![]() |
Mathbox for Alexander van der Vekens |
< Previous
Next >
Nearby theorems |
|
Mirrors > Home > MPE Home > Th. List > Mathboxes > nn0enn0exALTV | Structured version Visualization version GIF version |
Description: For each even nonnegative integer there is a nonnegative integer which, multiplied by 2, results in the even nonnegative integer. (Contributed by AV, 30-May-2020.) (Revised by AV, 22-Jun-2020.) |
Ref | Expression |
---|---|
nn0enn0exALTV | ⊢ ((𝑁 ∈ ℕ0 ∧ 𝑁 ∈ Even ) → ∃𝑚 ∈ ℕ0 𝑁 = (2 · 𝑚)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nn0e 47174 | . 2 ⊢ ((𝑁 ∈ ℕ0 ∧ 𝑁 ∈ Even ) → (𝑁 / 2) ∈ ℕ0) | |
2 | oveq2 7427 | . . . 4 ⊢ (𝑚 = (𝑁 / 2) → (2 · 𝑚) = (2 · (𝑁 / 2))) | |
3 | 2 | eqeq2d 2736 | . . 3 ⊢ (𝑚 = (𝑁 / 2) → (𝑁 = (2 · 𝑚) ↔ 𝑁 = (2 · (𝑁 / 2)))) |
4 | 3 | adantl 480 | . 2 ⊢ (((𝑁 ∈ ℕ0 ∧ 𝑁 ∈ Even ) ∧ 𝑚 = (𝑁 / 2)) → (𝑁 = (2 · 𝑚) ↔ 𝑁 = (2 · (𝑁 / 2)))) |
5 | nn0cn 12515 | . . . 4 ⊢ (𝑁 ∈ ℕ0 → 𝑁 ∈ ℂ) | |
6 | 2cnd 12323 | . . . 4 ⊢ (𝑁 ∈ ℕ0 → 2 ∈ ℂ) | |
7 | 2ne0 12349 | . . . . 5 ⊢ 2 ≠ 0 | |
8 | 7 | a1i 11 | . . . 4 ⊢ (𝑁 ∈ ℕ0 → 2 ≠ 0) |
9 | divcan2 11913 | . . . . 5 ⊢ ((𝑁 ∈ ℂ ∧ 2 ∈ ℂ ∧ 2 ≠ 0) → (2 · (𝑁 / 2)) = 𝑁) | |
10 | 9 | eqcomd 2731 | . . . 4 ⊢ ((𝑁 ∈ ℂ ∧ 2 ∈ ℂ ∧ 2 ≠ 0) → 𝑁 = (2 · (𝑁 / 2))) |
11 | 5, 6, 8, 10 | syl3anc 1368 | . . 3 ⊢ (𝑁 ∈ ℕ0 → 𝑁 = (2 · (𝑁 / 2))) |
12 | 11 | adantr 479 | . 2 ⊢ ((𝑁 ∈ ℕ0 ∧ 𝑁 ∈ Even ) → 𝑁 = (2 · (𝑁 / 2))) |
13 | 1, 4, 12 | rspcedvd 3608 | 1 ⊢ ((𝑁 ∈ ℕ0 ∧ 𝑁 ∈ Even ) → ∃𝑚 ∈ ℕ0 𝑁 = (2 · 𝑚)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 205 ∧ wa 394 ∧ w3a 1084 = wceq 1533 ∈ wcel 2098 ≠ wne 2929 ∃wrex 3059 (class class class)co 7419 ℂcc 11138 0cc0 11140 · cmul 11145 / cdiv 11903 2c2 12300 ℕ0cn0 12505 Even ceven 47101 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1789 ax-4 1803 ax-5 1905 ax-6 1963 ax-7 2003 ax-8 2100 ax-9 2108 ax-10 2129 ax-11 2146 ax-12 2166 ax-ext 2696 ax-sep 5300 ax-nul 5307 ax-pow 5365 ax-pr 5429 ax-un 7741 ax-resscn 11197 ax-1cn 11198 ax-icn 11199 ax-addcl 11200 ax-addrcl 11201 ax-mulcl 11202 ax-mulrcl 11203 ax-mulcom 11204 ax-addass 11205 ax-mulass 11206 ax-distr 11207 ax-i2m1 11208 ax-1ne0 11209 ax-1rid 11210 ax-rnegex 11211 ax-rrecex 11212 ax-cnre 11213 ax-pre-lttri 11214 ax-pre-lttrn 11215 ax-pre-ltadd 11216 ax-pre-mulgt0 11217 |
This theorem depends on definitions: df-bi 206 df-an 395 df-or 846 df-3or 1085 df-3an 1086 df-tru 1536 df-fal 1546 df-ex 1774 df-nf 1778 df-sb 2060 df-mo 2528 df-eu 2557 df-clab 2703 df-cleq 2717 df-clel 2802 df-nfc 2877 df-ne 2930 df-nel 3036 df-ral 3051 df-rex 3060 df-rmo 3363 df-reu 3364 df-rab 3419 df-v 3463 df-sbc 3774 df-csb 3890 df-dif 3947 df-un 3949 df-in 3951 df-ss 3961 df-pss 3964 df-nul 4323 df-if 4531 df-pw 4606 df-sn 4631 df-pr 4633 df-op 4637 df-uni 4910 df-iun 4999 df-br 5150 df-opab 5212 df-mpt 5233 df-tr 5267 df-id 5576 df-eprel 5582 df-po 5590 df-so 5591 df-fr 5633 df-we 5635 df-xp 5684 df-rel 5685 df-cnv 5686 df-co 5687 df-dm 5688 df-rn 5689 df-res 5690 df-ima 5691 df-pred 6307 df-ord 6374 df-on 6375 df-lim 6376 df-suc 6377 df-iota 6501 df-fun 6551 df-fn 6552 df-f 6553 df-f1 6554 df-fo 6555 df-f1o 6556 df-fv 6557 df-riota 7375 df-ov 7422 df-oprab 7423 df-mpo 7424 df-om 7872 df-2nd 7995 df-frecs 8287 df-wrecs 8318 df-recs 8392 df-rdg 8431 df-er 8725 df-en 8965 df-dom 8966 df-sdom 8967 df-pnf 11282 df-mnf 11283 df-xr 11284 df-ltxr 11285 df-le 11286 df-sub 11478 df-neg 11479 df-div 11904 df-nn 12246 df-2 12308 df-n0 12506 df-z 12592 df-even 47103 |
This theorem is referenced by: (None) |
Copyright terms: Public domain | W3C validator |