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Theorem lsmcl 20975

Description: The sum of two subspaces is a subspace. (Contributed by NM, 4-Feb-2014.) (Revised by Mario Carneiro, 19-Apr-2016.)

**Hypotheses**
Ref	Expression
lsmcl.s	⊢ 𝑆 = (LSubSp‘𝑊)
lsmcl.p	⊢ ⊕ = (LSSum‘𝑊)

**Assertion**
Ref	Expression
lsmcl	⊢ ((𝑊 ∈ LMod ∧ 𝑇 ∈ 𝑆 ∧ 𝑈 ∈ 𝑆) → (𝑇 ⊕ 𝑈) ∈ 𝑆)

Proof of Theorem lsmcl Dummy variables 𝑎 𝑑 𝑒 𝑢 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		lmodabl 20799	. . . 4 ⊢ (𝑊 ∈ LMod → 𝑊 ∈ Abel)
2	1	3ad2ant1 1130	. . 3 ⊢ ((𝑊 ∈ LMod ∧ 𝑇 ∈ 𝑆 ∧ 𝑈 ∈ 𝑆) → 𝑊 ∈ Abel)
3		lsmcl.s	. . . . 5 ⊢ 𝑆 = (LSubSp‘𝑊)
4	3	lsssubg 20848	. . . 4 ⊢ ((𝑊 ∈ LMod ∧ 𝑇 ∈ 𝑆) → 𝑇 ∈ (SubGrp‘𝑊))
5	4	3adant3 1129	. . 3 ⊢ ((𝑊 ∈ LMod ∧ 𝑇 ∈ 𝑆 ∧ 𝑈 ∈ 𝑆) → 𝑇 ∈ (SubGrp‘𝑊))
6	3	lsssubg 20848	. . . 4 ⊢ ((𝑊 ∈ LMod ∧ 𝑈 ∈ 𝑆) → 𝑈 ∈ (SubGrp‘𝑊))
7	6	3adant2 1128	. . 3 ⊢ ((𝑊 ∈ LMod ∧ 𝑇 ∈ 𝑆 ∧ 𝑈 ∈ 𝑆) → 𝑈 ∈ (SubGrp‘𝑊))
8		lsmcl.p	. . . 4 ⊢ ⊕ = (LSSum‘𝑊)
9	8	lsmsubg2 19821	. . 3 ⊢ ((𝑊 ∈ Abel ∧ 𝑇 ∈ (SubGrp‘𝑊) ∧ 𝑈 ∈ (SubGrp‘𝑊)) → (𝑇 ⊕ 𝑈) ∈ (SubGrp‘𝑊))
10	2, 5, 7, 9	syl3anc 1368	. 2 ⊢ ((𝑊 ∈ LMod ∧ 𝑇 ∈ 𝑆 ∧ 𝑈 ∈ 𝑆) → (𝑇 ⊕ 𝑈) ∈ (SubGrp‘𝑊))
11		eqid 2728	. . . . . . . 8 ⊢ (+_g‘𝑊) = (+_g‘𝑊)
12	11, 8	lsmelval 19611	. . . . . . 7 ⊢ ((𝑇 ∈ (SubGrp‘𝑊) ∧ 𝑈 ∈ (SubGrp‘𝑊)) → (𝑢 ∈ (𝑇 ⊕ 𝑈) ↔ ∃𝑑 ∈ 𝑇 ∃𝑒 ∈ 𝑈 𝑢 = (𝑑(+_g‘𝑊)𝑒)))
