sylow3lem4 - Metamath Proof Explorer

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Theorem sylow3lem4 19492

Description: Lemma for sylow3 19495, first part. The number of Sylow subgroups is a divisor of the size of 𝐺 reduced by the size of a Sylow subgroup of 𝐺. (Contributed by Mario Carneiro, 19-Jan-2015.)

**Hypotheses**
Ref	Expression
sylow3.x	⊢ 𝑋 = (Base‘𝐺)
sylow3.g	⊢ (𝜑 → 𝐺 ∈ Grp)
sylow3.xf	⊢ (𝜑 → 𝑋 ∈ Fin)
sylow3.p	⊢ (𝜑 → 𝑃 ∈ ℙ)
sylow3lem1.a	⊢ + = (+_g‘𝐺)
sylow3lem1.d	⊢ − = (-_g‘𝐺)
sylow3lem1.m	⊢ ⊕ = (𝑥 ∈ 𝑋, 𝑦 ∈ (𝑃 pSyl 𝐺) ↦ ran (𝑧 ∈ 𝑦 ↦ ((𝑥 + 𝑧) − 𝑥)))
sylow3lem2.k	⊢ (𝜑 → 𝐾 ∈ (𝑃 pSyl 𝐺))
sylow3lem2.h	⊢ 𝐻 = {𝑢 ∈ 𝑋 ∣ (𝑢 ⊕ 𝐾) = 𝐾}
sylow3lem2.n	⊢ 𝑁 = {𝑥 ∈ 𝑋 ∣ ∀𝑦 ∈ 𝑋 ((𝑥 + 𝑦) ∈ 𝐾 ↔ (𝑦 + 𝑥) ∈ 𝐾)}

**Assertion**
Ref	Expression
sylow3lem4	⊢ (𝜑 → (♯‘(𝑃 pSyl 𝐺)) ∥ ((♯‘𝑋) / (𝑃↑(𝑃 pCnt (♯‘𝑋)))))

Distinct variable groups: 𝑥,𝑢,𝑦,𝑧, − 𝑢, ⊕ ,𝑥,𝑦,𝑧 𝑥,𝐻,𝑦 𝑢,𝐾,𝑥,𝑦,𝑧 𝑢,𝑁,𝑧 𝑢,𝑋,𝑥,𝑦,𝑧 𝑢,𝐺,𝑥,𝑦,𝑧 𝜑,𝑢,𝑥,𝑦,𝑧 𝑢, + ,𝑥,𝑦,𝑧 𝑢,𝑃,𝑥,𝑦,𝑧 Allowed substitution hints: 𝐻(𝑧,𝑢) 𝑁(𝑥,𝑦)

**Proof of Theorem sylow3lem4**
Step	Hyp	Ref	Expression
1		sylow3.x	. . 3 ⊢ 𝑋 = (Base‘𝐺)
2		sylow3.g	. . 3 ⊢ (𝜑 → 𝐺 ∈ Grp)
3		sylow3.xf	. . 3 ⊢ (𝜑 → 𝑋 ∈ Fin)
4		sylow3.p	. . 3 ⊢ (𝜑 → 𝑃 ∈ ℙ)
5		sylow3lem1.a	. . 3 ⊢ + = (+_g‘𝐺)
6		sylow3lem1.d	. . 3 ⊢ − = (-_g‘𝐺)
7		sylow3lem1.m	. . 3 ⊢ ⊕ = (𝑥 ∈ 𝑋, 𝑦 ∈ (𝑃 pSyl 𝐺) ↦ ran (𝑧 ∈ 𝑦 ↦ ((𝑥 + 𝑧) − 𝑥)))
8		sylow3lem2.k	. . 3 ⊢ (𝜑 → 𝐾 ∈ (𝑃 pSyl 𝐺))
9		sylow3lem2.h	. . 3 ⊢ 𝐻 = {𝑢 ∈ 𝑋 ∣ (𝑢 ⊕ 𝐾) = 𝐾}
10		sylow3lem2.n	. . 3 ⊢ 𝑁 = {𝑥 ∈ 𝑋 ∣ ∀𝑦 ∈ 𝑋 ((𝑥 + 𝑦) ∈ 𝐾 ↔ (𝑦 + 𝑥) ∈ 𝐾)}
11	1, 2, 3, 4, 5, 6, 7, 8, 9, 10	sylow3lem3 19491	. 2 ⊢ (𝜑 → (♯‘(𝑃 pSyl 𝐺)) = (♯‘(𝑋 / (𝐺 ~_QG 𝑁))))
12		slwsubg 19472	. . . . . . . . . 10 ⊢ (𝐾 ∈ (𝑃 pSyl 𝐺) → 𝐾 ∈ (SubGrp‘𝐺))
