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Mathbox for Alexander van der Vekens |
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Mirrors > Home > MPE Home > Th. List > Mathboxes > nneven | Structured version Visualization version GIF version |
Description: An alternate characterization of an even positive integer. (Contributed by AV, 5-Jun-2023.) |
Ref | Expression |
---|---|
nneven | ⊢ ((𝑁 ∈ ℕ ∧ 𝑁 ∈ Even ) → (𝑁 / 2) ∈ ℕ) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nnre 12168 | . . . 4 ⊢ (𝑁 ∈ ℕ → 𝑁 ∈ ℝ) | |
2 | 2re 12235 | . . . . 5 ⊢ 2 ∈ ℝ | |
3 | 2 | a1i 11 | . . . 4 ⊢ (𝑁 ∈ ℕ → 2 ∈ ℝ) |
4 | nngt0 12192 | . . . 4 ⊢ (𝑁 ∈ ℕ → 0 < 𝑁) | |
5 | 2pos 12264 | . . . . 5 ⊢ 0 < 2 | |
6 | 5 | a1i 11 | . . . 4 ⊢ (𝑁 ∈ ℕ → 0 < 2) |
7 | 1, 3, 4, 6 | divgt0d 12098 | . . 3 ⊢ (𝑁 ∈ ℕ → 0 < (𝑁 / 2)) |
8 | evendiv2z 45914 | . . 3 ⊢ (𝑁 ∈ Even → (𝑁 / 2) ∈ ℤ) | |
9 | 7, 8 | anim12ci 615 | . 2 ⊢ ((𝑁 ∈ ℕ ∧ 𝑁 ∈ Even ) → ((𝑁 / 2) ∈ ℤ ∧ 0 < (𝑁 / 2))) |
10 | elnnz 12517 | . 2 ⊢ ((𝑁 / 2) ∈ ℕ ↔ ((𝑁 / 2) ∈ ℤ ∧ 0 < (𝑁 / 2))) | |
11 | 9, 10 | sylibr 233 | 1 ⊢ ((𝑁 ∈ ℕ ∧ 𝑁 ∈ Even ) → (𝑁 / 2) ∈ ℕ) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 397 ∈ wcel 2107 class class class wbr 5109 (class class class)co 7361 ℝcr 11058 0cc0 11059 < clt 11197 / cdiv 11820 ℕcn 12161 2c2 12216 ℤcz 12507 Even ceven 45906 |
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 1914 ax-6 1972 ax-7 2012 ax-8 2109 ax-9 2117 ax-10 2138 ax-11 2155 ax-12 2172 ax-ext 2704 ax-sep 5260 ax-nul 5267 ax-pow 5324 ax-pr 5388 ax-un 7676 ax-resscn 11116 ax-1cn 11117 ax-icn 11118 ax-addcl 11119 ax-addrcl 11120 ax-mulcl 11121 ax-mulrcl 11122 ax-mulcom 11123 ax-addass 11124 ax-mulass 11125 ax-distr 11126 ax-i2m1 11127 ax-1ne0 11128 ax-1rid 11129 ax-rnegex 11130 ax-rrecex 11131 ax-cnre 11132 ax-pre-lttri 11133 ax-pre-lttrn 11134 ax-pre-ltadd 11135 ax-pre-mulgt0 11136 |
This theorem depends on definitions: df-bi 206 df-an 398 df-or 847 df-3or 1089 df-3an 1090 df-tru 1545 df-fal 1555 df-ex 1783 df-nf 1787 df-sb 2069 df-mo 2535 df-eu 2564 df-clab 2711 df-cleq 2725 df-clel 2811 df-nfc 2886 df-ne 2941 df-nel 3047 df-ral 3062 df-rex 3071 df-rmo 3352 df-reu 3353 df-rab 3407 df-v 3449 df-sbc 3744 df-csb 3860 df-dif 3917 df-un 3919 df-in 3921 df-ss 3931 df-pss 3933 df-nul 4287 df-if 4491 df-pw 4566 df-sn 4591 df-pr 4593 df-op 4597 df-uni 4870 df-iun 4960 df-br 5110 df-opab 5172 df-mpt 5193 df-tr 5227 df-id 5535 df-eprel 5541 df-po 5549 df-so 5550 df-fr 5592 df-we 5594 df-xp 5643 df-rel 5644 df-cnv 5645 df-co 5646 df-dm 5647 df-rn 5648 df-res 5649 df-ima 5650 df-pred 6257 df-ord 6324 df-on 6325 df-lim 6326 df-suc 6327 df-iota 6452 df-fun 6502 df-fn 6503 df-f 6504 df-f1 6505 df-fo 6506 df-f1o 6507 df-fv 6508 df-riota 7317 df-ov 7364 df-oprab 7365 df-mpo 7366 df-om 7807 df-2nd 7926 df-frecs 8216 df-wrecs 8247 df-recs 8321 df-rdg 8360 df-er 8654 df-en 8890 df-dom 8891 df-sdom 8892 df-pnf 11199 df-mnf 11200 df-xr 11201 df-ltxr 11202 df-le 11203 df-sub 11395 df-neg 11396 df-div 11821 df-nn 12162 df-2 12224 df-z 12508 df-even 45908 |
This theorem is referenced by: nnennexALTV 45983 |
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