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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 10272 | . . 3 ⊢ (𝑁 ∈ ℤ → (¬ 2 ∥ 𝑁 ↔ ∃𝑛 ∈ ℤ ((2 · 𝑛) + 1) = 𝑁)) | |
2 | oveq2 5540 | . . . . . . 7 ⊢ (𝑁 = ((2 · 𝑛) + 1) → (-1↑𝑁) = (-1↑((2 · 𝑛) + 1))) | |
3 | 2 | eqcoms 2084 | . . . . . 6 ⊢ (((2 · 𝑛) + 1) = 𝑁 → (-1↑𝑁) = (-1↑((2 · 𝑛) + 1))) |
4 | neg1cn 8144 | . . . . . . . . . 10 ⊢ -1 ∈ ℂ | |
5 | 4 | a1i 9 | . . . . . . . . 9 ⊢ (𝑛 ∈ ℤ → -1 ∈ ℂ) |
6 | neg1ap0 8148 | . . . . . . . . . 10 ⊢ -1 # 0 | |
7 | 6 | a1i 9 | . . . . . . . . 9 ⊢ (𝑛 ∈ ℤ → -1 # 0) |
8 | 2z 8379 | . . . . . . . . . . 11 ⊢ 2 ∈ ℤ | |
9 | 8 | a1i 9 | . . . . . . . . . 10 ⊢ (𝑛 ∈ ℤ → 2 ∈ ℤ) |
10 | id 19 | . . . . . . . . . 10 ⊢ (𝑛 ∈ ℤ → 𝑛 ∈ ℤ) | |
11 | 9, 10 | zmulcld 8475 | . . . . . . . . 9 ⊢ (𝑛 ∈ ℤ → (2 · 𝑛) ∈ ℤ) |
12 | 5, 7, 11 | expp1zapd 9614 | . . . . . . . 8 ⊢ (𝑛 ∈ ℤ → (-1↑((2 · 𝑛) + 1)) = ((-1↑(2 · 𝑛)) · -1)) |
13 | m1expeven 9523 | . . . . . . . . . 10 ⊢ (𝑛 ∈ ℤ → (-1↑(2 · 𝑛)) = 1) | |
14 | 13 | oveq1d 5547 | . . . . . . . . 9 ⊢ (𝑛 ∈ ℤ → ((-1↑(2 · 𝑛)) · -1) = (1 · -1)) |
15 | 4 | mulid2i 7122 | . . . . . . . . 9 ⊢ (1 · -1) = -1 |
16 | 14, 15 | syl6eq 2129 | . . . . . . . 8 ⊢ (𝑛 ∈ ℤ → ((-1↑(2 · 𝑛)) · -1) = -1) |
17 | 12, 16 | eqtrd 2113 | . . . . . . 7 ⊢ (𝑛 ∈ ℤ → (-1↑((2 · 𝑛) + 1)) = -1) |
18 | 17 | adantl 271 | . . . . . 6 ⊢ ((𝑁 ∈ ℤ ∧ 𝑛 ∈ ℤ) → (-1↑((2 · 𝑛) + 1)) = -1) |
19 | 3, 18 | sylan9eqr 2135 | . . . . 5 ⊢ (((𝑁 ∈ ℤ ∧ 𝑛 ∈ ℤ) ∧ ((2 · 𝑛) + 1) = 𝑁) → (-1↑𝑁) = -1) |
20 | 19 | ex 113 | . . . 4 ⊢ ((𝑁 ∈ ℤ ∧ 𝑛 ∈ ℤ) → (((2 · 𝑛) + 1) = 𝑁 → (-1↑𝑁) = -1)) |
21 | 20 | rexlimdva 2477 | . . 3 ⊢ (𝑁 ∈ ℤ → (∃𝑛 ∈ ℤ ((2 · 𝑛) + 1) = 𝑁 → (-1↑𝑁) = -1)) |
22 | 1, 21 | sylbid 148 | . 2 ⊢ (𝑁 ∈ ℤ → (¬ 2 ∥ 𝑁 → (-1↑𝑁) = -1)) |
23 | 22 | imp 122 | 1 ⊢ ((𝑁 ∈ ℤ ∧ ¬ 2 ∥ 𝑁) → (-1↑𝑁) = -1) |
Colors of variables: wff set class |
