Theorem sylow2alem1 19603

Description: Lemma for sylow2a 19605. An equivalence class of fixed points is a singleton. (Contributed by Mario Carneiro, 17-Jan-2015.)

Hypotheses

Ref	Expression
sylow2a.x	⊢ 𝑋 = (Base‘𝐺)
sylow2a.m	⊢ (𝜑 → ⊕ ∈ (𝐺 GrpAct 𝑌))
sylow2a.p	⊢ (𝜑 → 𝑃 pGrp 𝐺)
sylow2a.f	⊢ (𝜑 → 𝑋 ∈ Fin)
sylow2a.y	⊢ (𝜑 → 𝑌 ∈ Fin)
sylow2a.z	⊢ 𝑍 = {𝑢 ∈ 𝑌 ∣ ∀ℎ ∈ 𝑋 (ℎ ⊕ 𝑢) = 𝑢}
sylow2a.r	⊢ ∼ = {⟨𝑥, 𝑦⟩ ∣ ({𝑥, 𝑦} ⊆ 𝑌 ∧ ∃𝑔 ∈ 𝑋 (𝑔 ⊕ 𝑥) = 𝑦)}

Assertion

Ref	Expression
sylow2alem1	⊢ ((𝜑 ∧ 𝐴 ∈ 𝑍) → [𝐴] ∼ = {𝐴})

Distinct variable groups:   ∼ ,ℎ   𝑔,ℎ,𝑢,𝑥,𝑦,𝐴   𝑔,𝐺,𝑥,𝑦   ⊕ ,𝑔,ℎ,𝑢,𝑥,𝑦   𝑔,𝑋,ℎ,𝑢,𝑥,𝑦   𝜑,ℎ   𝑔,𝑌,ℎ,𝑢,𝑥,𝑦

Allowed substitution hints:   𝜑(𝑥,𝑦,𝑢,𝑔)   𝑃(𝑥,𝑦,𝑢,𝑔,ℎ)   ∼ (𝑥,𝑦,𝑢,𝑔)   𝐺(𝑢,ℎ)   𝑍(𝑥,𝑦,𝑢,𝑔,ℎ)

