orbsta2 - Metamath Proof Explorer

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Theorem orbsta2 19287

Description: Relation between the size of the orbit and the size of the stabilizer of a point in a finite group action. (Contributed by Mario Carneiro, 16-Jan-2015.)

**Hypotheses**
Ref	Expression
orbsta2.x	⊢ 𝑋 = (Base‘𝐺)
orbsta2.h	⊢ 𝐻 = {𝑢 ∈ 𝑋 ∣ (𝑢 ⊕ 𝐴) = 𝐴}
orbsta2.r	⊢ ∼ = (𝐺 ~_QG 𝐻)
orbsta2.o	⊢ 𝑂 = {⟨𝑥, 𝑦⟩ ∣ ({𝑥, 𝑦} ⊆ 𝑌 ∧ ∃𝑔 ∈ 𝑋 (𝑔 ⊕ 𝑥) = 𝑦)}

**Assertion**
Ref	Expression
orbsta2	⊢ ((( ⊕ ∈ (𝐺 GrpAct 𝑌) ∧ 𝐴 ∈ 𝑌) ∧ 𝑋 ∈ Fin) → (♯‘𝑋) = ((♯‘[𝐴]𝑂) · (♯‘𝐻)))

Distinct variable groups: 𝑢,𝑔,𝑥,𝑦, ⊕ 𝐴,𝑔,𝑢,𝑥,𝑦 𝑔,𝐺,𝑢,𝑥,𝑦 𝑔,𝑌,𝑥,𝑦 ∼ ,𝑔,𝑥,𝑦 𝑥,𝐻,𝑦 𝑔,𝑋,𝑢,𝑥,𝑦 Allowed substitution hints: ∼ (𝑢) 𝐻(𝑢,𝑔) 𝑂(𝑥,𝑦,𝑢,𝑔) 𝑌(𝑢)