Syntax hints: ¬ wn 3 → wi 4 ∧ wa 102 = wceq 1284 ∈ wcel 1433 ∃wrex 2349 class class class wbr 3785 (class class class)co 5532 ℂcc 6979 0cc0 6981 1c1 6982 + caddc 6984 · cmul 6986 -cneg 7280 # cap 7681 2c2 8089 ℤcz 8351 ↑cexp 9475 ∥ cdvds 10195 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 104 ax-ia2 105 ax-ia3 106 ax-in1 576 ax-in2 577 ax-io 662 ax-5 1376 ax-7 1377 ax-gen 1378 ax-ie1 1422 ax-ie2 1423 ax-8 1435 ax-10 1436 ax-11 1437 ax-i12 1438 ax-bndl 1439 ax-4 1440 ax-13 1444 ax-14 1445 ax-17 1459 ax-i9 1463 ax-ial 1467 ax-i5r 1468 ax-ext 2063 ax-coll 3893 ax-sep 3896 ax-nul 3904 ax-pow 3948 ax-pr 3964 ax-un 4188 ax-setind 4280 ax-iinf 4329 ax-cnex 7067 ax-resscn 7068 ax-1cn 7069 ax-1re 7070 ax-icn 7071 ax-addcl 7072 ax-addrcl 7073 ax-mulcl 7074 ax-mulrcl 7075 ax-addcom 7076 ax-mulcom 7077 ax-addass 7078 ax-mulass 7079 ax-distr 7080 ax-i2m1 7081 ax-0lt1 7082 ax-1rid 7083 ax-0id 7084 ax-rnegex 7085 ax-precex 7086 ax-cnre 7087 ax-pre-ltirr 7088 ax-pre-ltwlin 7089 ax-pre-lttrn 7090 ax-pre-apti 7091 ax-pre-ltadd 7092 ax-pre-mulgt0 7093 ax-pre-mulext 7094 |
This theorem depends on definitions: df-bi 115 df-dc 776 df-3or 920 df-3an 921 df-tru 1287 df-fal 1290 df-xor 1307 df-nf 1390 df-sb 1686 df-eu 1944 df-mo 1945 df-clab 2068 df-cleq 2074 df-clel 2077 df-nfc 2208 df-ne 2246 df-nel 2340 df-ral 2353 df-rex 2354 df-reu 2355 df-rmo 2356 df-rab 2357 df-v 2603 df-sbc 2816 df-csb 2909 df-dif 2975 df-un 2977 df-in 2979 df-ss 2986 df-nul 3252 df-if 3352 df-pw 3384 df-sn 3404 df-pr 3405 df-op 3407 df-uni 3602 df-int 3637 df-iun 3680 df-br 3786 df-opab 3840 df-mpt 3841 df-tr 3876 df-id 4048 df-po 4051 df-iso 4052 df-iord 4121 df-on 4123 df-suc 4126 df-iom 4332 df-xp 4369 df-rel 4370 df-cnv 4371 df-co 4372 df-dm 4373 df-rn 4374 df-res 4375 df-ima 4376 df-iota 4887 df-fun 4924 df-fn 4925 df-f 4926 df-f1 4927 df-fo 4928 df-f1o 4929 df-fv 4930 df-riota 5488 df-ov 5535 df-oprab 5536 df-mpt2 5537 df-1st 5787 df-2nd 5788 df-recs 5943 df-frec 6001 df-pnf 7155 df-mnf 7156 df-xr 7157 df-ltxr 7158 df-le 7159 df-sub 7281 df-neg 7282 df-reap 7675 df-ap 7682 df-div 7761 df-inn 8040 df-2 8098 df-n0 8289 df-z 8352 df-uz 8620 df-iseq 9432 df-iexp 9476 df-dvds 10196 |
This theorem is referenced by: (None) |
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