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| Mirrors > Home > MPE Home > Th. List > m1expo | Structured version Visualization version 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 16555 | . . 3 ⊢ (𝑁 ∈ ℤ → (¬ 2 ∥ 𝑁 ↔ ∃𝑛 ∈ ℤ ((2 · 𝑛) + 1) = 𝑁)) | |
| 2 | oveq2 7459 | . . . . . 6 ⊢ (𝑁 = ((2 · 𝑛) + 1) → ( -1↑𝑁) = ( -1↑((2 · 𝑛) + 1))) | |
| 3 | 2 | eqcoms 2771 | . . . . 5 ⊢ (((2 · 𝑛) + 1) = 𝑁 → ( -1↑𝑁) = ( -1↑((2 · 𝑛) + 1))) |
| 4 | neg1cn 12345 | . . . . . . . . 9 ⊢ -1 ∈ ℂ | |
| 5 | 4 | a1i 11 | . . . . . . . 8 ⊢ (𝑛 ∈ ℤ → -1 ∈ ℂ) |
| 6 | neg1ne0 12347 | . . . . . . . . 9 ⊢ -1 ≠ 0 | |
| 7 | 6 | a1i 11 | . . . . . . . 8 ⊢ (𝑛 ∈ ℤ → -1 ≠ 0) |
| 8 | 2z 12768 | . . . . . . . . . 10 ⊢ 2 ∈ ℤ | |
| 9 | 8 | a1i 11 | . . . . . . . . 9 ⊢ (𝑛 ∈ ℤ → 2 ∈ ℤ) |
| 10 | id 23 | . . . . . . . . 9 ⊢ (𝑛 ∈ ℤ → 𝑛 ∈ ℤ) | |
| 11 | 9, 10 | zmulcld 12849 | . . . . . . . 8 ⊢ (𝑛 ∈ ℤ → (2 · 𝑛) ∈ ℤ) |
| 12 | 5, 7, 11 | expp1zd 14338 | . . . . . . 7 ⊢ (𝑛 ∈ ℤ → ( -1↑((2 · 𝑛) + 1)) = (( -1↑(2 · 𝑛)) · -1)) |
| 13 | m1expeven 14292 | . . . . . . . . 9 ⊢ (𝑛 ∈ ℤ → ( -1↑(2 · 𝑛)) = 1) | |
| 14 | 13 | oveq1d 7466 | . . . . . . . 8 ⊢ (𝑛 ∈ ℤ → (( -1↑(2 · 𝑛)) · -1) = (1 · -1)) |
| 15 | 4 | mullidi 11353 | . . . . . . . 8 ⊢ (1 · -1) = -1 |
| 16 | 14, 15 | eqtrdi 2814 | . . . . . . 7 ⊢ (𝑛 ∈ ℤ → (( -1↑(2 · 𝑛)) · -1) = -1) |
| 17 | 12, 16 | eqtrd 2798 | . . . . . 6 ⊢ (𝑛 ∈ ℤ → ( -1↑((2 · 𝑛) + 1)) = -1) |
| 18 | 17 | adantl 487 | . . . . 5 ⊢ ((𝑁 ∈ ℤ ∧ 𝑛 ∈ ℤ) → ( -1↑((2 · 𝑛) + 1)) = -1) |
| 19 | 3, 18 | sylan9eqr 2820 | . . . 4 ⊢ (((𝑁 ∈ ℤ ∧ 𝑛 ∈ ℤ) ∧ ((2 · 𝑛) + 1) = 𝑁) → ( -1↑𝑁) = -1) |
| 20 | 19 | rexlimdva2 3169 | . . 3 ⊢ (𝑁 ∈ ℤ → (∃𝑛 ∈ ℤ ((2 · 𝑛) + 1) = 𝑁 → ( -1↑𝑁) = -1)) |
| 21 | 1, 20 | sylbid 243 | . 2 ⊢ (𝑁 ∈ ℤ → (¬ 2 ∥ 𝑁 → ( -1↑𝑁) = -1)) |
| 22 | 21 | imp 412 | 1 ⊢ ((𝑁 ∈ ℤ ∧ ¬ 2 ∥ 𝑁) → ( -1↑𝑁) = -1) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ¬ wn 3 → wi 4 ∧ wa 401 = wceq 1570 ∈ wcel 2147 ≠ wne 2959 ∃wrex 3090 class class class wbr 5108 (class class class)co 7451 ℂcc 11237 0cc0 11239 1c1 11240 + caddc 11242 · cmul 11244 -cneg 11581 2c2 12437 ℤcz 12733 ↑cexp 14244 ∥ cdvds 16466 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1945 ax-6 2002 ax-7 2043 ax-8 2149 ax-9 2157 ax-10 2180 ax-11 2197 ax-12 2216 ax-ext 2735 ax-sep 5255 ax-nul 5266 ax-pow 5334 ax-pr 5398 ax-un 7783 ax-cnex 11295 ax-resscn 11296 ax-1cn 11297 ax-icn 11298 ax-addcl 11299 ax-addrcl 11300 ax-mulcl 11301 ax-mulrcl 11302 ax-mulcom 11303 ax-addass 11304 ax-mulass 11305 ax-distr 11306 ax-i2m1 11307 ax-1ne0 11308 ax-1rid 11309 ax-rnegex 11310 ax-rrecex 11311 ax-cnre 11312 ax-pre-lttri 11313 ax-pre-lttrn 11314 ax-pre-ltadd 11315 ax-pre-mulgt0 11316 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2102 df-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2839 df-nfc 2913 df-ne 2960 df-nel 3066 df-ral 3081 df-rex 3091 df-rmo 3369 df-reu 3370 df-rab 3417 df-v 3456 df-sbc 3743 df-csb 3852 df-ss 3901 df-pss 4017 df-dif 4050 df-in 4094 df-un 4154 df-nul 4282 df-if 4486 df-pw 4562 df-sn 4589 df-pr 4591 df-op 4841 df-uni 4873 df-iun 4958 df-br 5109 df-opab 5174 df-mpt 5193 df-tr 5219 df-id 5553 df-eprel 5558 df-po 5566 df-so 5567 df-fr 5611 df-we 5613 df-xp 5664 df-rel 5665 df-cnv 5666 df-co 5667 df-dm 5668 df-rn 5669 df-res 5670 df-ima 5671 df-pred 6330 df-ord 6391 df-on 6392 df-lim 6393 df-suc 6394 df-iota 6520 df-fun 6568 df-fn 6569 df-f 6570 df-f1 6571 df-fo 6572 df-f1o 6573 df-fv 6574 df-riota 7408 df-ov 7454 df-oprab 7455 df-mpo 7456 df-om 7912 df-2nd 8036 df-frecs 8337 df-wrecs 8368 df-recs 8417 df-rdg 8456 df-er 8755 df-en 9012 df-dom 9013 df-sdom 9014 df-pnf 11384 df-mnf 11385 df-xr 11386 df-ltxr 11387 df-le 11388 df-sub 11582 df-neg 11583 df-div 12014 df-nn 12376 df-2 12445 df-n0 12647 df-z 12734 df-uz 13006 df-seq 14185 df-exp 14245 df-dvds 16467 |
| This theorem is used by: 2lgsoddprm 27800 cos9thpiminplylem1 34525 negexpidd 43958 |
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