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Mirrors > Home > ILE Home > Th. List > oddp1even | GIF version |
Description: An integer is odd iff its successor is even. (Contributed by Mario Carneiro, 5-Sep-2016.) |
Ref | Expression |
---|---|
oddp1even | ⊢ (𝑁 ∈ ℤ → (¬ 2 ∥ 𝑁 ↔ 2 ∥ (𝑁 + 1))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | oddm1even 12016 | . 2 ⊢ (𝑁 ∈ ℤ → (¬ 2 ∥ 𝑁 ↔ 2 ∥ (𝑁 − 1))) | |
2 | 2z 9345 | . . 3 ⊢ 2 ∈ ℤ | |
3 | peano2zm 9355 | . . 3 ⊢ (𝑁 ∈ ℤ → (𝑁 − 1) ∈ ℤ) | |
4 | dvdsadd 11979 | . . 3 ⊢ ((2 ∈ ℤ ∧ (𝑁 − 1) ∈ ℤ) → (2 ∥ (𝑁 − 1) ↔ 2 ∥ (2 + (𝑁 − 1)))) | |
5 | 2, 3, 4 | sylancr 414 | . 2 ⊢ (𝑁 ∈ ℤ → (2 ∥ (𝑁 − 1) ↔ 2 ∥ (2 + (𝑁 − 1)))) |
6 | 2cnd 9055 | . . . . 5 ⊢ (𝑁 ∈ ℤ → 2 ∈ ℂ) | |
7 | zcn 9322 | . . . . 5 ⊢ (𝑁 ∈ ℤ → 𝑁 ∈ ℂ) | |
8 | 1cnd 8035 | . . . . 5 ⊢ (𝑁 ∈ ℤ → 1 ∈ ℂ) | |
9 | 6, 7, 8 | addsub12d 8353 | . . . 4 ⊢ (𝑁 ∈ ℤ → (2 + (𝑁 − 1)) = (𝑁 + (2 − 1))) |
10 | 2m1e1 9100 | . . . . 5 ⊢ (2 − 1) = 1 | |
11 | 10 | oveq2i 5929 | . . . 4 ⊢ (𝑁 + (2 − 1)) = (𝑁 + 1) |
12 | 9, 11 | eqtrdi 2242 | . . 3 ⊢ (𝑁 ∈ ℤ → (2 + (𝑁 − 1)) = (𝑁 + 1)) |
13 | 12 | breq2d 4041 | . 2 ⊢ (𝑁 ∈ ℤ → (2 ∥ (2 + (𝑁 − 1)) ↔ 2 ∥ (𝑁 + 1))) |
14 | 1, 5, 13 | 3bitrd 214 | 1 ⊢ (𝑁 ∈ ℤ → (¬ 2 ∥ 𝑁 ↔ 2 ∥ (𝑁 + 1))) |
Colors of variables: wff set class |
Syntax hints: ¬ wn 3 → wi 4 ↔ wb 105 ∈ wcel 2164 class class class wbr 4029 (class class class)co 5918 1c1 7873 + caddc 7875 − cmin 8190 2c2 9033 ℤcz 9317 ∥ cdvds 11930 |
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 710 ax-5 1458 ax-7 1459 ax-gen 1460 ax-ie1 1504 ax-ie2 1505 ax-8 1515 ax-10 1516 ax-11 1517 ax-i12 1518 ax-bndl 1520 ax-4 1521 ax-17 1537 ax-i9 1541 ax-ial 1545 ax-i5r 1546 ax-13 2166 ax-14 2167 ax-ext 2175 ax-sep 4147 ax-pow 4203 ax-pr 4238 ax-un 4464 ax-setind 4569 ax-cnex 7963 ax-resscn 7964 ax-1cn 7965 ax-1re 7966 ax-icn 7967 ax-addcl 7968 ax-addrcl 7969 ax-mulcl 7970 ax-mulrcl 7971 ax-addcom 7972 ax-mulcom 7973 ax-addass 7974 ax-mulass 7975 ax-distr 7976 ax-i2m1 7977 ax-0lt1 7978 ax-1rid 7979 ax-0id 7980 ax-rnegex 7981 ax-precex 7982 ax-cnre 7983 ax-pre-ltirr 7984 ax-pre-ltwlin 7985 ax-pre-lttrn 7986 ax-pre-apti 7987 ax-pre-ltadd 7988 ax-pre-mulgt0 7989 ax-pre-mulext 7990 |
This theorem depends on definitions: df-bi 117 df-3or 981 df-3an 982 df-tru 1367 df-fal 1370 df-xor 1387 df-nf 1472 df-sb 1774 df-eu 2045 df-mo 2046 df-clab 2180 df-cleq 2186 df-clel 2189 df-nfc 2325 df-ne 2365 df-nel 2460 df-ral 2477 df-rex 2478 df-reu 2479 df-rmo 2480 df-rab 2481 df-v 2762 df-sbc 2986 df-dif 3155 df-un 3157 df-in 3159 df-ss 3166 df-pw 3603 df-sn 3624 df-pr 3625 df-op 3627 df-uni 3836 df-int 3871 df-br 4030 df-opab 4091 df-id 4324 df-po 4327 df-iso 4328 df-xp 4665 df-rel 4666 df-cnv 4667 df-co 4668 df-dm 4669 df-iota 5215 df-fun 5256 df-fv 5262 df-riota 5873 df-ov 5921 df-oprab 5922 df-mpo 5923 df-pnf 8056 df-mnf 8057 df-xr 8058 df-ltxr 8059 df-le 8060 df-sub 8192 df-neg 8193 df-reap 8594 df-ap 8601 df-div 8692 df-inn 8983 df-2 9041 df-n0 9241 df-z 9318 df-dvds 11931 |
This theorem is referenced by: zeo5 12029 oddp1d2 12031 n2dvdsm1 12054 2sqpwodd 12314 oddennn 12549 |
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