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Mirrors > Home > MPE Home > Th. List > lagsubg | Structured version Visualization version GIF version |
Description: Lagrange's theorem for Groups: the order of any subgroup of a finite group is a divisor of the order of the group. This is Metamath 100 proof #71. (Contributed by Mario Carneiro, 11-Jul-2014.) (Revised by Mario Carneiro, 12-Aug-2015.) |
Ref | Expression |
---|---|
lagsubg.1 | ⊢ 𝑋 = (Base‘𝐺) |
Ref | Expression |
---|---|
lagsubg | ⊢ ((𝑌 ∈ (SubGrp‘𝐺) ∧ 𝑋 ∈ Fin) → (♯‘𝑌) ∥ (♯‘𝑋)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | simpr 487 | . . . . . . 7 ⊢ ((𝑌 ∈ (SubGrp‘𝐺) ∧ 𝑋 ∈ Fin) → 𝑋 ∈ Fin) | |
2 | pwfi 8805 | . . . . . . 7 ⊢ (𝑋 ∈ Fin ↔ 𝒫 𝑋 ∈ Fin) | |
3 | 1, 2 | sylib 220 | . . . . . 6 ⊢ ((𝑌 ∈ (SubGrp‘𝐺) ∧ 𝑋 ∈ Fin) → 𝒫 𝑋 ∈ Fin) |
4 | lagsubg.1 | . . . . . . . . 9 ⊢ 𝑋 = (Base‘𝐺) | |
5 | eqid 2821 | . . . . . . . . 9 ⊢ (𝐺 ~QG 𝑌) = (𝐺 ~QG 𝑌) | |
6 | 4, 5 | eqger 18313 | . . . . . . . 8 ⊢ (𝑌 ∈ (SubGrp‘𝐺) → (𝐺 ~QG 𝑌) Er 𝑋) |
7 | 6 | adantr 483 | . . . . . . 7 ⊢ ((𝑌 ∈ (SubGrp‘𝐺) ∧ 𝑋 ∈ Fin) → (𝐺 ~QG 𝑌) Er 𝑋) |
8 | 7 | qsss 8344 | . . . . . 6 ⊢ ((𝑌 ∈ (SubGrp‘𝐺) ∧ 𝑋 ∈ Fin) → (𝑋 / (𝐺 ~QG 𝑌)) ⊆ 𝒫 𝑋) |
9 | 3, 8 | ssfid 8727 | . . . . 5 ⊢ ((𝑌 ∈ (SubGrp‘𝐺) ∧ 𝑋 ∈ Fin) → (𝑋 / (𝐺 ~QG 𝑌)) ∈ Fin) |
10 | hashcl 13707 | . . . . 5 ⊢ ((𝑋 / (𝐺 ~QG 𝑌)) ∈ Fin → (♯‘(𝑋 / (𝐺 ~QG 𝑌))) ∈ ℕ0) | |
11 | 9, 10 | syl 17 | . . . 4 ⊢ ((𝑌 ∈ (SubGrp‘𝐺) ∧ 𝑋 ∈ Fin) → (♯‘(𝑋 / (𝐺 ~QG 𝑌))) ∈ ℕ0) |
12 | 11 | nn0zd 12072 | . . 3 ⊢ ((𝑌 ∈ (SubGrp‘𝐺) ∧ 𝑋 ∈ Fin) → (♯‘(𝑋 / (𝐺 ~QG 𝑌))) ∈ ℤ) |
13 | id 22 | . . . . . 6 ⊢ (𝑋 ∈ Fin → 𝑋 ∈ Fin) | |
14 | 4 | subgss 18263 | . . . . . 6 ⊢ (𝑌 ∈ (SubGrp‘𝐺) → 𝑌 ⊆ 𝑋) |
15 | ssfi 8724 | . . . . . 6 ⊢ ((𝑋 ∈ Fin ∧ 𝑌 ⊆ 𝑋) → 𝑌 ∈ Fin) | |
16 | 13, 14, 15 | syl2anr 598 | . . . . 5 ⊢ ((𝑌 ∈ (SubGrp‘𝐺) ∧ 𝑋 ∈ Fin) → 𝑌 ∈ Fin) |
17 | hashcl 13707 | . . . . 5 ⊢ (𝑌 ∈ Fin → (♯‘𝑌) ∈ ℕ0) | |
18 | 16, 17 | syl 17 | . . . 4 ⊢ ((𝑌 ∈ (SubGrp‘𝐺) ∧ 𝑋 ∈ Fin) → (♯‘𝑌) ∈ ℕ0) |
19 | 18 | nn0zd 12072 | . . 3 ⊢ ((𝑌 ∈ (SubGrp‘𝐺) ∧ 𝑋 ∈ Fin) → (♯‘𝑌) ∈ ℤ) |
20 | dvdsmul2 15617 | . . 3 ⊢ (((♯‘(𝑋 / (𝐺 ~QG 𝑌))) ∈ ℤ ∧ (♯‘𝑌) ∈ ℤ) → (♯‘𝑌) ∥ ((♯‘(𝑋 / (𝐺 ~QG 𝑌))) · (♯‘𝑌))) | |
21 | 12, 19, 20 | syl2anc 586 | . 2 ⊢ ((𝑌 ∈ (SubGrp‘𝐺) ∧ 𝑋 ∈ Fin) → (♯‘𝑌) ∥ ((♯‘(𝑋 / (𝐺 ~QG 𝑌))) · (♯‘𝑌))) |
22 | simpl 485 | . . 3 ⊢ ((𝑌 ∈ (SubGrp‘𝐺) ∧ 𝑋 ∈ Fin) → 𝑌 ∈ (SubGrp‘𝐺)) | |
23 | 4, 5, 22, 1 | lagsubg2 18324 | . 2 ⊢ ((𝑌 ∈ (SubGrp‘𝐺) ∧ 𝑋 ∈ Fin) → (♯‘𝑋) = ((♯‘(𝑋 / (𝐺 ~QG 𝑌))) · (♯‘𝑌))) |