13	8, 12	syl 17	. . . . . . . . 9 ⊢ (𝜑 → 𝐾 ∈ (SubGrp‘𝐺))
14		eqid 2732	. . . . . . . . . . 11 ⊢ (𝐺 ↾_s 𝑁) = (𝐺 ↾_s 𝑁)
15	10, 1, 5, 14	nmznsg 19042	. . . . . . . . . 10 ⊢ (𝐾 ∈ (SubGrp‘𝐺) → 𝐾 ∈ (NrmSGrp‘(𝐺 ↾_s 𝑁)))
16		nsgsubg 19032	. . . . . . . . . 10 ⊢ (𝐾 ∈ (NrmSGrp‘(𝐺 ↾_s 𝑁)) → 𝐾 ∈ (SubGrp‘(𝐺 ↾_s 𝑁)))
17	15, 16	syl 17	. . . . . . . . 9 ⊢ (𝐾 ∈ (SubGrp‘𝐺) → 𝐾 ∈ (SubGrp‘(𝐺 ↾_s 𝑁)))
18	13, 17	syl 17	. . . . . . . 8 ⊢ (𝜑 → 𝐾 ∈ (SubGrp‘(𝐺 ↾_s 𝑁)))
19	10, 1, 5	nmzsubg 19039	. . . . . . . . . . 11 ⊢ (𝐺 ∈ Grp → 𝑁 ∈ (SubGrp‘𝐺))
20	2, 19	syl 17	. . . . . . . . . 10 ⊢ (𝜑 → 𝑁 ∈ (SubGrp‘𝐺))
21	14	subgbas 19004	. . . . . . . . . 10 ⊢ (𝑁 ∈ (SubGrp‘𝐺) → 𝑁 = (Base‘(𝐺 ↾_s 𝑁)))
22	20, 21	syl 17	. . . . . . . . 9 ⊢ (𝜑 → 𝑁 = (Base‘(𝐺 ↾_s 𝑁)))
23	1	subgss 19001	. . . . . . . . . . 11 ⊢ (𝑁 ∈ (SubGrp‘𝐺) → 𝑁 ⊆ 𝑋)
24	20, 23	syl 17	. . . . . . . . . 10 ⊢ (𝜑 → 𝑁 ⊆ 𝑋)
25	3, 24	ssfid 9263	. . . . . . . . 9 ⊢ (𝜑 → 𝑁 ∈ Fin)
26	22, 25	eqeltrrd 2834	. . . . . . . 8 ⊢ (𝜑 → (Base‘(𝐺 ↾_s 𝑁)) ∈ Fin)
27		eqid 2732	. . . . . . . . 9 ⊢ (Base‘(𝐺 ↾_s 𝑁)) = (Base‘(𝐺 ↾_s 𝑁))
28	27	lagsubg 19066	. . . . . . . 8 ⊢ ((𝐾 ∈ (SubGrp‘(𝐺 ↾_s 𝑁)) ∧ (Base‘(𝐺 ↾_s 𝑁)) ∈ Fin) → (♯‘𝐾) ∥ (♯‘(Base‘(𝐺 ↾_s 𝑁))))
29	18, 26, 28	syl2anc 584	. . . . . . 7 ⊢ (𝜑 → (♯‘𝐾) ∥ (♯‘(Base‘(𝐺 ↾_s 𝑁))))
30	22	fveq2d 6892	. . . . . . 7 ⊢ (𝜑 → (♯‘𝑁) = (♯‘(Base‘(𝐺 ↾_s 𝑁))))
31	29, 30	breqtrrd 5175	. . . . . 6 ⊢ (𝜑 → (♯‘𝐾) ∥ (♯‘𝑁))
32		eqid 2732	. . . . . . . . . . . 12 ⊢ (0_g‘𝐺) = (0_g‘𝐺)
33	32	subg0cl 19008	. . . . . . . . . . 11 ⊢ (𝐾 ∈ (SubGrp‘𝐺) → (0_g‘𝐺) ∈ 𝐾)
34	13, 33	syl 17	. . . . . . . . . 10 ⊢ (𝜑 → (0_g‘𝐺) ∈ 𝐾)
35	34	ne0d 4334	. . . . . . . . 9 ⊢ (𝜑 → 𝐾 ≠ ∅)
36	1	subgss 19001	. . . . . . . . . . . 12 ⊢ (𝐾 ∈ (SubGrp‘𝐺) → 𝐾 ⊆ 𝑋)
