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Theorem dmdprdd 19910

Description: Show that a given family is a direct product decomposition. (Contributed by Mario Carneiro, 25-Apr-2016.) (Revised by AV, 11-Jul-2019.)

**Hypotheses**
Ref	Expression
dmdprd.z	⊢ 𝑍 = (Cntz‘𝐺)
dmdprd.0	⊢ 0 = (0_g‘𝐺)
dmdprd.k	⊢ 𝐾 = (mrCls‘(SubGrp‘𝐺))
dmdprdd.1	⊢ (𝜑 → 𝐺 ∈ Grp)
dmdprdd.2	⊢ (𝜑 → 𝐼 ∈ 𝑉)
dmdprdd.3	⊢ (𝜑 → 𝑆:𝐼⟶(SubGrp‘𝐺))
dmdprdd.4	⊢ ((𝜑 ∧ (𝑥 ∈ 𝐼 ∧ 𝑦 ∈ 𝐼 ∧ 𝑥 ≠ 𝑦)) → (𝑆‘𝑥) ⊆ (𝑍‘(𝑆‘𝑦)))
dmdprdd.5	⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼) → ((𝑆‘𝑥) ∩ (𝐾‘∪ (𝑆 “ (𝐼 ∖ {𝑥})))) ⊆ { 0 })

**Assertion**
Ref	Expression
dmdprdd	⊢ (𝜑 → 𝐺dom DProd 𝑆)

Distinct variable groups: 𝑥,𝑦,𝐺 𝑥,𝐼,𝑦 𝜑,𝑥,𝑦 𝑥,𝑆,𝑦 𝑥,𝑉,𝑦 Allowed substitution hints: 𝐾(𝑥,𝑦) 0 (𝑥,𝑦) 𝑍(𝑥,𝑦)