24 | 21, 23 | breqtrrd 5080 | 1 ⊢ ((𝑌 ∈ (SubGrp‘𝐺) ∧ 𝑋 ∈ Fin) → (♯‘𝑌) ∥ (♯‘𝑋)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 398 = wceq 1537 ∈ wcel 2114 ⊆ wss 3924 𝒫 cpw 4525 class class class wbr 5052 ‘cfv 6341 (class class class)co 7142 Er wer 8272 / cqs 8274 Fincfn 8495 · cmul 10528 ℕ0cn0 11884 ℤcz 11968 ♯chash 13680 ∥ cdvds 15592 Basecbs 16466 SubGrpcsubg 18256 ~QG cqg 18258 |
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 2793 ax-rep 5176 ax-sep 5189 ax-nul 5196 ax-pow 5252 ax-pr 5316 ax-un 7447 ax-inf2 9090 ax-cnex 10579 ax-resscn 10580 ax-1cn 10581 ax-icn 10582 ax-addcl 10583 ax-addrcl 10584 ax-mulcl 10585 ax-mulrcl 10586 ax-mulcom 10587 ax-addass 10588 ax-mulass 10589 ax-distr 10590 ax-i2m1 10591 ax-1ne0 10592 ax-1rid 10593 ax-rnegex 10594 ax-rrecex 10595 ax-cnre 10596 ax-pre-lttri 10597 ax-pre-lttrn 10598 ax-pre-ltadd 10599 ax-pre-mulgt0 10600 ax-pre-sup 10601 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1540 df-fal 1550 df-ex 1781 df-nf 1785 df-sb 2070 df-mo 2622 df-eu 2654 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ne 3017 df-nel 3124 df-ral 3143 df-rex 3144 df-reu 3145 df-rmo 3146 df-rab 3147 df-v 3488 df-sbc 3764 df-csb 3872 df-dif 3927 df-un 3929 df-in 3931 df-ss 3940 df-pss 3942 df-nul 4280 df-if 4454 df-pw 4527 df-sn 4554 df-pr 4556 df-tp 4558 df-op 4560 df-uni 4825 df-int 4863 df-iun 4907 df-disj 5018 df-br 5053 df-opab 5115 df-mpt 5133 df-tr 5159 df-id 5446 df-eprel 5451 df-po 5460 df-so 5461 df-fr 5500 df-se 5501 df-we 5502 df-xp 5547 df-rel 5548 df-cnv 5549 df-co 5550 df-dm 5551 df-rn 5552 df-res 5553 df-ima 5554 df-pred 6134 df-ord 6180 df-on 6181 df-lim 6182 df-suc 6183 df-iota 6300 df-fun 6343 df-fn 6344 df-f 6345 df-f1 6346 df-fo 6347 df-f1o 6348 df-fv 6349 df-isom 6350 df-riota 7100 df-ov 7145 df-oprab 7146 df-mpo 7147 df-om 7567 df-1st 7675 df-2nd 7676 df-wrecs 7933 df-recs 7994 df-rdg 8032 df-1o 8088 df-2o 8089 df-oadd 8092 df-er 8275 df-ec 8277 df-qs 8281 df-map 8394 df-en 8496 df-dom 8497 df-sdom 8498 df-fin 8499 df-sup 8892 df-oi 8960 df-card 9354 df-pnf 10663 df-mnf 10664 df-xr 10665 df-ltxr 10666 df-le 10667 df-sub 10858 df-neg 10859 df-div 11284 df-nn 11625 df-2 11687 df-3 11688 df-n0 11885 df-z 11969 df-uz 12231 df-rp 12377 df-fz 12883 df-fzo 13024 df-seq 13360 df-exp 13420 df-hash 13681 df-cj 14443 df-re 14444 df-im 14445 df-sqrt 14579 df-abs 14580 df-clim 14830 df-sum 15028 df-dvds 15593 df-ndx 16469 df-slot 16470 df-base 16472 df-sets 16473 df-ress 16474 df-plusg 16561 df-0g 16698 df-mgm 17835 df-sgrp 17884 df-mnd 17895 df-grp 18089 df-minusg 18090 df-subg 18259 df-eqg 18261 |
This theorem is referenced by: oddvds2 18676 fislw 18733 sylow3lem4 18738 ablfacrp2 19172 ablfac1c 19176 ablfac1eu 19178 prmgrpsimpgd 19219 |
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