37	13, 36	syl 17	. . . . . . . . . . 11 ⊢ (𝜑 → 𝐾 ⊆ 𝑋)
38	3, 37	ssfid 9263	. . . . . . . . . 10 ⊢ (𝜑 → 𝐾 ∈ Fin)
39		hashnncl 14322	. . . . . . . . . 10 ⊢ (𝐾 ∈ Fin → ((♯‘𝐾) ∈ ℕ ↔ 𝐾 ≠ ∅))
40	38, 39	syl 17	. . . . . . . . 9 ⊢ (𝜑 → ((♯‘𝐾) ∈ ℕ ↔ 𝐾 ≠ ∅))
41	35, 40	mpbird 256	. . . . . . . 8 ⊢ (𝜑 → (♯‘𝐾) ∈ ℕ)
42	41	nnzd 12581	. . . . . . 7 ⊢ (𝜑 → (♯‘𝐾) ∈ ℤ)
43		hashcl 14312	. . . . . . . . 9 ⊢ (𝑁 ∈ Fin → (♯‘𝑁) ∈ ℕ₀)
44	25, 43	syl 17	. . . . . . . 8 ⊢ (𝜑 → (♯‘𝑁) ∈ ℕ₀)
45	44	nn0zd 12580	. . . . . . 7 ⊢ (𝜑 → (♯‘𝑁) ∈ ℤ)
46		pwfi 9174	. . . . . . . . . . 11 ⊢ (𝑋 ∈ Fin ↔ 𝒫 𝑋 ∈ Fin)
47	3, 46	sylib 217	. . . . . . . . . 10 ⊢ (𝜑 → 𝒫 𝑋 ∈ Fin)
48		eqid 2732	. . . . . . . . . . . . 13 ⊢ (𝐺 ~_QG 𝑁) = (𝐺 ~_QG 𝑁)
49	1, 48	eqger 19052	. . . . . . . . . . . 12 ⊢ (𝑁 ∈ (SubGrp‘𝐺) → (𝐺 ~_QG 𝑁) Er 𝑋)
50	20, 49	syl 17	. . . . . . . . . . 11 ⊢ (𝜑 → (𝐺 ~_QG 𝑁) Er 𝑋)
51	50	qsss 8768	. . . . . . . . . 10 ⊢ (𝜑 → (𝑋 / (𝐺 ~_QG 𝑁)) ⊆ 𝒫 𝑋)
52	47, 51	ssfid 9263	. . . . . . . . 9 ⊢ (𝜑 → (𝑋 / (𝐺 ~_QG 𝑁)) ∈ Fin)
53		hashcl 14312	. . . . . . . . 9 ⊢ ((𝑋 / (𝐺 ~_QG 𝑁)) ∈ Fin → (♯‘(𝑋 / (𝐺 ~_QG 𝑁))) ∈ ℕ₀)
54	52, 53	syl 17	. . . . . . . 8 ⊢ (𝜑 → (♯‘(𝑋 / (𝐺 ~_QG 𝑁))) ∈ ℕ₀)
55	54	nn0zd 12580	. . . . . . 7 ⊢ (𝜑 → (♯‘(𝑋 / (𝐺 ~_QG 𝑁))) ∈ ℤ)
56		dvdscmul 16222	. . . . . . 7 ⊢ (((♯‘𝐾) ∈ ℤ ∧ (♯‘𝑁) ∈ ℤ ∧ (♯‘(𝑋 / (𝐺 ~_QG 𝑁))) ∈ ℤ) → ((♯‘𝐾) ∥ (♯‘𝑁) → ((♯‘(𝑋 / (𝐺 ~_QG 𝑁))) · (♯‘𝐾)) ∥ ((♯‘(𝑋 / (𝐺 ~_QG 𝑁))) · (♯‘𝑁))))
57	42, 45, 55, 56	syl3anc 1371	. . . . . 6 ⊢ (𝜑 → ((♯‘𝐾) ∥ (♯‘𝑁) → ((♯‘(𝑋 / (𝐺 ~_QG 𝑁))) · (♯‘𝐾)) ∥ ((♯‘(𝑋 / (𝐺 ~_QG 𝑁))) · (♯‘𝑁))))
58	31, 57	mpd 15	. . . . 5 ⊢ (𝜑 → ((♯‘(𝑋 / (𝐺 ~_QG 𝑁))) · (♯‘𝐾)) ∥ ((♯‘(𝑋 / (𝐺 ~_QG 𝑁))) · (♯‘𝑁)))
59		hashcl 14312	. . . . . . . . 9 ⊢ (𝑋 ∈ Fin → (♯‘𝑋) ∈ ℕ₀)