Proof of Theorem orbsta2 Dummy variable 𝑘 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		orbsta2.x	. . 3 ⊢ 𝑋 = (Base‘𝐺)
2		orbsta2.r	. . 3 ⊢ ∼ = (𝐺 ~_QG 𝐻)
3		orbsta2.h	. . . . 5 ⊢ 𝐻 = {𝑢 ∈ 𝑋 ∣ (𝑢 ⊕ 𝐴) = 𝐴}
4	1, 3	gastacl 19282	. . . 4 ⊢ (( ⊕ ∈ (𝐺 GrpAct 𝑌) ∧ 𝐴 ∈ 𝑌) → 𝐻 ∈ (SubGrp‘𝐺))
5	4	adantr 481	. . 3 ⊢ ((( ⊕ ∈ (𝐺 GrpAct 𝑌) ∧ 𝐴 ∈ 𝑌) ∧ 𝑋 ∈ Fin) → 𝐻 ∈ (SubGrp‘𝐺))
6		simpr 485	. . 3 ⊢ ((( ⊕ ∈ (𝐺 GrpAct 𝑌) ∧ 𝐴 ∈ 𝑌) ∧ 𝑋 ∈ Fin) → 𝑋 ∈ Fin)
7	1, 2, 5, 6	lagsubg2 19167	. 2 ⊢ ((( ⊕ ∈ (𝐺 GrpAct 𝑌) ∧ 𝐴 ∈ 𝑌) ∧ 𝑋 ∈ Fin) → (♯‘𝑋) = ((♯‘(𝑋 / ∼ )) · (♯‘𝐻)))
8		pwfi 9226	. . . . . 6 ⊢ (𝑋 ∈ Fin ↔ 𝒫 𝑋 ∈ Fin)
9	8	bilani 505	. . . . 5 ⊢ ((( ⊕ ∈ (𝐺 GrpAct 𝑌) ∧ 𝐴 ∈ 𝑌) ∧ 𝑋 ∈ Fin) → 𝒫 𝑋 ∈ Fin)
10	1, 2	eqger 19151	. . . . . . 7 ⊢ (𝐻 ∈ (SubGrp‘𝐺) → ∼ Er 𝑋)
11	5, 10	syl 17	. . . . . 6 ⊢ ((( ⊕ ∈ (𝐺 GrpAct 𝑌) ∧ 𝐴 ∈ 𝑌) ∧ 𝑋 ∈ Fin) → ∼ Er 𝑋)
12	11	qsss 8719	. . . . 5 ⊢ ((( ⊕ ∈ (𝐺 GrpAct 𝑌) ∧ 𝐴 ∈ 𝑌) ∧ 𝑋 ∈ Fin) → (𝑋 / ∼ ) ⊆ 𝒫 𝑋)
13	9, 12	ssfid 9176	. . . 4 ⊢ ((( ⊕ ∈ (𝐺 GrpAct 𝑌) ∧ 𝐴 ∈ 𝑌) ∧ 𝑋 ∈ Fin) → (𝑋 / ∼ ) ∈ Fin)
14		eqid 2740	. . . . . 6 ⊢ ran (𝑘 ∈ 𝑋 ↦ ⟨[𝑘] ∼ , (𝑘 ⊕ 𝐴)⟩) = ran (𝑘 ∈ 𝑋 ↦ ⟨[𝑘] ∼ , (𝑘 ⊕ 𝐴)⟩)
15		orbsta2.o	. . . . . 6 ⊢ 𝑂 = {⟨𝑥, 𝑦⟩ ∣ ({𝑥, 𝑦} ⊆ 𝑌 ∧ ∃𝑔 ∈ 𝑋 (𝑔 ⊕ 𝑥) = 𝑦)}
16	1, 3, 2, 14, 15	orbsta 19286	. . . . 5 ⊢ (( ⊕ ∈ (𝐺 GrpAct 𝑌) ∧ 𝐴 ∈ 𝑌) → ran (𝑘 ∈ 𝑋 ↦ ⟨[𝑘] ∼ , (𝑘 ⊕ 𝐴)⟩):(𝑋 / ∼ )–1-1-onto→[𝐴]𝑂)
17	16	adantr 481	. . . 4 ⊢ ((( ⊕ ∈ (𝐺 GrpAct 𝑌) ∧ 𝐴 ∈ 𝑌) ∧ 𝑋 ∈ Fin) → ran (𝑘 ∈ 𝑋 ↦ ⟨[𝑘] ∼ , (𝑘 ⊕ 𝐴)⟩):(𝑋 / ∼ )–1-1-onto→[𝐴]𝑂)
18	13, 17	hasheqf1od 14313	. . 3 ⊢ ((( ⊕ ∈ (𝐺 GrpAct 𝑌) ∧ 𝐴 ∈ 𝑌) ∧ 𝑋 ∈ Fin) → (♯‘(𝑋 / ∼ )) = (♯‘[𝐴]𝑂))
19	18	oveq1d 7378	. 2 ⊢ ((( ⊕ ∈ (𝐺 GrpAct 𝑌) ∧ 𝐴 ∈ 𝑌) ∧ 𝑋 ∈ Fin) → ((♯‘(𝑋 / ∼ )) · (♯‘𝐻)) = ((♯‘[𝐴]𝑂) · (♯‘𝐻)))
20	7, 19	eqtrd 2775	1 ⊢ ((( ⊕ ∈ (𝐺 GrpAct 𝑌) ∧ 𝐴 ∈ 𝑌) ∧ 𝑋 ∈ Fin) → (♯‘𝑋) = ((♯‘[𝐴]𝑂) · (♯‘𝐻)))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ wa 396 = wceq 1547 ∈ wcel 2119 ∃wrex 3064 {crab 3392 ⊆ wss 3890 𝒫 cpw 4536 {cpr 4564 ⟨cop 4568 {copab 5141 ↦ cmpt 5160 ran crn 5626 –1-1-onto→wf1o 6491 ‘cfv 6492 (class class class)co 7363 Er wer 8637 [cec 8638 / cqs 8639 Fincfn 8890 · cmul 11041 ♯chash 14290 Basecbs 17177 SubGrpcsubg 19094 ~_QG cqg 19096 GrpAct cga 19262

