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Mirrors > Home > MPE Home > Th. List > Mathboxes > oddp1evenALTV | Structured version Visualization version GIF version |
Description: An integer is odd iff its successor is even. (Contributed by Mario Carneiro, 5-Sep-2016.) (Revised by AV, 19-Jun-2020.) |
Ref | Expression |
---|---|
oddp1evenALTV | ⊢ (𝑁 ∈ ℤ → (𝑁 ∈ Odd ↔ (𝑁 + 1) ∈ Even )) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | isodd 45038 | . . . 4 ⊢ (𝑁 ∈ Odd ↔ (𝑁 ∈ ℤ ∧ ((𝑁 + 1) / 2) ∈ ℤ)) | |
2 | 1 | baib 536 | . . 3 ⊢ (𝑁 ∈ ℤ → (𝑁 ∈ Odd ↔ ((𝑁 + 1) / 2) ∈ ℤ)) |
3 | peano2z 12350 | . . . 4 ⊢ (𝑁 ∈ ℤ → (𝑁 + 1) ∈ ℤ) | |
4 | 3 | biantrurd 533 | . . 3 ⊢ (𝑁 ∈ ℤ → (((𝑁 + 1) / 2) ∈ ℤ ↔ ((𝑁 + 1) ∈ ℤ ∧ ((𝑁 + 1) / 2) ∈ ℤ))) |
5 | 2, 4 | bitrd 278 | . 2 ⊢ (𝑁 ∈ ℤ → (𝑁 ∈ Odd ↔ ((𝑁 + 1) ∈ ℤ ∧ ((𝑁 + 1) / 2) ∈ ℤ))) |
6 | iseven 45037 | . 2 ⊢ ((𝑁 + 1) ∈ Even ↔ ((𝑁 + 1) ∈ ℤ ∧ ((𝑁 + 1) / 2) ∈ ℤ)) | |
7 | 5, 6 | bitr4di 289 | 1 ⊢ (𝑁 ∈ ℤ → (𝑁 ∈ Odd ↔ (𝑁 + 1) ∈ Even )) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 205 ∧ wa 396 ∈ wcel 2106 (class class class)co 7269 1c1 10861 + caddc 10863 / cdiv 11621 2c2 12017 ℤcz 12308 Even ceven 45033 Odd codd 45034 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 ax-5 1913 ax-6 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-10 2137 ax-11 2154 ax-12 2171 ax-ext 2709 ax-sep 5223 ax-nul 5230 ax-pow 5288 ax-pr 5352 ax-un 7580 ax-resscn 10917 ax-1cn 10918 ax-icn 10919 ax-addcl 10920 ax-addrcl 10921 ax-mulcl 10922 ax-mulrcl 10923 ax-mulcom 10924 ax-addass 10925 ax-mulass 10926 ax-distr 10927 ax-i2m1 10928 ax-1ne0 10929 ax-1rid 10930 ax-rnegex 10931 ax-rrecex 10932 ax-cnre 10933 ax-pre-lttri 10934 ax-pre-lttrn 10935 ax-pre-ltadd 10936 ax-pre-mulgt0 10937 |
This theorem depends on definitions: df-bi 206 df-an 397 df-or 845 df-3or 1087 df-3an 1088 df-tru 1542 df-fal 1552 df-ex 1783 df-nf 1787 df-sb 2068 df-mo 2540 df-eu 2569 df-clab 2716 df-cleq 2730 df-clel 2816 df-nfc 2889 df-ne 2944 df-nel 3050 df-ral 3069 df-rex 3070 df-reu 3072 df-rab 3073 df-v 3433 df-sbc 3718 df-csb 3834 df-dif 3891 df-un 3893 df-in 3895 df-ss 3905 df-pss 3907 df-nul 4259 df-if 4462 df-pw 4537 df-sn 4564 df-pr 4566 df-op 4570 df-uni 4842 df-iun 4928 df-br 5076 df-opab 5138 df-mpt 5159 df-tr 5193 df-id 5486 df-eprel 5492 df-po 5500 df-so 5501 df-fr 5541 df-we 5543 df-xp 5592 df-rel 5593 df-cnv 5594 df-co 5595 df-dm 5596 df-rn 5597 df-res 5598 df-ima 5599 df-pred 6197 df-ord 6264 df-on 6265 df-lim 6266 df-suc 6267 df-iota 6386 df-fun 6430 df-fn 6431 df-f 6432 df-f1 6433 df-fo 6434 df-f1o 6435 df-fv 6436 df-riota 7226 df-ov 7272 df-oprab 7273 df-mpo 7274 df-om 7705 df-2nd 7823 df-frecs 8086 df-wrecs 8117 df-recs 8191 df-rdg 8230 df-er 8487 df-en 8723 df-dom 8724 df-sdom 8725 df-pnf 11000 df-mnf 11001 df-xr 11002 df-ltxr 11003 df-le 11004 df-sub 11196 df-neg 11197 df-nn 11963 df-n0 12223 df-z 12309 df-even 45035 df-odd 45036 |
This theorem is referenced by: (None) |
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