm 4703 df-iota 5251 df-fun 5292 df-fv 5298 df-riota 5922 df-ov 5970 df-oprab 5971 df-mpo 5972 df-pnf 8144 df-mnf 8145 df-xr 8146 df-ltxr 8147 df-le 8148 df-sub 8280 df-neg 8281 df-reap 8683 df-ap 8690 df-div 8781 df-inn 9072 df-2 9130 df-n0 9331 df-z 9408 df-dvds 12214 |
| This theorem is referenced by: zeoxor 12295 zeo5 12314 m1exp1 12327 flodddiv4 12362 2lgslem1c 15682 |
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