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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 16268 | . . 3 ⊢ (𝑁 ∈ ℤ → (¬ 2 ∥ 𝑁 ↔ ∃𝑛 ∈ ℤ ((2 · 𝑛) + 1) = 𝑁)) | |
| 2 | oveq2 7366 | . . . . . 6 ⊢ (𝑁 = ((2 · 𝑛) + 1) → (-1↑𝑁) = (-1↑((2 · 𝑛) + 1))) | |
| 3 | 2 | eqcoms 2744 | . . . . 5 ⊢ (((2 · 𝑛) + 1) = 𝑁 → (-1↑𝑁) = (-1↑((2 · 𝑛) + 1))) |
| 4 | neg1cn 12130 | . . . . . . . . 9 ⊢ -1 ∈ ℂ | |
| 5 | 4 | a1i 11 | . . . . . . . 8 ⊢ (𝑛 ∈ ℤ → -1 ∈ ℂ) |
| 6 | neg1ne0 12132 | . . . . . . . . 9 ⊢ -1 ≠ 0 | |
| 7 | 6 | a1i 11 | . . . . . . . 8 ⊢ (𝑛 ∈ ℤ → -1 ≠ 0) |
| 8 | 2z 12523 | . . . . . . . . . 10 ⊢ 2 ∈ ℤ | |
| 9 | 8 | a1i 11 | . . . . . . . . 9 ⊢ (𝑛 ∈ ℤ → 2 ∈ ℤ) |
| 10 | id 22 | . . . . . . . . 9 ⊢ (𝑛 ∈ ℤ → 𝑛 ∈ ℤ) | |
| 11 | 9, 10 | zmulcld 12602 | . . . . . . . 8 ⊢ (𝑛 ∈ ℤ → (2 · 𝑛) ∈ ℤ) |
| 12 | 5, 7, 11 | expp1zd 14078 | . . . . . . 7 ⊢ (𝑛 ∈ ℤ → (-1↑((2 · 𝑛) + 1)) = ((-1↑(2 · 𝑛)) · -1)) |
| 13 | m1expeven 14032 | . . . . . . . . 9 ⊢ (𝑛 ∈ ℤ → (-1↑(2 · 𝑛)) = 1) | |
| 14 | 13 | oveq1d 7373 | . . . . . . . 8 ⊢ (𝑛 ∈ ℤ → ((-1↑(2 · 𝑛)) · -1) = (1 · -1)) |
| 15 | 4 | mullidi 11137 | . . . . . . . 8 ⊢ (1 · -1) = -1 |
| 16 | 14, 15 | eqtrdi 2787 | . . . . . . 7 ⊢ (𝑛 ∈ ℤ → ((-1↑(2 · 𝑛)) · -1) = -1) |
| 17 | 12, 16 | eqtrd 2771 | . . . . . 6 ⊢ (𝑛 ∈ ℤ → (-1↑((2 · 𝑛) + 1)) = -1) |
| 18 | 17 | adantl 481 | . . . . 5 ⊢ ((𝑁 ∈ ℤ ∧ 𝑛 ∈ ℤ) → (-1↑((2 · 𝑛) + 1)) = -1) |
| 19 | 3, 18 | sylan9eqr 2793 | . . . 4 ⊢ (((𝑁 ∈ ℤ ∧ 𝑛 ∈ ℤ) ∧ ((2 · 𝑛) + 1) = 𝑁) → (-1↑𝑁) = -1) |
| 20 | 19 | rexlimdva2 3139 | . . 3 ⊢ (𝑁 ∈ ℤ → (∃𝑛 ∈ ℤ ((2 · 𝑛) + 1) = 𝑁 → (-1↑𝑁) = -1)) |
| 21 | 1, 20 | sylbid 240 | . 2 ⊢ (𝑁 ∈ ℤ → (¬ 2 ∥ 𝑁 → (-1↑𝑁) = -1)) |
| 22 | 21 | imp 406 | 1 ⊢ ((𝑁 ∈ ℤ ∧ ¬ 2 ∥ 𝑁) → (-1↑𝑁) = -1) |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 → wi 4 ∧ wa 395 = wceq 1541 ∈ wcel 2113 ≠ wne 2932 ∃wrex 3060 class class class wbr 5098 (class class class)co 7358 ℂcc 11024 0cc0 11026 1c1 11027 + caddc 11029 · cmul 11031 -cneg 11365 2c2 12200 ℤcz 12488 ↑cexp 13984 ∥ cdvds 16179 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1968 ax-7 2009 ax-8 2115 ax-9 2123 ax-10 2146 ax-11 2162 ax-12 2184 ax-ext 2708 ax-sep 5241 ax-nul 5251 ax-pow 5310 ax-pr 5377 ax-un 7680 ax-cnex 11082 ax-resscn 11083 ax-1cn 11084 ax-icn 11085 ax-addcl 11086 ax-addrcl 11087 ax-mulcl 11088 ax-mulrcl 11089 ax-mulcom 11090 ax-addass 11091 ax-mulass 11092 ax-distr 11093 ax-i2m1 11094 ax-1ne0 11095 ax-1rid 11096 ax-rnegex 11097 ax-rrecex 11098 ax-cnre 11099 ax-pre-lttri 11100 ax-pre-lttrn 11101 ax-pre-ltadd 11102 ax-pre-mulgt0 11103 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-nf 1785 df-sb 2068 df-mo 2539 df-eu 2569 df-clab 2715 df-cleq 2728 df-clel 2811 df-nfc 2885 df-ne 2933 df-nel 3037 df-ral 3052 df-rex 3061 df-rmo 3350 df-reu 3351 df-rab 3400 df-v 3442 df-sbc 3741 df-csb 3850 df-dif 3904 df-un 3906 df-in 3908 df-ss 3918 df-pss 3921 df-nul 4286 df-if 4480 df-pw 4556 df-sn 4581 df-pr 4583 df-op 4587 df-uni 4864 df-iun 4948 df-br 5099 df-opab 5161 df-mpt 5180 df-tr 5206 df-id 5519 df-eprel 5524 df-po 5532 df-so 5533 df-fr 5577 df-we 5579 df-xp 5630 df-rel 5631 df-cnv 5632 df-co 5633 df-dm 5634 df-rn 5635 df-res 5636 df-ima 5637 df-pred 6259 df-ord 6320 df-on 6321 df-lim 6322 df-suc 6323 df-iota 6448 df-fun 6494 df-fn 6495 df-f 6496 df-f1 6497 df-fo 6498 df-f1o 6499 df-fv 6500 df-riota 7315 df-ov 7361 df-oprab 7362 df-mpo 7363 df-om 7809 df-2nd 7934 df-frecs 8223 df-wrecs 8254 df-recs 8303 df-rdg 8341 df-er 8635 df-en 8884 df-dom 8885 df-sdom 8886 df-pnf 11168 df-mnf 11169 df-xr 11170 df-ltxr 11171 df-le 11172 df-sub 11366 df-neg 11367 df-div 11795 df-nn 12146 df-2 12208 df-n0 12402 df-z 12489 df-uz 12752 df-seq 13925 df-exp 13985 df-dvds 16180 |
| This theorem is referenced by: 2lgsoddprm 27383 cos9thpiminplylem1 33939 negexpidd 42924 |
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