60	3, 59	syl 17	. . . . . . . 8 ⊢ (𝜑 → (♯‘𝑋) ∈ ℕ₀)
61	60	nn0cnd 12530	. . . . . . 7 ⊢ (𝜑 → (♯‘𝑋) ∈ ℂ)
62	41	nncnd 12224	. . . . . . 7 ⊢ (𝜑 → (♯‘𝐾) ∈ ℂ)
63	41	nnne0d 12258	. . . . . . 7 ⊢ (𝜑 → (♯‘𝐾) ≠ 0)
64	61, 62, 63	divcan1d 11987	. . . . . 6 ⊢ (𝜑 → (((♯‘𝑋) / (♯‘𝐾)) · (♯‘𝐾)) = (♯‘𝑋))
65	1, 48, 20, 3	lagsubg2 19065	. . . . . 6 ⊢ (𝜑 → (♯‘𝑋) = ((♯‘(𝑋 / (𝐺 ~_QG 𝑁))) · (♯‘𝑁)))
66	64, 65	eqtrd 2772	. . . . 5 ⊢ (𝜑 → (((♯‘𝑋) / (♯‘𝐾)) · (♯‘𝐾)) = ((♯‘(𝑋 / (𝐺 ~_QG 𝑁))) · (♯‘𝑁)))
67	58, 66	breqtrrd 5175	. . . 4 ⊢ (𝜑 → ((♯‘(𝑋 / (𝐺 ~_QG 𝑁))) · (♯‘𝐾)) ∥ (((♯‘𝑋) / (♯‘𝐾)) · (♯‘𝐾)))
68	1	lagsubg 19066	. . . . . . 7 ⊢ ((𝐾 ∈ (SubGrp‘𝐺) ∧ 𝑋 ∈ Fin) → (♯‘𝐾) ∥ (♯‘𝑋))
69	13, 3, 68	syl2anc 584	. . . . . 6 ⊢ (𝜑 → (♯‘𝐾) ∥ (♯‘𝑋))
70	60	nn0zd 12580	. . . . . . 7 ⊢ (𝜑 → (♯‘𝑋) ∈ ℤ)
71		dvdsval2 16196	. . . . . . 7 ⊢ (((♯‘𝐾) ∈ ℤ ∧ (♯‘𝐾) ≠ 0 ∧ (♯‘𝑋) ∈ ℤ) → ((♯‘𝐾) ∥ (♯‘𝑋) ↔ ((♯‘𝑋) / (♯‘𝐾)) ∈ ℤ))
72	42, 63, 70, 71	syl3anc 1371	. . . . . 6 ⊢ (𝜑 → ((♯‘𝐾) ∥ (♯‘𝑋) ↔ ((♯‘𝑋) / (♯‘𝐾)) ∈ ℤ))
73	69, 72	mpbid 231	. . . . 5 ⊢ (𝜑 → ((♯‘𝑋) / (♯‘𝐾)) ∈ ℤ)
74		dvdsmulcr 16225	. . . . 5 ⊢ (((♯‘(𝑋 / (𝐺 ~_QG 𝑁))) ∈ ℤ ∧ ((♯‘𝑋) / (♯‘𝐾)) ∈ ℤ ∧ ((♯‘𝐾) ∈ ℤ ∧ (♯‘𝐾) ≠ 0)) → (((♯‘(𝑋 / (𝐺 ~_QG 𝑁))) · (♯‘𝐾)) ∥ (((♯‘𝑋) / (♯‘𝐾)) · (♯‘𝐾)) ↔ (♯‘(𝑋 / (𝐺 ~_QG 𝑁))) ∥ ((♯‘𝑋) / (♯‘𝐾))))
75	55, 73, 42, 63, 74	syl112anc 1374	. . . 4 ⊢ (𝜑 → (((♯‘(𝑋 / (𝐺 ~_QG 𝑁))) · (♯‘𝐾)) ∥ (((♯‘𝑋) / (♯‘𝐾)) · (♯‘𝐾)) ↔ (♯‘(𝑋 / (𝐺 ~_QG 𝑁))) ∥ ((♯‘𝑋) / (♯‘𝐾))))
76	67, 75	mpbid 231	. . 3 ⊢ (𝜑 → (♯‘(𝑋 / (𝐺 ~_QG 𝑁))) ∥ ((♯‘𝑋) / (♯‘𝐾)))
77	1, 3, 8	slwhash 19486	. . . 4 ⊢ (𝜑 → (♯‘𝐾) = (𝑃↑(𝑃 pCnt (♯‘𝑋))))
78	77	oveq2d 7421	. . 3 ⊢ (𝜑 → ((♯‘𝑋) / (♯‘𝐾)) = ((♯‘𝑋) / (𝑃↑(𝑃 pCnt (♯‘𝑋)))))
79	76, 78	breqtrd 5173	. 2 ⊢ (𝜑 → (♯‘(𝑋 / (𝐺 ~_QG 𝑁))) ∥ ((♯‘𝑋) / (𝑃↑(𝑃 pCnt (♯‘𝑋)))))
