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| Mirrors > Home > MPE Home > Th. List > oddnn02np1 | Structured version Visualization version GIF version | ||
| Description: A nonnegative integer is odd iff it is one plus twice another nonnegative integer. (Contributed by AV, 19-Jun-2021.) |
| Ref | Expression |
|---|---|
| oddnn02np1 | ⊢ (𝑁 ∈ ℕ0 → (¬ 2 ∥ 𝑁 ↔ ∃𝑛 ∈ ℕ0 ((2 · 𝑛) + 1) = 𝑁)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eleq1 2857 | . . . . . . . 8 ⊢ (((2 · 𝑛) + 1) = 𝑁 → (((2 · 𝑛) + 1) ∈ ℕ0 ↔ 𝑁 ∈ ℕ0)) | |
| 2 | elnn0z 12604 | . . . . . . . . 9 ⊢ (((2 · 𝑛) + 1) ∈ ℕ0 ↔ (((2 · 𝑛) + 1) ∈ ℤ ∧ 0 ≤ ((2 · 𝑛) + 1))) | |
| 3 | 2tnp1ge0ge0 13862 | . . . . . . . . . . . . 13 ⊢ (𝑛 ∈ ℤ → (0 ≤ ((2 · 𝑛) + 1) ↔ 0 ≤ 𝑛)) | |
| 4 | 3 | biimpd 232 | . . . . . . . . . . . 12 ⊢ (𝑛 ∈ ℤ → (0 ≤ ((2 · 𝑛) + 1) → 0 ≤ 𝑛)) |
| 5 | 4 | imdistani 578 | . . . . . . . . . . 11 ⊢ ((𝑛 ∈ ℤ ∧ 0 ≤ ((2 · 𝑛) + 1)) → (𝑛 ∈ ℤ ∧ 0 ≤ 𝑛)) |
| 6 | 5 | expcom 418 | . . . . . . . . . 10 ⊢ (0 ≤ ((2 · 𝑛) + 1) → (𝑛 ∈ ℤ → (𝑛 ∈ ℤ ∧ 0 ≤ 𝑛))) |
| 7 | elnn0z 12604 | . . . . . . . . . 10 ⊢ (𝑛 ∈ ℕ0 ↔ (𝑛 ∈ ℤ ∧ 0 ≤ 𝑛)) | |
| 8 | 6, 7 | imbitrrdi 255 | . . . . . . . . 9 ⊢ (0 ≤ ((2 · 𝑛) + 1) → (𝑛 ∈ ℤ → 𝑛 ∈ ℕ0)) |
| 9 | 2, 8 | simplbiim 513 | . . . . . . . 8 ⊢ (((2 · 𝑛) + 1) ∈ ℕ0 → (𝑛 ∈ ℤ → 𝑛 ∈ ℕ0)) |
| 10 | 1, 9 | biimtrrdi 257 | . . . . . . 7 ⊢ (((2 · 𝑛) + 1) = 𝑁 → (𝑁 ∈ ℕ0 → (𝑛 ∈ ℤ → 𝑛 ∈ ℕ0))) |
| 11 | 10 | com13 89 | . . . . . 6 ⊢ (𝑛 ∈ ℤ → (𝑁 ∈ ℕ0 → (((2 · 𝑛) + 1) = 𝑁 → 𝑛 ∈ ℕ0))) |
| 12 | 11 | impcom 412 | . . . . 5 ⊢ ((𝑁 ∈ ℕ0 ∧ 𝑛 ∈ ℤ) → (((2 · 𝑛) + 1) = 𝑁 → 𝑛 ∈ ℕ0)) |
| 13 | 12 | pm4.71rd 571 | . . . 4 ⊢ ((𝑁 ∈ ℕ0 ∧ 𝑛 ∈ ℤ) → (((2 · 𝑛) + 1) = 𝑁 ↔ (𝑛 ∈ ℕ0 ∧ ((2 · 𝑛) + 1) = 𝑁))) |
| 14 | 13 | bicomd 226 | . . 3 ⊢ ((𝑁 ∈ ℕ0 ∧ 𝑛 ∈ ℤ) → ((𝑛 ∈ ℕ0 ∧ ((2 · 𝑛) + 1) = 𝑁) ↔ ((2 · 𝑛) + 1) = 𝑁)) |
| 15 | 14 | rexbidva 3193 | . 2 ⊢ (𝑁 ∈ ℕ0 → (∃𝑛 ∈ ℤ (𝑛 ∈ ℕ0 ∧ ((2 · 𝑛) + 1) = 𝑁) ↔ ∃𝑛 ∈ ℤ ((2 · 𝑛) + 1) = 𝑁)) |
| 16 | nn0ssz 12614 | . . 3 ⊢ ℕ0 ⊆ ℤ | |
| 17 | rexss 4019 | . . 3 ⊢ (ℕ0 ⊆ ℤ → (∃𝑛 ∈ ℕ0 ((2 · 𝑛) + 1) = 𝑁 ↔ ∃𝑛 ∈ ℤ (𝑛 ∈ ℕ0 ∧ ((2 · 𝑛) + 1) = 𝑁))) | |
| 18 | 16, 17 | mp1i 14 | . 2 ⊢ (𝑁 ∈ ℕ0 → (∃𝑛 ∈ ℕ0 ((2 · 𝑛) + 1) = 𝑁 ↔ ∃𝑛 ∈ ℤ (𝑛 ∈ ℕ0 ∧ ((2 · 𝑛) + 1) = 𝑁))) |
| 19 | nn0z 12615 | . . 3 ⊢ (𝑁 ∈ ℕ0 → 𝑁 ∈ ℤ) | |
| 20 | odd2np1 16399 | . . 3 ⊢ (𝑁 ∈ ℤ → (¬ 2 ∥ 𝑁 ↔ ∃𝑛 ∈ ℤ ((2 · 𝑛) + 1) = 𝑁)) | |
| 21 | 19, 20 | syl 18 | . 2 ⊢ (𝑁 ∈ ℕ0 → (¬ 2 ∥ 𝑁 ↔ ∃𝑛 ∈ ℤ ((2 · 𝑛) + 1) = 𝑁)) |
