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| Mirrors > Home > ILE Home > Th. List > oddnn02np1 | 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 2292 | . . . . . . . 8 ⊢ (((2 · 𝑛) + 1) = 𝑁 → (((2 · 𝑛) + 1) ∈ ℕ0 ↔ 𝑁 ∈ ℕ0)) | |
| 2 | elnn0z 9470 | . . . . . . . . 9 ⊢ (((2 · 𝑛) + 1) ∈ ℕ0 ↔ (((2 · 𝑛) + 1) ∈ ℤ ∧ 0 ≤ ((2 · 𝑛) + 1))) | |
| 3 | 2tnp1ge0ge0 10533 | . . . . . . . . . . . . 13 ⊢ (𝑛 ∈ ℤ → (0 ≤ ((2 · 𝑛) + 1) ↔ 0 ≤ 𝑛)) | |
| 4 | 3 | biimpd 144 | . . . . . . . . . . . 12 ⊢ (𝑛 ∈ ℤ → (0 ≤ ((2 · 𝑛) + 1) → 0 ≤ 𝑛)) |
| 5 | 4 | imdistani 445 | . . . . . . . . . . 11 ⊢ ((𝑛 ∈ ℤ ∧ 0 ≤ ((2 · 𝑛) + 1)) → (𝑛 ∈ ℤ ∧ 0 ≤ 𝑛)) |
| 6 | 5 | expcom 116 | . . . . . . . . . 10 ⊢ (0 ≤ ((2 · 𝑛) + 1) → (𝑛 ∈ ℤ → (𝑛 ∈ ℤ ∧ 0 ≤ 𝑛))) |
| 7 | elnn0z 9470 | . . . . . . . . . 10 ⊢ (𝑛 ∈ ℕ0 ↔ (𝑛 ∈ ℤ ∧ 0 ≤ 𝑛)) | |
| 8 | 6, 7 | imbitrrdi 162 | . . . . . . . . 9 ⊢ (0 ≤ ((2 · 𝑛) + 1) → (𝑛 ∈ ℤ → 𝑛 ∈ ℕ0)) |
| 9 | 2, 8 | simplbiim 387 | . . . . . . . 8 ⊢ (((2 · 𝑛) + 1) ∈ ℕ0 → (𝑛 ∈ ℤ → 𝑛 ∈ ℕ0)) |
| 10 | 1, 9 | biimtrrdi 164 | . . . . . . 7 ⊢ (((2 · 𝑛) + 1) = 𝑁 → (𝑁 ∈ ℕ0 → (𝑛 ∈ ℤ → 𝑛 ∈ ℕ0))) |
| 11 | 10 | com13 80 | . . . . . 6 ⊢ (𝑛 ∈ ℤ → (𝑁 ∈ ℕ0 → (((2 · 𝑛) + 1) = 𝑁 → 𝑛 ∈ ℕ0))) |
| 12 | 11 | impcom 125 | . . . . 5 ⊢ ((𝑁 ∈ ℕ0 ∧ 𝑛 ∈ ℤ) → (((2 · 𝑛) + 1) = 𝑁 → 𝑛 ∈ ℕ0)) |
| 13 | 12 | pm4.71rd 394 | . . . 4 ⊢ ((𝑁 ∈ ℕ0 ∧ 𝑛 ∈ ℤ) → (((2 · 𝑛) + 1) = 𝑁 ↔ (𝑛 ∈ ℕ0 ∧ ((2 · 𝑛) + 1) = 𝑁))) |
| 14 | 13 | bicomd 141 | . . 3 ⊢ ((𝑁 ∈ ℕ0 ∧ 𝑛 ∈ ℤ) → ((𝑛 ∈ ℕ0 ∧ ((2 · 𝑛) + 1) = 𝑁) ↔ ((2 · 𝑛) + 1) = 𝑁)) |
| 15 | 14 | rexbidva 2527 | . 2 ⊢ (𝑁 ∈ ℕ0 → (∃𝑛 ∈ ℤ (𝑛 ∈ ℕ0 ∧ ((2 · 𝑛) + 1) = 𝑁) ↔ ∃𝑛 ∈ ℤ ((2 · 𝑛) + 1) = 𝑁)) |
| 16 | nn0ssz 9475 | . . 3 ⊢ ℕ0 ⊆ ℤ | |
| 17 | rexss 3291 | . . 3 ⊢ (ℕ0 ⊆ ℤ → (∃𝑛 ∈ ℕ0 ((2 · 𝑛) + 1) = 𝑁 ↔ ∃𝑛 ∈ ℤ (𝑛 ∈ ℕ0 ∧ ((2 · 𝑛) + 1) = 𝑁))) | |
| 18 | 16, 17 | mp1i 10 | . 2 ⊢ (𝑁 ∈ ℕ0 → (∃𝑛 ∈ ℕ0 ((2 · 𝑛) + 1) = 𝑁 ↔ ∃𝑛 ∈ ℤ (𝑛 ∈ ℕ0 ∧ ((2 · 𝑛) + 1) = 𝑁))) |
| 19 | nn0z 9477 | . . 3 ⊢ (𝑁 ∈ ℕ0 → 𝑁 ∈ ℤ) | |
| 20 | odd2np1 12399 | . . 3 ⊢ (𝑁 ∈ ℤ → (¬ 2 ∥ 𝑁 ↔ ∃𝑛 ∈ ℤ ((2 · 𝑛) + 1) = 𝑁)) | |
| 21 | 19, 20 | syl 14 | . 2 ⊢ (𝑁 ∈ ℕ0 → (¬ 2 ∥ 𝑁 ↔ ∃𝑛 ∈ ℤ ((2 · 𝑛) + 1) = 𝑁)) |
