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| Mirrors > Home > MPE Home > Th. List > odsubdvds | Structured version Visualization version GIF version | ||
| Description: The order of an element of a subgroup divides the order of the subgroup. (Contributed by Mario Carneiro, 16-Jan-2015.) |
| Ref | Expression |
|---|---|
| odsubdvds.1 | ⊢ 𝑂 = (od‘𝐺) |
| Ref | Expression |
|---|---|
| odsubdvds | ⊢ ((𝑆 ∈ (SubGrp‘𝐺) ∧ 𝑆 ∈ Fin ∧ 𝐴 ∈ 𝑆) → (𝑂‘𝐴) ∥ (♯‘𝑆)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eqid 2730 | . . . . 5 ⊢ (𝐺 ↾s 𝑆) = (𝐺 ↾s 𝑆) | |
| 2 | 1 | subggrp 19067 | . . . 4 ⊢ (𝑆 ∈ (SubGrp‘𝐺) → (𝐺 ↾s 𝑆) ∈ Grp) |
| 3 | 2 | 3ad2ant1 1133 | . . 3 ⊢ ((𝑆 ∈ (SubGrp‘𝐺) ∧ 𝑆 ∈ Fin ∧ 𝐴 ∈ 𝑆) → (𝐺 ↾s 𝑆) ∈ Grp) |
| 4 | 1 | subgbas 19068 | . . . . 5 ⊢ (𝑆 ∈ (SubGrp‘𝐺) → 𝑆 = (Base‘(𝐺 ↾s 𝑆))) |
| 5 | 4 | 3ad2ant1 1133 | . . . 4 ⊢ ((𝑆 ∈ (SubGrp‘𝐺) ∧ 𝑆 ∈ Fin ∧ 𝐴 ∈ 𝑆) → 𝑆 = (Base‘(𝐺 ↾s 𝑆))) |
| 6 | simp2 1137 | . . . 4 ⊢ ((𝑆 ∈ (SubGrp‘𝐺) ∧ 𝑆 ∈ Fin ∧ 𝐴 ∈ 𝑆) → 𝑆 ∈ Fin) | |
| 7 | 5, 6 | eqeltrrd 2830 | . . 3 ⊢ ((𝑆 ∈ (SubGrp‘𝐺) ∧ 𝑆 ∈ Fin ∧ 𝐴 ∈ 𝑆) → (Base‘(𝐺 ↾s 𝑆)) ∈ Fin) |
| 8 | simp3 1138 | . . . 4 ⊢ ((𝑆 ∈ (SubGrp‘𝐺) ∧ 𝑆 ∈ Fin ∧ 𝐴 ∈ 𝑆) → 𝐴 ∈ 𝑆) | |
| 9 | 8, 5 | eleqtrd 2831 | . . 3 ⊢ ((𝑆 ∈ (SubGrp‘𝐺) ∧ 𝑆 ∈ Fin ∧ 𝐴 ∈ 𝑆) → 𝐴 ∈ (Base‘(𝐺 ↾s 𝑆))) |
| 10 | eqid 2730 | . . . 4 ⊢ (Base‘(𝐺 ↾s 𝑆)) = (Base‘(𝐺 ↾s 𝑆)) | |
| 11 | eqid 2730 | . . . 4 ⊢ (od‘(𝐺 ↾s 𝑆)) = (od‘(𝐺 ↾s 𝑆)) | |
| 12 | 10, 11 | oddvds2 19502 | . . 3 ⊢ (((𝐺 ↾s 𝑆) ∈ Grp ∧ (Base‘(𝐺 ↾s 𝑆)) ∈ Fin ∧ 𝐴 ∈ (Base‘(𝐺 ↾s 𝑆))) → ((od‘(𝐺 ↾s 𝑆))‘𝐴) ∥ (♯‘(Base‘(𝐺 ↾s 𝑆)))) |
| 13 | 3, 7, 9, 12 | syl3anc 1373 | . 2 ⊢ ((𝑆 ∈ (SubGrp‘𝐺) ∧ 𝑆 ∈ Fin ∧ 𝐴 ∈ 𝑆) → ((od‘(𝐺 ↾s 𝑆))‘𝐴) ∥ (♯‘(Base‘(𝐺 ↾s 𝑆)))) |
| 14 | odsubdvds.1 | . . . 4 ⊢ 𝑂 = (od‘𝐺) | |
| 15 | 1, 14, 11 | subgod 19506 | . . 3 ⊢ ((𝑆 ∈ (SubGrp‘𝐺) ∧ 𝐴 ∈ 𝑆) → (𝑂‘𝐴) = ((od‘(𝐺 ↾s 𝑆))‘𝐴)) |
| 16 | 15 | 3adant2 1131 | . 2 ⊢ ((𝑆 ∈ (SubGrp‘𝐺) ∧ 𝑆 ∈ Fin ∧ 𝐴 ∈ 𝑆) → (𝑂‘𝐴) = ((od‘(𝐺 ↾s 𝑆))‘𝐴)) |
| 17 | 5 | fveq2d 6864 | . 2 ⊢ ((𝑆 ∈ (SubGrp‘𝐺) ∧ 𝑆 ∈ Fin ∧ 𝐴 ∈ 𝑆) → (♯‘𝑆) = (♯‘(Base‘(𝐺 ↾s 𝑆)))) |
| 18 | 13, 16, 17 | 3brtr4d 5141 | 1 ⊢ ((𝑆 ∈ (SubGrp‘𝐺) ∧ 𝑆 ∈ Fin ∧ 𝐴 ∈ 𝑆) → (𝑂‘𝐴) ∥ (♯‘𝑆)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ w3a 1086 = wceq 1540 ∈ wcel 2109 class class class wbr 5109 ‘cfv 6513 (class class class)co 7389 Fincfn 8920 ♯chash 14301 ∥ cdvds 16228 Basecbs 17185 ↾s cress 17206 Grpcgrp 18871 SubGrpcsubg 19058 odcod 19460 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2008 