| 22 | 15, 18, 21 | 3bitr4rd 315 | 1 ⊢ (𝑁 ∈ ℕ0 → (¬ 2 ∥ 𝑁 ↔ ∃𝑛 ∈ ℕ0 ((2 · 𝑛) + 1) = 𝑁)) |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 → wi 4 ↔ wb 209 ∧ wa 400 = wceq 1567 ∈ wcel 2149 ∃wrex 3095 ⊆ wss 3913 class class class wbr 5113 (class class class)co 7411 0cc0 11100 1c1 11101 + caddc 11103 · cmul 11105 ≤ cle 11244 2c2 12295 ℕ0cn0 12504 ℤcz 12591 ∥ cdvds 16310 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1822 ax-4 1836 ax-5 1937 ax-6 1994 ax-7 2035 ax-8 2151 ax-9 2159 ax-10 2182 ax-11 2198 ax-12 2219 ax-ext 2741 ax-sep 5261 ax-nul 5271 ax-pow 5337 ax-pr 5405 ax-un 7733 ax-cnex 11156 ax-resscn 11157 ax-1cn 11158 ax-icn 11159 ax-addcl 11160 ax-addrcl 11161 ax-mulcl 11162 ax-mulrcl 11163 ax-mulcom 11164 ax-addass 11165 ax-mulass 11166 ax-distr 11167 ax-i2m1 11168 ax-1ne0 11169 ax-1rid 11170 ax-rnegex 11171 ax-rrecex 11172 ax-cnre 11173 ax-pre-lttri 11174 ax-pre-lttrn 11175 ax-pre-ltadd 11176 ax-pre-mulgt0 11177 ax-pre-sup 11178 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3or 1102 df-3an 1103 df-tru 1570 df-fal 1580 df-ex 1807 df-nf 1811 df-sb 2098 df-mo 2573 df-eu 2603 df-clab 2748 df-cleq 2761 df-clel 2844 df-nfc 2918 df-ne 2965 df-nel 3071 df-ral 3086 df-rex 3096 df-rmo 3376 df-reu 3377 df-rab 3424 df-v 3465 df-sbc 3754 df-csb 3862 df-dif 3916 df-un 3918 df-in 3920 df-ss 3930 df-pss 3933 df-nul 4295 df-if 4493 df-pw 4569 df-sn 4595 df-pr 4597 df-op 4601 df-uni 4877 df-iun 4962 df-br 5114 df-opab 5178 df-mpt 5197 df-tr 5223 df-id 5557 df-eprel 5562 df-po 5570 df-so 5571 df-fr 5615 df-we 5617 df-xp 5668 df-rel 5669 df-cnv 5670 df-co 5671 df-dm 5672 df-rn 5673 df-res 5674 df-ima 5675 df-pred 6303 df-ord 6364 df-on 6365 df-lim 6366 df-suc 6367 df-iota 6493 df-fun 6539 df-fn 6540 df-f 6541 df-f1 6542 df-fo 6543 df-f1o 6544 df-fv 6545 df-riota 7368 df-ov 7414 df-oprab 7415 df-mpo 7416 df-om 7863 df-2nd 7987 df-frecs 8278 df-wrecs 8309 df-recs 8358 df-rdg 8397 df-er 8694 df-en 8944 df-dom 8945 df-sdom 8946 df-sup 9402 df-inf 9403 df-pnf 11245 df-mnf 11246 df-xr 11247 df-ltxr 11248 df-le 11249 df-sub 11443 df-neg 11444 df-div 11872 df-nn 12234 df-2 12303 df-n0 12505 df-z 12592 df-uz 12863 df-rp 13017 df-fl 13825 df-dvds 16311 |
| This theorem is referenced by: oddge22np1 16407 2lgslem1c 27523 |
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