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| Mirrors > Home > ILE Home > Th. List > 2tp1odd | GIF version | ||
| Description: A number which is twice an integer increased by 1 is odd. (Contributed by AV, 16-Jul-2021.) |
| Ref | Expression |
|---|---|
| 2tp1odd | ⊢ ((𝐴 ∈ ℤ ∧ 𝐵 = ((2 · 𝐴) + 1)) → ¬ 2 ∥ 𝐵) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | id 19 | . . . . 5 ⊢ (𝐴 ∈ ℤ → 𝐴 ∈ ℤ) | |
| 2 | oveq2 5964 | . . . . . . . 8 ⊢ (𝑘 = 𝐴 → (2 · 𝑘) = (2 · 𝐴)) | |
| 3 | 2 | oveq1d 5971 | . . . . . . 7 ⊢ (𝑘 = 𝐴 → ((2 · 𝑘) + 1) = ((2 · 𝐴) + 1)) |
| 4 | 3 | eqeq1d 2215 | . . . . . 6 ⊢ (𝑘 = 𝐴 → (((2 · 𝑘) + 1) = ((2 · 𝐴) + 1) ↔ ((2 · 𝐴) + 1) = ((2 · 𝐴) + 1))) |
| 5 | 4 | adantl 277 | . . . . 5 ⊢ ((𝐴 ∈ ℤ ∧ 𝑘 = 𝐴) → (((2 · 𝑘) + 1) = ((2 · 𝐴) + 1) ↔ ((2 · 𝐴) + 1) = ((2 · 𝐴) + 1))) |
| 6 | eqidd 2207 | . . . . 5 ⊢ (𝐴 ∈ ℤ → ((2 · 𝐴) + 1) = ((2 · 𝐴) + 1)) | |
| 7 | 1, 5, 6 | rspcedvd 2887 | . . . 4 ⊢ (𝐴 ∈ ℤ → ∃𝑘 ∈ ℤ ((2 · 𝑘) + 1) = ((2 · 𝐴) + 1)) |
| 8 | 2z 9415 | . . . . . . . 8 ⊢ 2 ∈ ℤ | |
| 9 | 8 | a1i 9 | . . . . . . 7 ⊢ (𝐴 ∈ ℤ → 2 ∈ ℤ) |
| 10 | 9, 1 | zmulcld 9516 | . . . . . 6 ⊢ (𝐴 ∈ ℤ → (2 · 𝐴) ∈ ℤ) |
| 11 | 10 | peano2zd 9513 | . . . . 5 ⊢ (𝐴 ∈ ℤ → ((2 · 𝐴) + 1) ∈ ℤ) |
| 12 | odd2np1 12254 | . . . . 5 ⊢ (((2 · 𝐴) + 1) ∈ ℤ → (¬ 2 ∥ ((2 · 𝐴) + 1) ↔ ∃𝑘 ∈ ℤ ((2 · 𝑘) + 1) = ((2 · 𝐴) + 1))) | |
| 13 | 11, 12 | syl 14 | . . . 4 ⊢ (𝐴 ∈ ℤ → (¬ 2 ∥ ((2 · 𝐴) + 1) ↔ ∃𝑘 ∈ ℤ ((2 · 𝑘) + 1) = ((2 · 𝐴) + 1))) |
| 14 | 7, 13 | mpbird 167 | . . 3 ⊢ (𝐴 ∈ ℤ → ¬ 2 ∥ ((2 · 𝐴) + 1)) |
| 15 | 14 | adantr 276 | . 2 ⊢ ((𝐴 ∈ ℤ ∧ 𝐵 = ((2 · 𝐴) + 1)) → ¬ 2 ∥ ((2 · 𝐴) + 1)) |
| 16 | breq2 4054 | . . 3 ⊢ (𝐵 = ((2 · 𝐴) + 1) → (2 ∥ 𝐵 ↔ 2 ∥ ((2 · 𝐴) + 1))) | |
| 17 | 16 | adantl 277 | . 2 ⊢ ((𝐴 ∈ ℤ ∧ 𝐵 = ((2 · 𝐴) + 1)) → (2 ∥ 𝐵 ↔ 2 ∥ ((2 · 𝐴) + 1))) |
| 18 | 15, 17 | mtbird 675 | 1 ⊢ ((𝐴 ∈ ℤ ∧ 𝐵 = ((2 · 𝐴) + 1)) → ¬ 2 ∥ 𝐵) |
| Colors of variables: wff set class |
| Syntax hints: ¬ wn 3 → wi 4 ∧ wa 104 ↔ wb 105 = wceq 1373 ∈ wcel 2177 ∃wrex 2486 class class class wbr 4050 (class class class)co 5956 1c1 7941 + caddc 7943 · cmul 7945 2c2 9102 ℤcz 9387 ∥ cdvds 12168 |
| 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 615 ax-in2 616 ax-io 711 ax-5 1471 ax-7 1472 ax-gen 1473 ax-ie1 1517 ax-ie2 1518 ax-8 1528 ax-10 1529 ax-11 1530 ax-i12 1531 ax-bndl 1533 ax-4 1534 ax-17 1550 ax-i9 1554 ax-ial 1558 ax-i5r 1559 ax-13 2179 ax-14 2180 ax-ext 2188 ax-sep 4169 ax-pow 4225 ax-pr 4260 ax-un 4487 ax-setind 4592 ax-cnex 8031 ax-resscn 8032 ax-1cn 8033 ax-1re 8034 ax-icn 8035 ax-addcl 8036 ax-addrcl 8037 ax-mulcl 8038 ax-mulrcl 8039 ax-addcom 8040 ax-mulcom 8041 ax-addass 8042 ax-mulass 8043 ax-distr 8044 ax-i2m1 8045 ax-0lt1 8046 ax-1rid 8047 ax-0id 8048 ax-rnegex 8049 ax-precex 8050 ax-cnre 8051 ax-pre-ltirr 8052 ax-pre-ltwlin 8053 ax-pre-lttrn 8054 ax-pre-apti 8055 ax-pre-ltadd 8056 ax-pre-mulgt0 8057 ax-pre-mulext 8058 |
| This theorem depends on definitions: df-bi 117 df-3or 982 df-3an 983 df-tru 1376 df-fal 1379 df-xor 1396 df-nf 1485 df-sb 1787 df-eu 2058 df-mo 2059 df-clab 2193 df-cleq 2199 df-clel 2202 df-nfc 2338 df-ne 2378 df-nel 2473 df-ral 2490 df-rex 2491 df-reu 2492 df-rmo 2493 df-rab 2494 df-v 2775 df-sbc 3003 df-dif 3172 df-un 3174 df-in 3176 df-ss 3183 df-pw 3622 df-sn 3643 df-pr 3644 df-op 3646 df-uni 3856 df-int 3891 df-br 4051 df-opab 4113 df-id 4347 df-po 4350 df-iso 4351 df-xp 4688 df-rel 4689 df-cnv 4690 df-co 4691 df-dm 4692 df-iota 5240 df-fun 5281 df-fv 5287 df-riota 5911 df-ov 5959 df-oprab 5960 df-mpo 5961 df-pnf 8124 df-mnf 8125 df-xr 8126 df-ltxr 8127 df-le 8128 df-sub 8260 df-neg 8261 df-reap 8663 df-ap 8670 df-div 8761 df-inn 9052 df-2 9110 df-n0 9311 df-z 9388 df-dvds 12169 |
| This theorem is referenced by: 2lgslem3b1 15645 2lgslem3c1 15646 |
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