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| Mirrors > Home > ILE Home > Th. List > m1expo | GIF version | ||
| Description: Exponentiation of -1 by an odd power. (Contributed by AV, 26-Jun-2021.) |
| Ref | Expression |
|---|---|
| m1expo | ⊢ ((𝑁 ∈ ℤ ∧ ¬ 2 ∥ 𝑁) → (-1↑𝑁) = -1) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | odd2np1 12495 | . . 3 ⊢ (𝑁 ∈ ℤ → (¬ 2 ∥ 𝑁 ↔ ∃𝑛 ∈ ℤ ((2 · 𝑛) + 1) = 𝑁)) | |
| 2 | oveq2 6036 | . . . . . . 7 ⊢ (𝑁 = ((2 · 𝑛) + 1) → (-1↑𝑁) = (-1↑((2 · 𝑛) + 1))) | |
| 3 | 2 | eqcoms 2234 | . . . . . 6 ⊢ (((2 · 𝑛) + 1) = 𝑁 → (-1↑𝑁) = (-1↑((2 · 𝑛) + 1))) |
| 4 | neg1cn 9291 | . . . . . . . . . 10 ⊢ -1 ∈ ℂ | |
| 5 | 4 | a1i 9 | . . . . . . . . 9 ⊢ (𝑛 ∈ ℤ → -1 ∈ ℂ) |
| 6 | neg1ap0 9295 | . . . . . . . . . 10 ⊢ -1 # 0 | |
| 7 | 6 | a1i 9 | . . . . . . . . 9 ⊢ (𝑛 ∈ ℤ → -1 # 0) |
| 8 | 2z 9550 | . . . . . . . . . . 11 ⊢ 2 ∈ ℤ | |
| 9 | 8 | a1i 9 | . . . . . . . . . 10 ⊢ (𝑛 ∈ ℤ → 2 ∈ ℤ) |
| 10 | id 19 | . . . . . . . . . 10 ⊢ (𝑛 ∈ ℤ → 𝑛 ∈ ℤ) | |
| 11 | 9, 10 | zmulcld 9651 | . . . . . . . . 9 ⊢ (𝑛 ∈ ℤ → (2 · 𝑛) ∈ ℤ) |
| 12 | 5, 7, 11 | expp1zapd 10988 | . . . . . . . 8 ⊢ (𝑛 ∈ ℤ → (-1↑((2 · 𝑛) + 1)) = ((-1↑(2 · 𝑛)) · -1)) |
| 13 | m1expeven 10892 | . . . . . . . . . 10 ⊢ (𝑛 ∈ ℤ → (-1↑(2 · 𝑛)) = 1) | |
| 14 | 13 | oveq1d 6043 | . . . . . . . . 9 ⊢ (𝑛 ∈ ℤ → ((-1↑(2 · 𝑛)) · -1) = (1 · -1)) |
| 15 | 4 | mullidi 8225 | . . . . . . . . 9 ⊢ (1 · -1) = -1 |
| 16 | 14, 15 | eqtrdi 2280 | . . . . . . . 8 ⊢ (𝑛 ∈ ℤ → ((-1↑(2 · 𝑛)) · -1) = -1) |
| 17 | 12, 16 | eqtrd 2264 | . . . . . . 7 ⊢ (𝑛 ∈ ℤ → (-1↑((2 · 𝑛) + 1)) = -1) |
| 18 | 17 | adantl 277 | . . . . . 6 ⊢ ((𝑁 ∈ ℤ ∧ 𝑛 ∈ ℤ) → (-1↑((2 · 𝑛) + 1)) = -1) |
| 19 | 3, 18 | sylan9eqr 2286 | . . . . 5 ⊢ (((𝑁 ∈ ℤ ∧ 𝑛 ∈ ℤ) ∧ ((2 · 𝑛) + 1) = 𝑁) → (-1↑𝑁) = -1) |
| 20 | 19 | ex 115 | . . . 4 ⊢ ((𝑁 ∈ ℤ ∧ 𝑛 ∈ ℤ) → (((2 · 𝑛) + 1) = 𝑁 → (-1↑𝑁) = -1)) |
| 21 | 20 | rexlimdva 2651 | . . 3 ⊢ (𝑁 ∈ ℤ → (∃𝑛 ∈ ℤ ((2 · 𝑛) + 1) = 𝑁 → (-1↑𝑁) = -1)) |
| 22 | 1, 21 | sylbid 150 | . 2 ⊢ (𝑁 ∈ ℤ → (¬ 2 ∥ 𝑁 → (-1↑𝑁) = -1)) |
| 23 | 22 | imp 124 | 1 ⊢ ((𝑁 ∈ ℤ ∧ ¬ 2 ∥ 𝑁) → (-1↑𝑁) = -1) |
| Colors of variables: wff set class |