80	11, 79	eqbrtrd 5169	1 ⊢ (𝜑 → (♯‘(𝑃 pSyl 𝐺)) ∥ ((♯‘𝑋) / (𝑃↑(𝑃 pCnt (♯‘𝑋)))))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 205 = wceq 1541 ∈ wcel 2106 ≠ wne 2940 ∀wral 3061 {crab 3432 ⊆ wss 3947 ∅c0 4321 𝒫 cpw 4601 class class class wbr 5147 ↦ cmpt 5230 ran crn 5676 ‘cfv 6540 (class class class)co 7405 ∈ cmpo 7407 Er wer 8696 / cqs 8698 Fincfn 8935 0cc0 11106 · cmul 11111 / cdiv 11867 ℕcn 12208 ℕ₀cn0 12468 ℤcz 12554 ↑cexp 14023 ♯chash 14286 ∥ cdvds 16193 ℙcprime 16604 pCnt cpc 16765 Basecbs 17140 ↾_s cress 17169 +_gcplusg 17193 0_gc0g 17381 Grpcgrp 18815 -_gcsg 18817 SubGrpcsubg 18994 NrmSGrpcnsg 18995 ~_QG cqg 18996 pSyl cslw 19389

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1913 ax-6 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-10 2137 ax-11 2154 ax-12 2171 ax-ext 2703 ax-rep 5284 ax-sep 5298 ax-nul 5305 ax-pow 5362 ax-pr 5426 ax-un 7721 ax-inf2 9632 ax-cnex 11162 ax-resscn 11163 ax-1cn 11164 ax-icn 11165 ax-addcl 11166 ax-addrcl 11167 ax-mulcl 11168 ax-mulrcl 11169 ax-mulcom 11170 ax-addass 11171 ax-mulass 11172 ax-distr 11173 ax-i2m1 11174 ax-1ne0 11175 ax-1rid 11176 ax-rnegex 11177 ax-rrecex 11178 ax-cnre 11179 ax-pre-lttri 11180 ax-pre-lttrn 11181 ax-pre-ltadd 11182 ax-pre-mulgt0 11183 ax-pre-sup 11184

This theorem depends on definitions: df-bi 206 df-an 397 df-or 846 df-3or 1088 df-3an 1089 df-tru 1544 df-fal 1554 df-ex 1782 df-nf 1786 df-sb 2068 df-mo 2534 df-eu 2563 df-clab 2710 df-cleq 2724 df-clel 2810 df-nfc 2885 df-ne 2941 df-nel 3047 df-ral 3062 df-rex 3071 df-rmo 3376 df-reu 3377 df-rab 3433 df-v 3476 df-sbc 3777 df-csb 3893 df-dif 3950 df-un 3952 df-in 3954 df-ss 3964 df-pss 3966 df-nul 4322 