**Proof of Theorem dmdprdd**
Step	Hyp	Ref	Expression
1		dmdprdd.1	. 2 ⊢ (𝜑 → 𝐺 ∈ Grp)
2		dmdprdd.3	. 2 ⊢ (𝜑 → 𝑆:𝐼⟶(SubGrp‘𝐺))
3		eldifsn 4790	. . . . . . 7 ⊢ (𝑦 ∈ (𝐼 ∖ {𝑥}) ↔ (𝑦 ∈ 𝐼 ∧ 𝑦 ≠ 𝑥))
4		necom 2994	. . . . . . . 8 ⊢ (𝑦 ≠ 𝑥 ↔ 𝑥 ≠ 𝑦)
5	4	anbi2i 623	. . . . . . 7 ⊢ ((𝑦 ∈ 𝐼 ∧ 𝑦 ≠ 𝑥) ↔ (𝑦 ∈ 𝐼 ∧ 𝑥 ≠ 𝑦))
6	3, 5	bitri 274	. . . . . 6 ⊢ (𝑦 ∈ (𝐼 ∖ {𝑥}) ↔ (𝑦 ∈ 𝐼 ∧ 𝑥 ≠ 𝑦))
7		dmdprdd.4	. . . . . . . 8 ⊢ ((𝜑 ∧ (𝑥 ∈ 𝐼 ∧ 𝑦 ∈ 𝐼 ∧ 𝑥 ≠ 𝑦)) → (𝑆‘𝑥) ⊆ (𝑍‘(𝑆‘𝑦)))
8	7	3exp2 1354	. . . . . . 7 ⊢ (𝜑 → (𝑥 ∈ 𝐼 → (𝑦 ∈ 𝐼 → (𝑥 ≠ 𝑦 → (𝑆‘𝑥) ⊆ (𝑍‘(𝑆‘𝑦))))))
9	8	imp4b 422	. . . . . 6 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼) → ((𝑦 ∈ 𝐼 ∧ 𝑥 ≠ 𝑦) → (𝑆‘𝑥) ⊆ (𝑍‘(𝑆‘𝑦))))
10	6, 9	biimtrid 241	. . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼) → (𝑦 ∈ (𝐼 ∖ {𝑥}) → (𝑆‘𝑥) ⊆ (𝑍‘(𝑆‘𝑦))))
11	10	ralrimiv 3145	. . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼) → ∀𝑦 ∈ (𝐼 ∖ {𝑥})(𝑆‘𝑥) ⊆ (𝑍‘(𝑆‘𝑦)))
12		dmdprdd.5	. . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼) → ((𝑆‘𝑥) ∩ (𝐾‘∪ (𝑆 “ (𝐼 ∖ {𝑥})))) ⊆ { 0 })
13	2	ffvelcdmda 7086	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼) → (𝑆‘𝑥) ∈ (SubGrp‘𝐺))
14		dmdprd.0	. . . . . . . . 9 ⊢ 0 = (0_g‘𝐺)
15	14	subg0cl 19050	. . . . . . . 8 ⊢ ((𝑆‘𝑥) ∈ (SubGrp‘𝐺) → 0 ∈ (𝑆‘𝑥))
16	13, 15	syl 17	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼) → 0 ∈ (𝑆‘𝑥))
17	1	adantr 481	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼) → 𝐺 ∈ Grp)
18		eqid 2732	. . . . . . . . . . 11 ⊢ (Base‘𝐺) = (Base‘𝐺)
19	18	subgacs 19077	. . . . . . . . . 10 ⊢ (𝐺 ∈ Grp → (SubGrp‘𝐺) ∈ (ACS‘(Base‘𝐺)))
20		acsmre 17600	. . . . . . . . . 10 ⊢ ((SubGrp‘𝐺) ∈ (ACS‘(Base‘𝐺)) → (SubGrp‘𝐺) ∈ (Moore‘(Base‘𝐺)))
21	17, 19, 20	3syl 18	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼) → (SubGrp‘𝐺) ∈ (Moore‘(Base‘𝐺)))
22		imassrn 6070	. . . . . . . . . . . 12 ⊢ (𝑆 “ (𝐼 ∖ {𝑥})) ⊆ ran 𝑆
23	2	frnd 6725	. . . . . . . . . . . . 13 ⊢ (𝜑 → ran 𝑆 ⊆ (SubGrp‘𝐺))
24	23	adantr 481	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼) → ran 𝑆 ⊆ (SubGrp‘𝐺))
25	22, 24	sstrid 3993	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼) → (𝑆 “ (𝐼 ∖ {𝑥})) ⊆ (SubGrp‘𝐺))
26		mresspw 17540	. . . . . . . . . . . 12 ⊢ ((SubGrp‘𝐺) ∈ (Moore‘(Base‘𝐺)) → (SubGrp‘𝐺) ⊆ 𝒫 (Base‘𝐺))
27	21, 26	syl 17	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼) → (SubGrp‘𝐺) ⊆ 𝒫 (Base‘𝐺))
28	25, 27	sstrd 3992	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼) → (𝑆 “ (𝐼 ∖ {𝑥})) ⊆ 𝒫 (Base‘𝐺))
29		sspwuni 5103	. . . . . . . . . 10 ⊢ ((𝑆 “ (𝐼 ∖ {𝑥})) ⊆ 𝒫 (Base‘𝐺) ↔ ∪ (𝑆 “ (𝐼 ∖ {𝑥})) ⊆ (Base‘𝐺))
30	28, 29	sylib 217	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼) → ∪ (𝑆 “ (𝐼 ∖ {𝑥})) ⊆ (Base‘𝐺))
31		dmdprd.k	. . . . . . . . . 10 ⊢ 𝐾 = (mrCls‘(SubGrp‘𝐺))
32	31	mrccl 17559	. . . . . . . . 9 ⊢ (((SubGrp‘𝐺) ∈ (Moore‘(Base‘𝐺)) ∧ ∪ (𝑆 “ (𝐼 ∖ {𝑥})) ⊆ (Base‘𝐺)) → (𝐾‘∪ (𝑆 “ (𝐼 ∖ {𝑥}))) ∈ (SubGrp‘𝐺))
33	21, 30, 32	syl2anc 584	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼) → (𝐾‘∪ (𝑆 “ (𝐼 ∖ {𝑥}))) ∈ (SubGrp‘𝐺))
34	14	subg0cl 19050	. . . . . . . 8 ⊢ ((𝐾‘∪ (𝑆 “ (𝐼 ∖ {𝑥}))) ∈ (SubGrp‘𝐺) → 0 ∈ (𝐾‘∪ (𝑆 “ (𝐼 ∖ {𝑥}))))
35	33, 34	syl 17	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼) → 0 ∈ (𝐾‘∪ (𝑆 “ (𝐼 ∖ {𝑥}))))
36	16, 35	elind 4194	. . . . . 6 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼) → 0 ∈ ((𝑆‘𝑥) ∩ (𝐾‘∪ (𝑆 “ (𝐼 ∖ {𝑥})))))
37	36	snssd 4812	. . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼) → { 0 } ⊆ ((𝑆‘𝑥) ∩ (𝐾‘∪ (𝑆 “ (𝐼 ∖ {𝑥})))))
38	12, 37	eqssd 3999	. . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼) → ((𝑆‘𝑥) ∩ (𝐾‘∪ (𝑆 “ (𝐼 ∖ {𝑥})))) = { 0 })
39	11, 38	jca 512	. . 3 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼) → (∀𝑦 ∈ (𝐼 ∖ {𝑥})(𝑆‘𝑥) ⊆ (𝑍‘(𝑆‘𝑦)) ∧ ((𝑆‘𝑥) ∩ (𝐾‘∪ (𝑆 “ (𝐼 ∖ {𝑥})))) = { 0 }))
40	39	ralrimiva 3146	. 2 ⊢ (𝜑 → ∀𝑥 ∈ 𝐼 (∀𝑦 ∈ (𝐼 ∖ {𝑥})(𝑆‘𝑥) ⊆ (𝑍‘(𝑆‘𝑦)) ∧ ((𝑆‘𝑥) ∩ (𝐾‘∪ (𝑆 “ (𝐼 ∖ {𝑥})))) = { 0 }))
41		dmdprdd.2	. . 3 ⊢ (𝜑 → 𝐼 ∈ 𝑉)
42	2	fdmd 6728	. . 3 ⊢ (𝜑 → dom 𝑆 = 𝐼)
43		dmdprd.z	. . . 4 ⊢ 𝑍 = (Cntz‘𝐺)
44	43, 14, 31	dmdprd 19909	. . 3 ⊢ ((𝐼 ∈ 𝑉 ∧ dom 𝑆 = 𝐼) → (𝐺dom DProd 𝑆 ↔ (𝐺 ∈ Grp ∧ 𝑆:𝐼⟶(SubGrp‘𝐺) ∧ ∀𝑥 ∈ 𝐼 (∀𝑦 ∈ (𝐼 ∖ {𝑥})(𝑆‘𝑥) ⊆ (𝑍‘(𝑆‘𝑦)) ∧ ((𝑆‘𝑥) ∩ (𝐾‘∪ (𝑆 “ (𝐼 ∖ {𝑥})))) = { 0 }))))
45	41, 42, 44	syl2anc 584	. 2 ⊢ (𝜑 → (𝐺dom DProd 𝑆 ↔ (𝐺 ∈ Grp ∧ 𝑆:𝐼⟶(SubGrp‘𝐺) ∧ ∀𝑥 ∈ 𝐼 (∀𝑦 ∈ (𝐼 ∖ {𝑥})(𝑆‘𝑥) ⊆ (𝑍‘(𝑆‘𝑦)) ∧ ((𝑆‘𝑥) ∩ (𝐾‘∪ (𝑆 “ (𝐼 ∖ {𝑥})))) = { 0 }))))
46	1, 2, 40, 45	mpbir3and 1342	1 ⊢ (𝜑 → 𝐺dom DProd 𝑆)