13	5, 7, 12	syl2anc 582	. . . . . 6 ⊢ ((𝑊 ∈ LMod ∧ 𝑇 ∈ 𝑆 ∧ 𝑈 ∈ 𝑆) → (𝑢 ∈ (𝑇 ⊕ 𝑈) ↔ ∃𝑑 ∈ 𝑇 ∃𝑒 ∈ 𝑈 𝑢 = (𝑑(+_g‘𝑊)𝑒)))
14	13	adantr 479	. . . . 5 ⊢ (((𝑊 ∈ LMod ∧ 𝑇 ∈ 𝑆 ∧ 𝑈 ∈ 𝑆) ∧ 𝑎 ∈ (Base‘(Scalar‘𝑊))) → (𝑢 ∈ (𝑇 ⊕ 𝑈) ↔ ∃𝑑 ∈ 𝑇 ∃𝑒 ∈ 𝑈 𝑢 = (𝑑(+_g‘𝑊)𝑒)))
15		simpll1 1209	. . . . . . . . 9 ⊢ ((((𝑊 ∈ LMod ∧ 𝑇 ∈ 𝑆 ∧ 𝑈 ∈ 𝑆) ∧ 𝑎 ∈ (Base‘(Scalar‘𝑊))) ∧ (𝑑 ∈ 𝑇 ∧ 𝑒 ∈ 𝑈)) → 𝑊 ∈ LMod)
16		simplr 767	. . . . . . . . 9 ⊢ ((((𝑊 ∈ LMod ∧ 𝑇 ∈ 𝑆 ∧ 𝑈 ∈ 𝑆) ∧ 𝑎 ∈ (Base‘(Scalar‘𝑊))) ∧ (𝑑 ∈ 𝑇 ∧ 𝑒 ∈ 𝑈)) → 𝑎 ∈ (Base‘(Scalar‘𝑊)))
17		simpll2 1210	. . . . . . . . . 10 ⊢ ((((𝑊 ∈ LMod ∧ 𝑇 ∈ 𝑆 ∧ 𝑈 ∈ 𝑆) ∧ 𝑎 ∈ (Base‘(Scalar‘𝑊))) ∧ (𝑑 ∈ 𝑇 ∧ 𝑒 ∈ 𝑈)) → 𝑇 ∈ 𝑆)
18		simprl 769	. . . . . . . . . 10 ⊢ ((((𝑊 ∈ LMod ∧ 𝑇 ∈ 𝑆 ∧ 𝑈 ∈ 𝑆) ∧ 𝑎 ∈ (Base‘(Scalar‘𝑊))) ∧ (𝑑 ∈ 𝑇 ∧ 𝑒 ∈ 𝑈)) → 𝑑 ∈ 𝑇)
19		eqid 2728	. . . . . . . . . . 11 ⊢ (Base‘𝑊) = (Base‘𝑊)
20	19, 3	lssel 20828	. . . . . . . . . 10 ⊢ ((𝑇 ∈ 𝑆 ∧ 𝑑 ∈ 𝑇) → 𝑑 ∈ (Base‘𝑊))
21	17, 18, 20	syl2anc 582	. . . . . . . . 9 ⊢ ((((𝑊 ∈ LMod ∧ 𝑇 ∈ 𝑆 ∧ 𝑈 ∈ 𝑆) ∧ 𝑎 ∈ (Base‘(Scalar‘𝑊))) ∧ (𝑑 ∈ 𝑇 ∧ 𝑒 ∈ 𝑈)) → 𝑑 ∈ (Base‘𝑊))
22		simpll3 1211	. . . . . . . . . 10 ⊢ ((((𝑊 ∈ LMod ∧ 𝑇 ∈ 𝑆 ∧ 𝑈 ∈ 𝑆) ∧ 𝑎 ∈ (Base‘(Scalar‘𝑊))) ∧ (𝑑 ∈ 𝑇 ∧ 𝑒 ∈ 𝑈)) → 𝑈 ∈ 𝑆)
23		simprr 771	. . . . . . . . . 10 ⊢ ((((𝑊 ∈ LMod ∧ 𝑇 ∈ 𝑆 ∧ 𝑈 ∈ 𝑆) ∧ 𝑎 ∈ (Base‘(Scalar‘𝑊))) ∧ (𝑑 ∈ 𝑇 ∧ 𝑒 ∈ 𝑈)) → 𝑒 ∈ 𝑈)