df-if 4528 df-pw 4603 df-sn 4628 df-pr 4630 df-op 4634 df-uni 4908 df-int 4950 df-iun 4998 df-disj 5113 df-br 5148 df-opab 5210 df-mpt 5231 df-tr 5265 df-id 5573 df-eprel 5579 df-po 5587 df-so 5588 df-fr 5630 df-se 5631 df-we 5632 df-xp 5681 df-rel 5682 df-cnv 5683 df-co 5684 df-dm 5685 df-rn 5686 df-res 5687 df-ima 5688 df-pred 6297 df-ord 6364 df-on 6365 df-lim 6366 df-suc 6367 df-iota 6492 df-fun 6542 df-fn 6543 df-f 6544 df-f1 6545 df-fo 6546 df-f1o 6547 df-fv 6548 df-isom 6549 df-riota 7361 df-ov 7408 df-oprab 7409 df-mpo 7410 df-om 7852 df-1st 7971 df-2nd 7972 df-frecs 8262 df-wrecs 8293 df-recs 8367 df-rdg 8406 df-1o 8462 df-2o 8463 df-oadd 8466 df-omul 8467 df-er 8699 df-ec 8701 df-qs 8705 df-map 8818 df-en 8936 df-dom 8937 df-sdom 8938 df-fin 8939 df-sup 9433 df-inf 9434 df-oi 9501 df-dju 9892 df-card 9930 df-acn 9933 df-pnf 11246 df-mnf 11247 df-xr 11248 df-ltxr 11249 df-le 11250 df-sub 11442 df-neg 11443 df-div 11868 df-nn 12209 df-2 12271 df-3 12272 df-n0 12469 df-xnn0 12541 df-z 12555 df-uz 12819 df-q 12929 df-rp 12971 df-fz 13481 df-fzo 13624 df-fl 13753 df-mod 13831 df-seq 13963 df-exp 14024 df-fac 14230 df-bc 14259 df-hash 14287 df-cj 15042 df-re 15043 df-im 15044 df-sqrt 15178 df-abs 15179 df-clim 15428 df-sum 15629 df-dvds 16194 df-gcd 16432 df-prm 16605 df-pc 16766 df-sets 17093 df-slot 17111 df-ndx 17123 df-base 17141 df-ress 17170 df-plusg 17206 df-0g 17383 df-mgm 18557 df-sgrp 18606 df-mnd 18622 df-submnd 18668 df-grp 18818 df-minusg 18819 df-sbg 18820 df-mulg 18945 df-subg 18997 df-nsg 18998 df-eqg 18999 df-ghm 19084 df-ga 19148 df-od 19390 df-pgp 19392 df-slw 19393

This theorem is referenced by: sylow3 19495

W3C validator