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Mirrors > Home > MPE Home > Th. List > odinv | Structured version Visualization version GIF version |
Description: The order of the inverse of a group element. (Contributed by Mario Carneiro, 20-Oct-2015.) |
Ref | Expression |
---|---|
odinv.1 | ⊢ 𝑂 = (od‘𝐺) |
odinv.2 | ⊢ 𝐼 = (invg‘𝐺) |
odinv.3 | ⊢ 𝑋 = (Base‘𝐺) |
Ref | Expression |
---|---|
odinv | ⊢ ((𝐺 ∈ Grp ∧ 𝐴 ∈ 𝑋) → (𝑂‘(𝐼‘𝐴)) = (𝑂‘𝐴)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | neg1z 12000 | . . 3 ⊢ -1 ∈ ℤ | |
2 | odinv.3 | . . . 4 ⊢ 𝑋 = (Base‘𝐺) | |
3 | odinv.1 | . . . 4 ⊢ 𝑂 = (od‘𝐺) | |
4 | eqid 2820 | . . . 4 ⊢ (.g‘𝐺) = (.g‘𝐺) | |
5 | 2, 3, 4 | odmulg 18661 | . . 3 ⊢ ((𝐺 ∈ Grp ∧ 𝐴 ∈ 𝑋 ∧ -1 ∈ ℤ) → (𝑂‘𝐴) = ((-1 gcd (𝑂‘𝐴)) · (𝑂‘(-1(.g‘𝐺)𝐴)))) |
6 | 1, 5 | mp3an3 1446 | . 2 ⊢ ((𝐺 ∈ Grp ∧ 𝐴 ∈ 𝑋) → (𝑂‘𝐴) = ((-1 gcd (𝑂‘𝐴)) · (𝑂‘(-1(.g‘𝐺)𝐴)))) |
7 | 2, 3 | odcl 18642 | . . . . . . 7 ⊢ (𝐴 ∈ 𝑋 → (𝑂‘𝐴) ∈ ℕ0) |
8 | 7 | adantl 484 | . . . . . 6 ⊢ ((𝐺 ∈ Grp ∧ 𝐴 ∈ 𝑋) → (𝑂‘𝐴) ∈ ℕ0) |
9 | 8 | nn0zd 12067 | . . . . 5 ⊢ ((𝐺 ∈ Grp ∧ 𝐴 ∈ 𝑋) → (𝑂‘𝐴) ∈ ℤ) |
10 | gcdcom 15840 | . . . . 5 ⊢ ((-1 ∈ ℤ ∧ (𝑂‘𝐴) ∈ ℤ) → (-1 gcd (𝑂‘𝐴)) = ((𝑂‘𝐴) gcd -1)) | |
11 | 1, 9, 10 | sylancr 589 | . . . 4 ⊢ ((𝐺 ∈ Grp ∧ 𝐴 ∈ 𝑋) → (-1 gcd (𝑂‘𝐴)) = ((𝑂‘𝐴) gcd -1)) |
12 | 1z 11994 | . . . . 5 ⊢ 1 ∈ ℤ | |
13 | gcdneg 15848 | . . . . 5 ⊢ (((𝑂‘𝐴) ∈ ℤ ∧ 1 ∈ ℤ) → ((𝑂‘𝐴) gcd -1) = ((𝑂‘𝐴) gcd 1)) | |
14 | 9, 12, 13 | sylancl 588 | . . . 4 ⊢ ((𝐺 ∈ Grp ∧ 𝐴 ∈ 𝑋) → ((𝑂‘𝐴) gcd -1) = ((𝑂‘𝐴) gcd 1)) |
15 | gcd1 15854 | . . . . 5 ⊢ ((𝑂‘𝐴) ∈ ℤ → ((𝑂‘𝐴) gcd 1) = 1) | |
16 | 9, 15 | syl 17 | . . . 4 ⊢ ((𝐺 ∈ Grp ∧ 𝐴 ∈ 𝑋) → ((𝑂‘𝐴) gcd 1) = 1) |
17 | 11, 14, 16 | 3eqtrd 2859 | . . 3 ⊢ ((𝐺 ∈ Grp ∧ 𝐴 ∈ 𝑋) → (-1 gcd (𝑂‘𝐴)) = 1) |
18 | odinv.2 | . . . . 5 ⊢ 𝐼 = (invg‘𝐺) | |
19 | 2, 4, 18 | mulgm1 18226 | . . . 4 ⊢ ((𝐺 ∈ Grp ∧ 𝐴 ∈ 𝑋) → (-1(.g‘𝐺)𝐴) = (𝐼‘𝐴)) |
20 | 19 | fveq2d 6655 | . . 3 ⊢ ((𝐺 ∈ Grp ∧ 𝐴 ∈ 𝑋) → (𝑂‘(-1(.g‘𝐺)𝐴)) = (𝑂‘(𝐼‘𝐴))) |
21 | 17, 20 | oveq12d 7155 | . 2 ⊢ ((𝐺 ∈ Grp ∧ 𝐴 ∈ 𝑋) → ((-1 gcd (𝑂‘𝐴)) · (𝑂‘(-1(.g‘𝐺)𝐴))) = (1 · (𝑂‘(𝐼‘𝐴)))) |
22 | 2, 18 | grpinvcl 18129 | . . . . 5 ⊢ ((𝐺 ∈ Grp ∧ 𝐴 ∈ 𝑋) → (𝐼‘𝐴) ∈ 𝑋) |
23 | 2, 3 | odcl 18642 | . . . . 5 ⊢ ((𝐼‘𝐴) ∈ 𝑋 → (𝑂‘(𝐼‘𝐴)) ∈ ℕ0) |
24 | 22, 23 | syl 17 | . . . 4 ⊢ ((𝐺 ∈ Grp ∧ 𝐴 ∈ 𝑋) → (𝑂‘(𝐼‘𝐴)) ∈ ℕ0) |
25 | 24 | nn0cnd 11939 | . . 3 ⊢ ((𝐺 ∈ Grp ∧ 𝐴 ∈ 𝑋) → (𝑂‘(𝐼‘𝐴)) ∈ ℂ) |
26 | 25 | mulid2d 10640 | . 2 ⊢ ((𝐺 ∈ Grp ∧ 𝐴 ∈ 𝑋) → (1 · (𝑂‘(𝐼‘𝐴))) = (𝑂‘(𝐼‘𝐴))) |