| Syntax hints: ¬ wn 3 → wi 4 ∧ wa 104 = wceq 1398 ∈ wcel 2202 ∃wrex 2512 class class class wbr 4093 (class class class)co 6028 ℂcc 8073 0cc0 8075 1c1 8076 + caddc 8078 · cmul 8080 -cneg 8394 # cap 8804 2c2 9237 ℤcz 9522 ↑cexp 10844 ∥ cdvds 12409 |
| 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 619 ax-in2 620 ax-io 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-13 2204 ax-14 2205 ax-ext 2213 ax-coll 4209 ax-sep 4212 ax-nul 4220 ax-pow 4270 ax-pr 4305 ax-un 4536 ax-setind 4641 ax-iinf 4692 ax-cnex 8166 ax-resscn 8167 ax-1cn 8168 ax-1re 8169 ax-icn 8170 ax-addcl 8171 ax-addrcl 8172 ax-mulcl 8173 ax-mulrcl 8174 ax-addcom 8175 ax-mulcom 8176 ax-addass 8177 ax-mulass 8178 ax-distr 8179 ax-i2m1 8180 ax-0lt1 8181 ax-1rid 8182 ax-0id 8183 ax-rnegex 8184 ax-precex 8185 ax-cnre 8186 ax-pre-ltirr 8187 ax-pre-ltwlin 8188 ax-pre-lttrn 8189 ax-pre-apti 8190 ax-pre-ltadd 8191 ax-pre-mulgt0 8192 ax-pre-mulext 8193 |
| This theorem depends on definitions: df-bi 117 df-dc 843 df-3or 1006 df-3an 1007 df-tru 1401 df-fal 1404 df-xor 1421 df-nf 1510 df-sb 1811 df-eu 2082 df-mo 2083 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2364 df-ne 2404 df-nel 2499 df-ral 2516 df-rex 2517 df-reu 2518 df-rmo 2519 df-rab 2520 df-v 2805 df-sbc 3033 df-csb 3129 df-dif 3203 df-un 3205 df-in 3207 df-ss 3214 df-nul 3497 df-if 3608 df-pw 3658 df-sn 3679 df-pr 3680 df-op 3682 df-uni 3899 df-int 3934 df-iun 3977 df-br 4094 df-opab 4156 df-mpt 4157 df-tr 4193 df-id 4396 df-po 4399 df-iso 4400 df-iord 4469 df-on 4471 df-ilim 4472 df-suc 4474 df-iom 4695 df-xp 4737 df-rel 4738 df-cnv 4739 df-co 4740 df-dm 4741 df-rn 4742 df-res 4743 df-ima 4744 df-iota 5293 df-fun 5335 df-fn 5336 df-f 5337 df-f1 5338 df-fo 5339 df-f1o 5340 df-fv 5341 df-riota 5981 df-ov 6031 df-oprab 6032 df-mpo 6033 df-1st 6312 df-2nd 6313 df-recs 6514 df-frec 6600 df-pnf 8259 df-mnf 8260 df-xr 8261 df-ltxr 8262 df-le 8263 df-sub 8395 df-neg 8396 df-reap 8798 df-ap 8805 df-div 8896 df-inn 9187 df-2 9245 df-n0 9446 df-z 9523 df-uz 9799 df-seqfrec 10754 df-exp 10845 df-dvds 12410 |
| This theorem is referenced by: 2lgsoddprm 15912 |
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