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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 12019 | . 2 ⊢ (𝑁 ∈ ℤ → (¬ 2 ∥ 𝑁 ↔ 2 ∥ (𝑁 − 1))) | |
2 | 2z 9348 | . . 3 ⊢ 2 ∈ ℤ | |
3 | peano2zm 9358 | . . 3 ⊢ (𝑁 ∈ ℤ → (𝑁 − 1) ∈ ℤ) | |
4 | dvdsadd 11982 | . . 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 9057 | . . . . 5 ⊢ (𝑁 ∈ ℤ → 2 ∈ ℂ) | |
7 | zcn 9325 | . . . . 5 ⊢ (𝑁 ∈ ℤ → 𝑁 ∈ ℂ) | |
8 | 1cnd 8037 | . . . . 5 ⊢ (𝑁 ∈ ℤ → 1 ∈ ℂ) | |
9 | 6, 7, 8 | addsub12d 8355 | . . . 4 ⊢ (𝑁 ∈ ℤ → (2 + (𝑁 − 1)) = (𝑁 + (2 − 1))) |
10 | 2m1e1 9102 | . . . . 5 ⊢ (2 − 1) = 1 | |
11 | 10 | oveq2i 5930 | . . . 4 ⊢ (𝑁 + (2 − 1)) = (𝑁 + 1) |
12 | 9, 11 | eqtrdi 2242 | . . 3 ⊢ (𝑁 ∈ ℤ → (2 + (𝑁 − 1)) = (𝑁 + 1)) |
13 | 12 | breq2d 4042 | . 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 4030 (class class class)co 5919 1c1 7875 + caddc 7877 − cmin 8192 2c2 9035 ℤcz 9320 ∥ cdvds 11933 |
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 4148 ax-pow 4204 ax-pr 4239 ax-un 4465 ax-setind 4570 ax-cnex 7965 ax-resscn 7966 ax-1cn 7967 ax-1re 7968 ax-icn 7969 ax-addcl 7970 ax-addrcl 7971 ax-mulcl 7972 ax-mulrcl 7973 ax-addcom 7974 ax-mulcom 7975 ax-addass 7976 ax-mulass 7977 ax-distr 7978 ax-i2m1 7979 ax-0lt1 7980 ax-1rid 7981 ax-0id 7982 ax-rnegex 7983 ax-precex 7984 ax-cnre 7985 ax-pre-ltirr 7986 ax-pre-ltwlin 7987 ax-pre-lttrn 7988 ax-pre-apti 7989 ax-pre-ltadd 7990 ax-pre-mulgt0 7991 ax-pre-mulext 7992 |
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 2987 df-dif 3156 df-un 3158 df-in 3160 df-ss 3167 df-pw 3604 df-sn 3625 df-pr 3626 df-op 3628 df-uni 3837 df-int 3872 df-br 4031 df-opab 4092 df-id 4325 df-po 4328 df-iso 4329 df-xp 4666 df-rel 4667 df-cnv 4668 df-co 4669 df-dm 4670 df-iota 5216 df-fun 5257 df-fv 5263 df-riota 5874 df-ov 5922 df-oprab 5923 df-mpo 5924 df-pnf 8058 df-mnf 8059 df-xr 8060 df-ltxr 8061 df-le 8062 df-sub 8194 df-neg 8195 df-reap 8596 df-ap 8603 df-div 8694 df-inn 8985 df-2 9043 df-n0 9244 df-z 9321 df-dvds 11934 |
This theorem is referenced by: zeo5 12032 oddp1d2 12034 n2dvdsm1 12057 2sqpwodd 12317 oddennn 12552 |
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