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1802 ax-4 1816 ax-5 1917 ax-6 1974 ax-7 2015 ax-8 2121 ax-9 2129 ax-10 2152 ax-11 2168 ax-12 2189 ax-ext 2712 ax-rep 5206 ax-sep 5225 ax-nul 5235 ax-pow 5301 ax-pr 5369 ax-un 7685 ax-inf2 9560 ax-cnex 11092 ax-resscn 11093 ax-1cn 11094 ax-icn 11095 ax-addcl 11096 ax-addrcl 11097 ax-mulcl 11098 ax-mulrcl 11099 ax-mulcom 11100 ax-addass 11101 ax-mulass 11102 ax-distr 11103 ax-i2m1 11104 ax-1ne0 11105 ax-1rid 11106 ax-rnegex 11107 ax-rrecex 11108 ax-cnre 11109 ax-pre-lttri 11110 ax-pre-lttrn 11111 ax-pre-ltadd 11112 ax-pre-mulgt0 11113 ax-pre-sup 11114

This theorem depends on definitions: df-bi 208 df-an 397 df-or 854 df-3or 1093 df-3an 1094 df-tru 1550 df-fal 1560 df-ex 1787 df-nf 1791 df-sb 2074 df-mo 2543 df-eu 2573 df-clab 2719 df-cleq 2732 df-clel 2815 df-nfc 2889 df-ne 2936 df-nel 3040 df-ral 3055 df-rex 3065 df-rmo 3345 df-reu 3346 df-rab 3393 df-v 3434 df-sbc 3731 df-csb 3839 df-dif 3893 df-un 3895 df-in 3897 df-ss 3907 df-pss 3910 df-nul 4269 df-if 4462 df-pw 4538 df-sn 4563 df-pr 4565 df-op 4569 df-uni 4846 df-int 4885 df-iun 4930 df-disj 5047 df-br 5080 df-opab 5142 df-mpt 5161 df-tr 5187 df-id 5520 df-eprel 5525 df-po 5533 df-so 5534 df-fr 5578 df-se 5579 df-we 5580 df-xp 5631 df-rel 5632 df-cnv 5633 df-co 5634 df-dm 5635 df-rn 5636 df-res 5637 df-ima 5638 df-pred 6259 df-ord 6320 df-on 6321 df-lim 6322 df-suc 6323 df-iota 6448 df-fun 6494 df-fn 6495 df-f 6496 df-f1 6497 df-fo 6498 df-f1o 6499 df-fv 6500 df-isom 6501 df-riota 7320 df-ov 7366 df-oprab 7367 df-mpo 7368 df-om 7814 df-1st 7938 df-2nd 7939 df-frecs 8228 df-wrecs 8259 df-recs 8308 df-rdg 8346 df-1o 8402 df-er 8640 df-ec 8642 df-qs 8646 df-map 8772 df-en 8891 df-dom 8892 df-sdom 8893 df-fin 8894 df-sup 9352 df-oi 9422 df-card 9861 df-pnf 11179 df-mnf 11180 df-xr 11181 df-ltxr 11182 df-le 11183 df-sub 11377 df-neg 11378 df-div 11806 df-nn 12173 df-2 12242 df-3 12243 df-n0 12436 df-z 12523 df-uz 12787 df-rp 12941 df-fz 13460 df-fzo 13607 df-seq 13962 df-exp 14022 df-hash 14291 df-cj 15059 df-re 15060 df-im 15061 df-sqrt 15195 df-abs 15196 df-clim 15448 df-sum 15647 df-sets 17132 df-slot 17150 df-ndx 17162 df-base 17178 df-ress 17199 df-plusg 17231 df-0g 17402 df-mgm 18606 df-sgrp 18685 df-mnd 18701 df-grp 18910 df-minusg 18911 df-subg 19097 df-eqg 19099 df-ga 19263

This theorem is referenced by: sylow1lem5 19575 sylow2alem2 19591 sylow3lem3 19602

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