| 22 | 15, 18, 21 | 3bitr4rd 221 | 1 ⊢ (𝑁 ∈ ℕ0 → (¬ 2 ∥ 𝑁 ↔ ∃𝑛 ∈ ℕ0 ((2 · 𝑛) + 1) = 𝑁)) |
| Colors of variables: wff set class |
| Syntax hints: ¬ wn 3 → wi 4 ∧ wa 104 ↔ wb 105 = wceq 1395 ∈ wcel 2200 ∃wrex 2509 ⊆ wss 3197 class class class wbr 4083 (class class class)co 6007 0cc0 8010 1c1 8011 + caddc 8013 · cmul 8015 ≤ cle 8193 2c2 9172 ℕ0cn0 9380 ℤcz 9457 ∥ cdvds 12313 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 617 ax-in2 618 ax-io 714 ax-5 1493 ax-7 1494 ax-gen 1495 ax-ie1 1539 ax-ie2 1540 ax-8 1550 ax-10 1551 ax-11 1552 ax-i12 1553 ax-bndl 1555 ax-4 1556 ax-17 1572 ax-i9 1576 ax-ial 1580 ax-i5r 1581 ax-13 2202 ax-14 2203 ax-ext 2211 ax-sep 4202 ax-pow 4258 ax-pr 4293 ax-un 4524 ax-setind 4629 ax-cnex 8101 ax-resscn 8102 ax-1cn 8103 ax-1re 8104 ax-icn 8105 ax-addcl 8106 ax-addrcl 8107 ax-mulcl 8108 ax-mulrcl 8109 ax-addcom 8110 ax-mulcom 8111 ax-addass 8112 ax-mulass 8113 ax-distr 8114 ax-i2m1 8115 ax-0lt1 8116 ax-1rid 8117 ax-0id 8118 ax-rnegex 8119 ax-precex 8120 ax-cnre 8121 ax-pre-ltirr 8122 ax-pre-ltwlin 8123 ax-pre-lttrn 8124 ax-pre-apti 8125 ax-pre-ltadd 8126 ax-pre-mulgt0 8127 ax-pre-mulext 8128 |
| This theorem depends on definitions: df-bi 117 df-3or 1003 df-3an 1004 df-tru 1398 df-fal 1401 df-xor 1418 df-nf 1507 df-sb 1809 df-eu 2080 df-mo 2081 df-clab 2216 df-cleq 2222 df-clel 2225 df-nfc 2361 df-ne 2401 df-nel 2496 df-ral 2513 df-rex 2514 df-reu 2515 df-rmo 2516 df-rab 2517 df-v 2801 df-sbc 3029 df-dif 3199 df-un 3201 df-in 3203 df-ss 3210 df-pw 3651 df-sn 3672 df-pr 3673 df-op 3675 df-uni 3889 df-int 3924 df-br 4084 df-opab 4146 df-id 4384 df-po 4387 df-iso 4388 df-xp 4725 df-rel 4726 df-cnv 4727 df-co 4728 df-dm 4729 df-iota 5278 df-fun 5320 df-fv 5326 df-riota 5960 df-ov 6010 df-oprab 6011 df-mpo 6012 df-pnf 8194 df-mnf 8195 df-xr 8196 df-ltxr 8197 df-le 8198 df-sub 8330 df-neg 8331 df-reap 8733 df-ap 8740 df-div 8831 df-inn 9122 df-2 9180 df-n0 9381 df-z 9458 df-dvds 12314 |
| This theorem is referenced by: oddge22np1 12407 2lgslem1c 15784 |
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