27 | 6, 21, 26 | 3eqtrrd 2860 | 1 ⊢ ((𝐺 ∈ Grp ∧ 𝐴 ∈ 𝑋) → (𝑂‘(𝐼‘𝐴)) = (𝑂‘𝐴)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 398 = wceq 1537 ∈ wcel 2114 ‘cfv 6336 (class class class)co 7137 1c1 10519 · cmul 10523 -cneg 10852 ℕ0cn0 11879 ℤcz 11963 gcd cgcd 15821 Basecbs 16461 Grpcgrp 18081 invgcminusg 18082 .gcmg 18202 odcod 18630 |
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 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2792 ax-sep 5184 ax-nul 5191 ax-pow 5247 ax-pr 5311 ax-un 7442 ax-cnex 10574 ax-resscn 10575 ax-1cn 10576 ax-icn 10577 ax-addcl 10578 ax-addrcl 10579 ax-mulcl 10580 ax-mulrcl 10581 ax-mulcom 10582 ax-addass 10583 ax-mulass 10584 ax-distr 10585 ax-i2m1 10586 ax-1ne0 10587 ax-1rid 10588 ax-rnegex 10589 ax-rrecex 10590 ax-cnre 10591 ax-pre-lttri 10592 ax-pre-lttrn 10593 ax-pre-ltadd 10594 ax-pre-mulgt0 10595 ax-pre-sup 10596 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-mo 2622 df-eu 2653 df-clab 2799 df-cleq 2813 df-clel 2891 df-nfc 2959 df-ne 3012 df-nel 3119 df-ral 3138 df-rex 3139 df-reu 3140 df-rmo 3141 df-rab 3142 df-v 3483 df-sbc 3759 df-csb 3867 df-dif 3922 df-un 3924 df-in 3926 df-ss 3935 df-pss 3937 df-nul 4275 df-if 4449 df-pw 4522 df-sn 4549 df-pr 4551 df-tp 4553 df-op 4555 df-uni 4820 df-iun 4902 df-br 5048 df-opab 5110 df-mpt 5128 df-tr 5154 df-id 5441 df-eprel 5446 df-po 5455 df-so 5456 df-fr 5495 df-we 5497 df-xp 5542 df-rel 5543 df-cnv 5544 df-co 5545 df-dm 5546 df-rn 5547 df-res 5548 df-ima 5549 df-pred 6129 df-ord 6175 df-on 6176 df-lim 6177 df-suc 6178 df-iota 6295 df-fun 6338 df-fn 6339 df-f 6340 df-f1 6341 df-fo 6342 df-f1o 6343 df-fv 6344 df-riota 7095 df-ov 7140 df-oprab 7141 df-mpo 7142 df-om 7562 df-1st 7670 df-2nd 7671 df-wrecs 7928 df-recs 7989 df-rdg 8027 df-er 8270 df-en 8491 df-dom 8492 df-sdom 8493 df-sup 8887 df-inf 8888 df-pnf 10658 df-mnf 10659 df-xr 10660 df-ltxr 10661 df-le 10662 df-sub 10853 df-neg 10854 df-div 11279 df-nn 11620 df-2 11682 df-3 11683 df-n0 11880 df-z 11964 df-uz 12226 df-rp 12372 df-fz 12878 df-fl 13147 df-mod 13223 df-seq 13355 df-exp 13415 df-cj 14438 df-re 14439 df-im 14440 df-sqrt 14574 df-abs 14575 df-dvds 15588 df-gcd 15822 df-0g 16693 df-mgm 17830 df-sgrp 17879 df-mnd 17890 df-grp 18084 df-minusg 18085 df-sbg 18086 df-mulg 18203 df-od 18634 |
This theorem is referenced by: torsubg 18952 oddvdssubg 18953 |
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