Proof of Theorem sylow2alem1

Dummy variables 𝑘 𝑤 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		vex 3468	. . . . . 6 ⊢ 𝑤 ∈ V
2		simpr 484	. . . . . 6 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑍) → 𝐴 ∈ 𝑍)
3		elecg 8768	. . . . . 6 ⊢ ((𝑤 ∈ V ∧ 𝐴 ∈ 𝑍) → (𝑤 ∈ [𝐴] ∼ ↔ 𝐴 ∼ 𝑤))
4	1, 2, 3	sylancr 587	. . . . 5 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑍) → (𝑤 ∈ [𝐴] ∼ ↔ 𝐴 ∼ 𝑤))
5		sylow2a.r	. . . . . . . 8 ⊢ ∼ = {⟨𝑥, 𝑦⟩ ∣ ({𝑥, 𝑦} ⊆ 𝑌 ∧ ∃𝑔 ∈ 𝑋 (𝑔 ⊕ 𝑥) = 𝑦)}
6	5	gaorb 19295	. . . . . . 7 ⊢ (𝐴 ∼ 𝑤 ↔ (𝐴 ∈ 𝑌 ∧ 𝑤 ∈ 𝑌 ∧ ∃𝑘 ∈ 𝑋 (𝑘 ⊕ 𝐴) = 𝑤))
7	6	simp3bi 1147	. . . . . 6 ⊢ (𝐴 ∼ 𝑤 → ∃𝑘 ∈ 𝑋 (𝑘 ⊕ 𝐴) = 𝑤)
8		oveq2 7418	. . . . . . . . . . . . . 14 ⊢ (𝑢 = 𝐴 → (ℎ ⊕ 𝑢) = (ℎ ⊕ 𝐴))
9		id 22	. . . . . . . . . . . . . 14 ⊢ (𝑢 = 𝐴 → 𝑢 = 𝐴)
10	8, 9	eqeq12d 2752	. . . . . . . . . . . . 13 ⊢ (𝑢 = 𝐴 → ((ℎ ⊕ 𝑢) = 𝑢 ↔ (ℎ ⊕ 𝐴) = 𝐴))
11	10	ralbidv 3164	. . . . . . . . . . . 12 ⊢ (𝑢 = 𝐴 → (∀ℎ ∈ 𝑋 (ℎ ⊕ 𝑢) = 𝑢 ↔ ∀ℎ ∈ 𝑋 (ℎ ⊕ 𝐴) = 𝐴))
12		sylow2a.z	. . . . . . . . . . . 12 ⊢ 𝑍 = {𝑢 ∈ 𝑌 ∣ ∀ℎ ∈ 𝑋 (ℎ ⊕ 𝑢) = 𝑢}
13	11, 12	elrab2 3679	. . . . . . . . . . 11 ⊢ (𝐴 ∈ 𝑍 ↔ (𝐴 ∈ 𝑌 ∧ ∀ℎ ∈ 𝑋 (ℎ ⊕ 𝐴) = 𝐴))
14	2, 13	sylib 218	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑍) → (𝐴 ∈ 𝑌 ∧ ∀ℎ ∈ 𝑋 (ℎ ⊕ 𝐴) = 𝐴))
15	14	simprd 495	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑍) → ∀ℎ ∈ 𝑋 (ℎ ⊕ 𝐴) = 𝐴)
16		oveq1 7417	. . . . . . . . . . 11 ⊢ (ℎ = 𝑘 → (ℎ ⊕ 𝐴) = (𝑘 ⊕ 𝐴))
17	16	eqeq1d 2738	. . . . . . . . . 10 ⊢ (ℎ = 𝑘 → ((ℎ ⊕ 𝐴) = 𝐴 ↔ (𝑘 ⊕ 𝐴) = 𝐴))
18	17	rspccva 3605	. . . . . . . . 9 ⊢ ((∀ℎ ∈ 𝑋 (ℎ ⊕ 𝐴) = 𝐴 ∧ 𝑘 ∈ 𝑋) → (𝑘 ⊕ 𝐴) = 𝐴)
19	15, 18	sylan 580	. . . . . . . 8 ⊢ (((𝜑 ∧ 𝐴 ∈ 𝑍) ∧ 𝑘 ∈ 𝑋) → (𝑘 ⊕ 𝐴) = 𝐴)
20		eqeq1 2740	. . . . . . . 8 ⊢ ((𝑘 ⊕ 𝐴) = 𝑤 → ((𝑘 ⊕ 𝐴) = 𝐴 ↔ 𝑤 = 𝐴))
21	19, 20	syl5ibcom 245	. . . . . . 7 ⊢ (((𝜑 ∧ 𝐴 ∈ 𝑍) ∧ 𝑘 ∈ 𝑋) → ((𝑘 ⊕ 𝐴) = 𝑤 → 𝑤 = 𝐴))
22	21	rexlimdva 3142	. . . . . 6 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑍) → (∃𝑘 ∈ 𝑋 (𝑘 ⊕ 𝐴) = 𝑤 → 𝑤 = 𝐴))
23	7, 22	syl5 34	. . . . 5 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑍) → (𝐴 ∼ 𝑤 → 𝑤 = 𝐴))
24	4, 23	sylbid 240	. . . 4 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑍) → (𝑤 ∈ [𝐴] ∼ → 𝑤 = 𝐴))
25		velsn 4622	. . . 4 ⊢ (𝑤 ∈ {𝐴} ↔ 𝑤 = 𝐴)
26	24, 25	imbitrrdi 252	. . 3 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑍) → (𝑤 ∈ [𝐴] ∼ → 𝑤 ∈ {𝐴}))
27	26	ssrdv 3969	. 2 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑍) → [𝐴] ∼ ⊆ {𝐴})
28		sylow2a.m	. . . . . . 7 ⊢ (𝜑 → ⊕ ∈ (𝐺 GrpAct 𝑌))
29		sylow2a.x	. . . . . . . 8 ⊢ 𝑋 = (Base‘𝐺)
30	5, 29	gaorber 19296	. . . . . . 7 ⊢ ( ⊕ ∈ (𝐺 GrpAct 𝑌) → ∼ Er 𝑌)
31	28, 30	syl 17	. . . . . 6 ⊢ (𝜑 → ∼ Er 𝑌)
32	31	adantr 480	. . . . 5 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑍) → ∼ Er 𝑌)
33	14	simpld 494	. . . . 5 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑍) → 𝐴 ∈ 𝑌)
34	32, 33	erref 8744	. . . 4 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑍) → 𝐴 ∼ 𝐴)
35		elecg 8768	. . . . 5 ⊢ ((𝐴 ∈ 𝑍 ∧ 𝐴 ∈ 𝑍) → (𝐴 ∈ [𝐴] ∼ ↔ 𝐴 ∼ 𝐴))
36	2, 35	sylancom 588	. . . 4 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑍) → (𝐴 ∈ [𝐴] ∼ ↔ 𝐴 ∼ 𝐴))
37	34, 36	mpbird 257	. . 3 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑍) → 𝐴 ∈ [𝐴] ∼ )
38	37	snssd 4790	. 2 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑍) → {𝐴} ⊆ [𝐴] ∼ )
39	27, 38	eqssd 3981	1 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑍) → [𝐴] ∼ = {𝐴})

Syntax hints:   → wi 4   ↔ wb 206   ∧ wa 395   = wceq 1540   ∈ wcel 2109  ∀wral 3052  ∃wrex 3061  {crab 3420  Vcvv 3464   ⊆ wss 3931  {csn 4606  {cpr 4608   class class class wbr 5124  {copab 5186  ‘cfv 6536  (class class class)co 7410   Er wer 8721  [cec 8722  Fincfn 8964  Basecbs 17233   GrpAct cga 19277   pGrp cpgp 19512

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 2708  ax-sep 5271  ax-nul 5281  ax-pow 5340  ax-pr 5407  ax-un 7734

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1543  df-fal 1553  df-ex 1780  df-nf 1784  df-sb 2066  df-mo 2540  df-eu 2569  df-clab 2715  df-cleq 2728  df-clel 2810  df-nfc 2886  df-ne 2934  df-ral 3053  df-rex 3062  df-rmo 3364  df-reu 3365  df-rab 3421  df-v 3466  df-sbc 3771  df-csb 3880  df-dif 3934  df-un 3936  df-in 3938  df-ss 3948  df-nul 4314  df-if 4506  df-pw 4582  df-sn 4607  df-pr 4609  df-op 4613  df-uni 4889  df-br 5125  df-opab 5187  df-mpt 5207  df-id 5553  df-xp 5665  df-rel 5666  df-cnv 5667  df-co 5668  df-dm 5669  df-rn 5670  df-res 5671  df-ima 5672  df-iota 6489  df-fun 6538  df-fn 6539  df-f 6540  df-fv 6544  df-riota 7367  df-ov 7413  df-oprab 7414  df-mpo 7415  df-er 8724  df-ec 8726  df-map 8847  df-0g 17460  df-mgm 18623  df-sgrp 18702  df-mnd 18718  df-grp 18924  df-minusg 18925  df-ga 19278

This theorem is referenced by:  sylow2alem2  19604  sylow2a  19605