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Theorem lsmdisj 19590

Description: Disjointness from a subgroup sum. (Contributed by Mario Carneiro, 21-Apr-2016.)

**Hypotheses**
Ref	Expression
lsmcntz.p	⊢ ⊕ = (LSSum‘𝐺)
lsmcntz.s	⊢ (𝜑 → 𝑆 ∈ (SubGrp‘𝐺))
lsmcntz.t	⊢ (𝜑 → 𝑇 ∈ (SubGrp‘𝐺))
lsmcntz.u	⊢ (𝜑 → 𝑈 ∈ (SubGrp‘𝐺))
lsmdisj.o	⊢ 0 = (0_g‘𝐺)
lsmdisj.i	⊢ (𝜑 → ((𝑆 ⊕ 𝑇) ∩ 𝑈) = { 0 })

**Assertion**
Ref	Expression
lsmdisj	⊢ (𝜑 → ((𝑆 ∩ 𝑈) = { 0 } ∧ (𝑇 ∩ 𝑈) = { 0 }))

**Proof of Theorem lsmdisj**
Step	Hyp	Ref	Expression
1		lsmcntz.s	. . . . . 6 ⊢ (𝜑 → 𝑆 ∈ (SubGrp‘𝐺))
2		lsmcntz.t	. . . . . 6 ⊢ (𝜑 → 𝑇 ∈ (SubGrp‘𝐺))
3		lsmcntz.p	. . . . . . 7 ⊢ ⊕ = (LSSum‘𝐺)
4	3	lsmub1 19566	. . . . . 6 ⊢ ((𝑆 ∈ (SubGrp‘𝐺) ∧ 𝑇 ∈ (SubGrp‘𝐺)) → 𝑆 ⊆ (𝑆 ⊕ 𝑇))
5	1, 2, 4	syl2anc 584	. . . . 5 ⊢ (𝜑 → 𝑆 ⊆ (𝑆 ⊕ 𝑇))
6	5	ssrind 4235	. . . 4 ⊢ (𝜑 → (𝑆 ∩ 𝑈) ⊆ ((𝑆 ⊕ 𝑇) ∩ 𝑈))
7		lsmdisj.i	. . . 4 ⊢ (𝜑 → ((𝑆 ⊕ 𝑇) ∩ 𝑈) = { 0 })
8	6, 7	sseqtrd 4022	. . 3 ⊢ (𝜑 → (𝑆 ∩ 𝑈) ⊆ { 0 })
9		lsmdisj.o	. . . . . . 7 ⊢ 0 = (0_g‘𝐺)
10	9	subg0cl 19050	. . . . . 6 ⊢ (𝑆 ∈ (SubGrp‘𝐺) → 0 ∈ 𝑆)
11	1, 10	syl 17	. . . . 5 ⊢ (𝜑 → 0 ∈ 𝑆)
12		lsmcntz.u	. . . . . 6 ⊢ (𝜑 → 𝑈 ∈ (SubGrp‘𝐺))
13	9	subg0cl 19050	. . . . . 6 ⊢ (𝑈 ∈ (SubGrp‘𝐺) → 0 ∈ 𝑈)
14	12, 13	syl 17	. . . . 5 ⊢ (𝜑 → 0 ∈ 𝑈)
15	11, 14	elind 4194	. . . 4 ⊢ (𝜑 → 0 ∈ (𝑆 ∩ 𝑈))
16	15	snssd 4812	. . 3 ⊢ (𝜑 → { 0 } ⊆ (𝑆 ∩ 𝑈))
17	8, 16	eqssd 3999	. 2 ⊢ (𝜑 → (𝑆 ∩ 𝑈) = { 0 })
18	3	lsmub2 19567	. . . . . 6 ⊢ ((𝑆 ∈ (SubGrp‘𝐺) ∧ 𝑇 ∈ (SubGrp‘𝐺)) → 𝑇 ⊆ (𝑆 ⊕ 𝑇))
19	1, 2, 18	syl2anc 584	. . . . 5 ⊢ (𝜑 → 𝑇 ⊆ (𝑆 ⊕ 𝑇))
20	19	ssrind 4235	. . . 4 ⊢ (𝜑 → (𝑇 ∩ 𝑈) ⊆ ((𝑆 ⊕ 𝑇) ∩ 𝑈))
21	20, 7	sseqtrd 4022	. . 3 ⊢ (𝜑 → (𝑇 ∩ 𝑈) ⊆ { 0 })
22	9	subg0cl 19050	. . . . . 6 ⊢ (𝑇 ∈ (SubGrp‘𝐺) → 0 ∈ 𝑇)
23	2, 22	syl 17	. . . . 5 ⊢ (𝜑 → 0 ∈ 𝑇)
24	23, 14	elind 4194	. . . 4 ⊢ (𝜑 → 0 ∈ (𝑇 ∩ 𝑈))
25	24	snssd 4812	. . 3 ⊢ (𝜑 → { 0 } ⊆ (𝑇 ∩ 𝑈))
26	21, 25	eqssd 3999	. 2 ⊢ (𝜑 → (𝑇 ∩ 𝑈) = { 0 })
27	17, 26	jca 512	1 ⊢ (𝜑 → ((𝑆 ∩ 𝑈) = { 0 } ∧ (𝑇 ∩ 𝑈) = { 0 }))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ wa 396 = wceq 1541 ∈ wcel 2106 ∩ cin 3947 ⊆ wss 3948 {csn 4628 ‘cfv 6543 (class class class)co 7411 0_gc0g 17389 SubGrpcsubg 19036 LSSumclsm 19543

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-iun 4999 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-er 8705 df-en 8942 df-dom 8943 df-sdom 8944 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-mgm 18565 df-sgrp 18644 df-mnd 18660 df-submnd 18706 df-grp 18858 df-minusg 18859 df-subg 19039 df-lsm 19545

This theorem is referenced by: lsmdisjr 19593 lsmdisj2a 19596 lsmdisj2b 19597

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