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Theorem lsmdisj 19666

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 19642	. . . . . 6 ⊢ ((𝑆 ∈ (SubGrp‘𝐺) ∧ 𝑇 ∈ (SubGrp‘𝐺)) → 𝑆 ⊆ (𝑆 ⊕ 𝑇))
5	1, 2, 4	syl2anc 584	. . . . 5 ⊢ (𝜑 → 𝑆 ⊆ (𝑆 ⊕ 𝑇))
6	5	ssrind 4224	. . . 4 ⊢ (𝜑 → (𝑆 ∩ 𝑈) ⊆ ((𝑆 ⊕ 𝑇) ∩ 𝑈))
7		lsmdisj.i	. . . 4 ⊢ (𝜑 → ((𝑆 ⊕ 𝑇) ∩ 𝑈) = { 0 })
8	6, 7	sseqtrd 4000	. . 3 ⊢ (𝜑 → (𝑆 ∩ 𝑈) ⊆ { 0 })
9		lsmdisj.o	. . . . . . 7 ⊢ 0 = (0_g‘𝐺)
10	9	subg0cl 19120	. . . . . 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 19120	. . . . . 6 ⊢ (𝑈 ∈ (SubGrp‘𝐺) → 0 ∈ 𝑈)
14	12, 13	syl 17	. . . . 5 ⊢ (𝜑 → 0 ∈ 𝑈)
15	11, 14	elind 4180	. . . 4 ⊢ (𝜑 → 0 ∈ (𝑆 ∩ 𝑈))
16	15	snssd 4789	. . 3 ⊢ (𝜑 → { 0 } ⊆ (𝑆 ∩ 𝑈))
17	8, 16	eqssd 3981	. 2 ⊢ (𝜑 → (𝑆 ∩ 𝑈) = { 0 })
18	3	lsmub2 19643	. . . . . 6 ⊢ ((𝑆 ∈ (SubGrp‘𝐺) ∧ 𝑇 ∈ (SubGrp‘𝐺)) → 𝑇 ⊆ (𝑆 ⊕ 𝑇))
19	1, 2, 18	syl2anc 584	. . . . 5 ⊢ (𝜑 → 𝑇 ⊆ (𝑆 ⊕ 𝑇))
20	19	ssrind 4224	. . . 4 ⊢ (𝜑 → (𝑇 ∩ 𝑈) ⊆ ((𝑆 ⊕ 𝑇) ∩ 𝑈))
21	20, 7	sseqtrd 4000	. . 3 ⊢ (𝜑 → (𝑇 ∩ 𝑈) ⊆ { 0 })
22	9	subg0cl 19120	. . . . . 6 ⊢ (𝑇 ∈ (SubGrp‘𝐺) → 0 ∈ 𝑇)
23	2, 22	syl 17	. . . . 5 ⊢ (𝜑 → 0 ∈ 𝑇)
24	23, 14	elind 4180	. . . 4 ⊢ (𝜑 → 0 ∈ (𝑇 ∩ 𝑈))
25	24	snssd 4789	. . 3 ⊢ (𝜑 → { 0 } ⊆ (𝑇 ∩ 𝑈))
26	21, 25	eqssd 3981	. 2 ⊢ (𝜑 → (𝑇 ∩ 𝑈) = { 0 })
27	17, 26	jca 511	1 ⊢ (𝜑 → ((𝑆 ∩ 𝑈) = { 0 } ∧ (𝑇 ∩ 𝑈) = { 0 }))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ wa 395 = wceq 1539 ∈ wcel 2107 ∩ cin 3930 ⊆ wss 3931 {csn 4606 ‘cfv 6540 (class class class)co 7412 0_gc0g 17454 SubGrpcsubg 19106 LSSumclsm 19619

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1794 ax-4 1808 ax-5 1909 ax-6 1966 ax-7 2006 ax-8 2109 ax-9 2117 ax-10 2140 ax-11 2156 ax-12 2176 ax-ext 2706 ax-rep 5259 ax-sep 5276 ax-nul 5286 ax-pow 5345 ax-pr 5412 ax-un 7736 ax-cnex 11192 ax-resscn 11193 ax-1cn 11194 ax-icn 11195 ax-addcl 11196 ax-addrcl 11197 ax-mulcl 11198 ax-mulrcl 11199 ax-mulcom 11200 ax-addass 11201 ax-mulass 11202 ax-distr 11203 ax-i2m1 11204 ax-1ne0 11205 ax-1rid 11206 ax-rnegex 11207 ax-rrecex 11208 ax-cnre 11209 ax-pre-lttri 11210 ax-pre-lttrn 11211 ax-pre-ltadd 11212 ax-pre-mulgt0 11213

This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1542 df-fal 1552 df-ex 1779 df-nf 1783 df-sb 2064 df-mo 2538 df-eu 2567 df-clab 2713 df-cleq 2726 df-clel 2808 df-nfc 2884 df-ne 2932 df-nel 3036 df-ral 3051 df-rex 3060 df-rmo 3363 df-reu 3364 df-rab 3420 df-v 3465 df-sbc 3771 df-csb 3880 df-dif 3934 df-un 3936 df-in 3938 df-ss 3948 df-pss 3951 df-nul 4314 df-if 4506 df-pw 4582 df-sn 4607 df-pr 4609 df-op 4613 df-uni 4888 df-iun 4973 df-br 5124 df-opab 5186 df-mpt 5206 df-tr 5240 df-id 5558 df-eprel 5564 df-po 5572 df-so 5573 df-fr 5617 df-we 5619 df-xp 5671 df-rel 5672 df-cnv 5673 df-co 5674 df-dm 5675 df-rn 5676 df-res 5677 df-ima 5678 df-pred 6301 df-ord 6366 df-on 6367 df-lim 6368 df-suc 6369 df-iota 6493 df-fun 6542 df-fn 6543 df-f 6544 df-f1 6545 df-fo 6546 df-f1o 6547 df-fv 6548 df-riota 7369 df-ov 7415 df-oprab 7416 df-mpo 7417 df-om 7869 df-1st 7995 df-2nd 7996 df-frecs 8287 df-wrecs 8318 df-recs 8392 df-rdg 8431 df-er 8726 df-en 8967 df-dom 8968 df-sdom 8969 df-pnf 11278 df-mnf 11279 df-xr 11280 df-ltxr 11281 df-le 11282 df-sub 11475 df-neg 11476 df-nn 12248 df-2 12310 df-sets 17182 df-slot 17200 df-ndx 17212 df-base 17229 df-ress 17252 df-plusg 17285 df-0g 17456 df-mgm 18621 df-sgrp 18700 df-mnd 18716 df-submnd 18765 df-grp 18922 df-minusg 18923 df-subg 19109 df-lsm 19621

This theorem is referenced by: lsmdisjr 19669 lsmdisj2a 19672 lsmdisj2b 19673

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