| Mathbox for Alexander van der Vekens |
< Previous
Next >
Nearby theorems |
||
| Mirrors > Home > MPE Home > Th. List > Mathboxes > nn0enn0ex | 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.) |
| Ref | Expression |
|---|---|
| nn0enn0ex | ⊢ ((𝑁 ∈ ℕ0 ∧ (𝑁 / 2) ∈ ℕ0) → ∃𝑚 ∈ ℕ0 𝑁 = (2 · 𝑚)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | simpr 490 | . 2 ⊢ ((𝑁 ∈ ℕ0 ∧ (𝑁 / 2) ∈ ℕ0) → (𝑁 / 2) ∈ ℕ0) | |
| 2 | oveq2 7435 | . . . 4 ⊢ (𝑚 = (𝑁 / 2) → (2 · 𝑚) = (2 · (𝑁 / 2))) | |
| 3 | 2 | adantl 487 | . . 3 ⊢ (((𝑁 ∈ ℕ0 ∧ (𝑁 / 2) ∈ ℕ0) ∧ 𝑚 = (𝑁 / 2)) → (2 · 𝑚) = (2 · (𝑁 / 2))) |
| 4 | 3 | eqeq2d 2774 | . 2 ⊢ (((𝑁 ∈ ℕ0 ∧ (𝑁 / 2) ∈ ℕ0) ∧ 𝑚 = (𝑁 / 2)) → (𝑁 = (2 · 𝑚) ↔ 𝑁 = (2 · (𝑁 / 2)))) |
| 5 | nn0cn 12626 | . . . 4 ⊢ (𝑁 ∈ ℕ0 → 𝑁 ∈ ℂ) | |
| 6 | 2cnd 12431 | . . . 4 ⊢ (𝑁 ∈ ℕ0 → 2 ∈ ℂ) | |
| 7 | 2ne0 12459 | . . . . 5 ⊢ 2 ≠ 0 | |
| 8 | 7 | a1i 11 | . . . 4 ⊢ (𝑁 ∈ ℕ0 → 2 ≠ 0) |
| 9 | divcan2 11992 | . . . . 5 ⊢ ((𝑁 ∈ ℂ ∧ 2 ∈ ℂ ∧ 2 ≠ 0) → (2 · (𝑁 / 2)) = 𝑁) | |
| 10 | 9 | eqcomd 2769 | . . . 4 ⊢ ((𝑁 ∈ ℂ ∧ 2 ∈ ℂ ∧ 2 ≠ 0) → 𝑁 = (2 · (𝑁 / 2))) |
| 11 | 5, 6, 8, 10 | syl3anc 1398 | . . 3 ⊢ (𝑁 ∈ ℕ0 → 𝑁 = (2 · (𝑁 / 2))) |
| 12 | 11 | adantr 486 | . 2 ⊢ ((𝑁 ∈ ℕ0 ∧ (𝑁 / 2) ∈ ℕ0) → 𝑁 = (2 · (𝑁 / 2))) |
| 13 | 1, 4, 12 | rspcedvd 3581 | 1 ⊢ ((𝑁 ∈ ℕ0 ∧ (𝑁 / 2) ∈ ℕ0) → ∃𝑚 ∈ ℕ0 𝑁 = (2 · 𝑚)) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∧ wa 401 ∧ w3a 1103 = wceq 1569 ∈ wcel 2146 ≠ wne 2958 ∃wrex 3089 (class class class)co 7427 ℂcc 11208 0cc0 11210 · cmul 11215 / cdiv 11983 2c2 12407 ℕ0cn0 12616 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1944 ax-6 2001 ax-7 2042 ax-8 2148 ax-9 2156 ax-10 2179 ax-11 2196 ax-12 2215 ax-ext 2735 ax-sep 5251 ax-nul 5262 ax-pow 5330 ax-pr 5394 ax-un 7758 ax-resscn 11267 ax-1cn 11268 ax-icn 11269 ax-addcl 11270 ax-addrcl 11271 ax-mulcl 11272 ax-mulrcl 11273 ax-mulcom 11274 ax-addass 11275 ax-mulass 11276 ax-distr 11277 ax-i2m1 11278 ax-1ne0 11279 ax-1rid 11280 ax-rnegex 11281 ax-rrecex 11282 ax-cnre 11283 ax-pre-lttri 11284 ax-pre-lttrn 11285 ax-pre-ltadd 11286 ax-pre-mulgt0 11287 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1572 df-fal 1582 df-ex 1812 df-nf 1816 df-sb 2101 df-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2838 df-nfc 2912 df-ne 2959 df-nel 3065 df-ral 3080 df-rex 3090 df-rmo 3368 df-reu 3369 df-rab 3416 df-v 3455 df-sbc 3742 df-csb 3851 df-ss 3900 df-pss 4016 df-dif 4049 df-in 4093 df-un 4153 df-nul 4281 df-if 4485 df-pw 4561 df-sn 4588 df-pr 4590 df-op 4838 df-uni 4870 df-iun 4955 df-br 5106 df-opab 5170 df-mpt 5189 df-tr 5215 df-id 5549 df-eprel 5554 df-po 5562 df-so 5563 df-fr 5607 df-we 5609 df-xp 5660 df-rel 5661 df-cnv 5662 df-co 5663 df-dm 5664 df-rn 5665 df-res 5666 df-ima 5667 df-pred 6310 df-ord 6371 df-on 6372 df-lim 6373 df-suc 6374 df-iota 6500 df-fun 6548 df-fn 6549 df-f 6550 df-f1 6551 df-fo 6552 df-f1o 6553 df-fv 6554 df-riota 7384 df-ov 7430 df-oprab 7431 df-mpo 7432 df-om 7885 df-2nd 8009 df-frecs 8310 df-wrecs 8341 df-recs 8390 df-rdg 8429 df-er 8728 df-en 8985 df-dom 8986 df-sdom 8987 df-pnf 11355 df-mnf 11356 df-xr 11357 df-ltxr 11358 df-le 11359 df-sub 11553 df-neg 11554 df-div 11984 df-nn 12346 df-2 12415 df-n0 12617 |
| This theorem is used by: (None) |
| Copyright terms: Public domain | W3C validator |