Metamath Proof Explorer |
< Previous
Next >
Nearby theorems |
||
Mirrors > Home > MPE Home > Th. List > od1 | Structured version Visualization version GIF version |
Description: The order of the group identity is one. (Contributed by Mario Carneiro, 14-Jan-2015.) (Revised by Mario Carneiro, 23-Sep-2015.) |
Ref | Expression |
---|---|
od1.1 | ⊢ 𝑂 = (od‘𝐺) |
od1.2 | ⊢ 0 = (0g‘𝐺) |
Ref | Expression |
---|---|
od1 | ⊢ (𝐺 ∈ Grp → (𝑂‘ 0 ) = 1) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eqid 2622 | . . . 4 ⊢ (Base‘𝐺) = (Base‘𝐺) | |
2 | od1.2 | . . . 4 ⊢ 0 = (0g‘𝐺) | |
3 | 1, 2 | grpidcl 17450 | . . 3 ⊢ (𝐺 ∈ Grp → 0 ∈ (Base‘𝐺)) |
4 | 1nn 11031 | . . . 4 ⊢ 1 ∈ ℕ | |
5 | 4 | a1i 11 | . . 3 ⊢ (𝐺 ∈ Grp → 1 ∈ ℕ) |
6 | eqid 2622 | . . . . 5 ⊢ (.g‘𝐺) = (.g‘𝐺) | |
7 | 1, 6 | mulg1 17548 | . . . 4 ⊢ ( 0 ∈ (Base‘𝐺) → (1(.g‘𝐺) 0 ) = 0 ) |
8 | 3, 7 | syl 17 | . . 3 ⊢ (𝐺 ∈ Grp → (1(.g‘𝐺) 0 ) = 0 ) |
9 | od1.1 | . . . 4 ⊢ 𝑂 = (od‘𝐺) | |
10 | 1, 9, 6, 2 | odlem2 17958 | . . 3 ⊢ (( 0 ∈ (Base‘𝐺) ∧ 1 ∈ ℕ ∧ (1(.g‘𝐺) 0 ) = 0 ) → (𝑂‘ 0 ) ∈ (1...1)) |
11 | 3, 5, 8, 10 | syl3anc 1326 | . 2 ⊢ (𝐺 ∈ Grp → (𝑂‘ 0 ) ∈ (1...1)) |
12 | elfz1eq 12352 | . 2 ⊢ ((𝑂‘ 0 ) ∈ (1...1) → (𝑂‘ 0 ) = 1) | |
13 | 11, 12 | syl 17 | 1 ⊢ (𝐺 ∈ Grp → (𝑂‘ 0 ) = 1) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 = wceq 1483 ∈ wcel 1990 ‘cfv 5888 (class class class)co 6650 1c1 9937 ℕcn 11020 ...cfz 12326 Basecbs 15857 0gc0g 16100 Grpcgrp 17422 .gcmg 17540 odcod 17944 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1722 ax-4 1737 ax-5 1839 ax-6 1888 ax-7 1935 ax-8 1992 ax-9 1999 ax-10 2019 ax-11 2034 ax-12 2047 ax-13 2246 ax-ext 2602 ax-rep 4771 ax-sep 4781 ax-nul 4789 ax-pow 4843 ax-pr 4906 ax-un 6949 ax-inf2 8538 ax-cnex 9992 ax-resscn 9993 ax-1cn 9994 ax-icn 9995 ax-addcl 9996 ax-addrcl 9997 ax-mulcl 9998 ax-mulrcl 9999 ax-mulcom 10000 ax-addass 10001 ax-mulass 10002 ax-distr 10003 ax-i2m1 10004 ax-1ne0 10005 ax-1rid 10006 ax-rnegex 10007 ax-rrecex 10008 ax-cnre 10009 ax-pre-lttri 10010 ax-pre-lttrn 10011 ax-pre-ltadd 10012 ax-pre-mulgt0 10013 |
This theorem depends on definitions: df-bi 197 df-or 385 df-an 386 df-3or 1038 df-3an 1039 df-tru 1486 df-ex 1705 df-nf 1710 df-sb 1881 df-eu 2474 df-mo 2475 df-clab 2609 df-cleq 2615 df-clel 2618 df-nfc 2753 df-ne 2795 df-nel 2898 df-ral 2917 df-rex 2918 df-reu 2919 df-rmo 2920 df-rab 2921 df-v 3202 df-sbc 3436 df-csb 3534 df-dif 3577 df-un 3579 df-in 3581 df-ss 3588 df-pss 3590 df-nul 3916 df-if 4087 df-pw 4160 df-sn 4178 df-pr 4180 df-tp 4182 df-op 4184 df-uni 4437 df-iun 4522 df-br 4654 df-opab 4713 df-mpt 4730 df-tr 4753 df-id 5024 df-eprel 5029 df-po 5035 df-so 5036 df-fr 5073 df-we 5075 df-xp 5120 df-rel 5121 df-cnv 5122 df-co 5123 df-dm 5124 df-rn 5125 df-res 5126 df-ima 5127 df-pred 5680 df-ord 5726 df-on 5727 df-lim 5728 df-suc 5729 df-iota 5851 df-fun 5890 df-fn 5891 df-f 5892 df-f1 5893 df-fo 5894 df-f1o 5895 df-fv 5896 df-riota 6611 df-ov 6653 df-oprab 6654 df-mpt2 6655 df-om 7066 df-1st 7168 df-2nd 7169 df-wrecs 7407 df-recs 7468 df-rdg 7506 df-er 7742 df-en 7956 df-dom 7957 df-sdom 7958 df-sup 8348 df-inf 8349 df-pnf 10076 df-mnf 10077 df-xr 10078 df-ltxr 10079 df-le 10080 df-sub 10268 df-neg 10269 df-nn 11021 df-n0 11293 df-z 11378 df-uz 11688 df-fz 12327 df-seq 12802 df-0g 16102 df-mgm 17242 df-sgrp 17284 df-mnd 17295 df-grp 17425 df-mulg 17541 df-od 17948 |
This theorem is referenced by: odeq1 17977 torsubg 18257 oddvdssubg 18258 pgpfaclem2 18481 |
Copyright terms: Public domain | W3C validator |