ax-8 2111 ax-9 2119 ax-10 2142 ax-11 2158 ax-12 2178 ax-ext 2702 ax-rep 5236 ax-sep 5253 ax-nul 5263 ax-pow 5322 ax-pr 5389 ax-un 7713 ax-inf2 9600 ax-cnex 11130 ax-resscn 11131 ax-1cn 11132 ax-icn 11133 ax-addcl 11134 ax-addrcl 11135 ax-mulcl 11136 ax-mulrcl 11137 ax-mulcom 11138 ax-addass 11139 ax-mulass 11140 ax-distr 11141 ax-i2m1 11142 ax-1ne0 11143 ax-1rid 11144 ax-rnegex 11145 ax-rrecex 11146 ax-cnre 11147 ax-pre-lttri 11148 ax-pre-lttrn 11149 ax-pre-ltadd 11150 ax-pre-mulgt0 11151 ax-pre-sup 11152 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2066 df-mo 2534 df-eu 2563 df-clab 2709 df-cleq 2722 df-clel 2804 df-nfc 2879 df-ne 2927 df-nel 3031 df-ral 3046 df-rex 3055 df-rmo 3356 df-reu 3357 df-rab 3409 df-v 3452 df-sbc 3756 df-csb 3865 df-dif 3919 df-un 3921 df-in 3923 df-ss 3933 df-pss 3936 df-nul 4299 df-if 4491 df-pw 4567 df-sn 4592 df-pr 4594 df-op 4598 df-uni 4874 df-int 4913 df-iun 4959 df-disj 5077 df-br 5110 df-opab 5172 df-mpt 5191 df-tr 5217 df-id 5535 df-eprel 5540 df-po 5548 df-so 5549 df-fr 5593 df-se 5594 df-we 5595 df-xp 5646 df-rel 5647 df-cnv 5648 df-co 5649 df-dm 5650 df-rn 5651 df-res 5652 df-ima 5653 df-pred 6276 df-ord 6337 df-on 6338 df-lim 6339 df-suc 6340 df-iota 6466 df-fun 6515 df-fn 6516 df-f 6517 df-f1 6518 df-fo 6519 df-f1o 6520 df-fv 6521 df-isom 6522 df-riota 7346 df-ov 7392 df-oprab 7393 df-mpo 7394 df-om 7845 df-1st 7970 df-2nd 7971 df-frecs 8262 df-wrecs 8293 df-recs 8342 df-rdg 8380 df-1o 8436 df-oadd 8440 df-omul 8441 df-er 8673 df-ec 8675 df-qs 8679 df-map 8803 df-en 8921 df-dom 8922 df-sdom 8923 df-fin 8924 df-sup 9399 df-inf 9400 df-oi 9469 df-card 9898 df-acn 9901 df-pnf 11216 df-mnf 11217 df-xr 11218 df-ltxr 11219 df-le 11220 df-sub 11413 df-neg 11414 df-div 11842 df-nn 12188 df-2 12250 df-3 12251 df-n0 12449 df-z 12536 df-uz 12800 df-rp 12958 df-fz 13475 df-fzo 13622 df-fl 13760 df-mod 13838 df-seq 13973 df-exp 14033 df-hash 14302 df-cj 15071 df-re 15072 df-im 15073 df-sqrt 15207 df-abs 15208 df-clim 15460 df-sum 15659 df-dvds 16229 df-sets 17140 df-slot 17158 df-ndx 17170 df-base 17186 df-ress 17207 df-plusg 17239 df-0g 17410 df-mgm 18573 df-sgrp 18652 df-mnd 18668 df-submnd 18717 df-grp 18874 df-minusg 18875 df-sbg 18876 df-mulg 19006 df-subg 19061 df-eqg 19063 df-od 19464 |
| This theorem is referenced by: odcau 19540 ablfac1eu 20011 idomsubgmo 43175 |
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