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 205 ∧ wa 396 ∧ w3a 1087 = wceq 1541 ∈ wcel 2106 ≠ wne 2940 ∀wral 3061 ∖ cdif 3945 ∩ cin 3947 ⊆ wss 3948 𝒫 cpw 4602 {csn 4628 ∪ cuni 4908 class class class wbr 5148 dom cdm 5676 ran crn 5677 “ cima 5679 ⟶wf 6539 ‘cfv 6543 Basecbs 17148 0_gc0g 17389 Moorecmre 17530 mrClscmrc 17531 ACScacs 17533 Grpcgrp 18855 SubGrpcsubg 19036 Cntzccntz 19220 DProd cdprd 19904

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 5285 ax-sep 5299 ax-nul 5306 ax-pow 5363 ax-pr 5427 ax-un 7727 ax-cnex 11168 ax-resscn 11169 ax-1cn 11170 ax-icn 11171 ax-addcl 11172 ax-addrcl 11173 ax-mulcl 11174 ax-mulrcl 11175 ax-mulcom 11176 ax-addass 11177 ax-mulass 11178 ax-distr 11179 ax-i2m1 11180 ax-1ne0 11181 ax-1rid 11182 ax-rnegex 11183 ax-rrecex 11184 ax-cnre 11185 ax-pre-lttri 11186 ax-pre-lttrn 11187 ax-pre-ltadd 11188 ax-pre-mulgt0 11189

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 3778 df-csb 3894 df-dif 3951 df-un 3953 df-in 3955 df-ss 3965 df-pss 3967 df-nul 4323 df-if 4529 df-pw 4604 df-sn 4629 df-pr 4631 df-op 4635 df-uni 4909 df-int 4951 df-iun 4999 df-iin 5000 df-br 5149 df-opab 5211 df-mpt 5232 df-tr 5266 df-id 5574 df-eprel 5580 df-po 5588 df-so 5589 df-fr 5631 df-we 5633 df-xp 5682 df-rel 5683 df-cnv 5684 df-co 5685 df-dm 5686 df-rn 5687 df-res 5688 df-ima 5689 df-pred 6300 df-ord 6367 df-on 6368 df-lim 6369 df-suc 6370 df-iota 6495 df-fun 6545 df-fn 6546 df-f 6547 df-f1 6548 df-fo 6549 df-f1o 6550 df-fv 6551 df-riota 7367 df-ov 7414 df-oprab 7415 df-mpo 7416 df-om 7858 df-1st 7977 df-2nd 7978 df-frecs 8268 df-wrecs 8299 df-recs 8373 df-rdg 8412 df-1o 8468 df-er 8705 df-ixp 8894 df-en 8942 df-dom 8943 df-sdom 8944 df-fin 8945 df-pnf 11254 df-mnf 11255 df-xr 11256 df-ltxr 11257 df-le 11258 df-sub 11450 df-neg 11451 df-nn 12217 df-2 12279 df-sets 17101 df-slot 17119 df-ndx 17131 df-base 17149 df-ress 17178 df-plusg 17214 df-0g 17391 df-mre 17534 df-mrc 17535 df-acs 17537 df-mgm 18565 df-sgrp 18644 df-mnd 18660 df-submnd 18706 df-grp 18858 df-minusg 18859 df-subg 19039 df-dprd 19906

This theorem is referenced by: dprdss 19940 dprdz 19941 dprdf1o 19943 dprdsn 19947 dprd2da 19953 dmdprdsplit2 19957 ablfac1b 19981

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