24	19, 3	lssel 20828	. . . . . . . . . 10 ⊢ ((𝑈 ∈ 𝑆 ∧ 𝑒 ∈ 𝑈) → 𝑒 ∈ (Base‘𝑊))
25	22, 23, 24	syl2anc 582	. . . . . . . . 9 ⊢ ((((𝑊 ∈ LMod ∧ 𝑇 ∈ 𝑆 ∧ 𝑈 ∈ 𝑆) ∧ 𝑎 ∈ (Base‘(Scalar‘𝑊))) ∧ (𝑑 ∈ 𝑇 ∧ 𝑒 ∈ 𝑈)) → 𝑒 ∈ (Base‘𝑊))
26		eqid 2728	. . . . . . . . . 10 ⊢ (Scalar‘𝑊) = (Scalar‘𝑊)
27		eqid 2728	. . . . . . . . . 10 ⊢ ( ·_𝑠 ‘𝑊) = ( ·_𝑠 ‘𝑊)
28		eqid 2728	. . . . . . . . . 10 ⊢ (Base‘(Scalar‘𝑊)) = (Base‘(Scalar‘𝑊))
29	19, 11, 26, 27, 28	lmodvsdi 20775	. . . . . . . . 9 ⊢ ((𝑊 ∈ LMod ∧ (𝑎 ∈ (Base‘(Scalar‘𝑊)) ∧ 𝑑 ∈ (Base‘𝑊) ∧ 𝑒 ∈ (Base‘𝑊))) → (𝑎( ·_𝑠 ‘𝑊)(𝑑(+_g‘𝑊)𝑒)) = ((𝑎( ·_𝑠 ‘𝑊)𝑑)(+_g‘𝑊)(𝑎( ·_𝑠 ‘𝑊)𝑒)))
30	15, 16, 21, 25, 29	syl13anc 1369	. . . . . . . 8 ⊢ ((((𝑊 ∈ LMod ∧ 𝑇 ∈ 𝑆 ∧ 𝑈 ∈ 𝑆) ∧ 𝑎 ∈ (Base‘(Scalar‘𝑊))) ∧ (𝑑 ∈ 𝑇 ∧ 𝑒 ∈ 𝑈)) → (𝑎( ·_𝑠 ‘𝑊)(𝑑(+_g‘𝑊)𝑒)) = ((𝑎( ·_𝑠 ‘𝑊)𝑑)(+_g‘𝑊)(𝑎( ·_𝑠 ‘𝑊)𝑒)))
31	15, 17, 4	syl2anc 582	. . . . . . . . 9 ⊢ ((((𝑊 ∈ LMod ∧ 𝑇 ∈ 𝑆 ∧ 𝑈 ∈ 𝑆) ∧ 𝑎 ∈ (Base‘(Scalar‘𝑊))) ∧ (𝑑 ∈ 𝑇 ∧ 𝑒 ∈ 𝑈)) → 𝑇 ∈ (SubGrp‘𝑊))
32	15, 22, 6	syl2anc 582	. . . . . . . . 9 ⊢ ((((𝑊 ∈ LMod ∧ 𝑇 ∈ 𝑆 ∧ 𝑈 ∈ 𝑆) ∧ 𝑎 ∈ (Base‘(Scalar‘𝑊))) ∧ (𝑑 ∈ 𝑇 ∧ 𝑒 ∈ 𝑈)) → 𝑈 ∈ (SubGrp‘𝑊))
33	26, 27, 28, 3	lssvscl 20846	. . . . . . . . . 10 ⊢ (((𝑊 ∈ LMod ∧ 𝑇 ∈ 𝑆) ∧ (𝑎 ∈ (Base‘(Scalar‘𝑊)) ∧ 𝑑 ∈ 𝑇)) → (𝑎( ·_𝑠 ‘𝑊)𝑑) ∈ 𝑇)
34	15, 17, 16, 18, 33	syl22anc 837	. . . . . . . . 9 ⊢ ((((𝑊 ∈ LMod ∧ 𝑇 ∈ 𝑆 ∧ 𝑈 ∈ 𝑆) ∧ 𝑎 ∈ (Base‘(Scalar‘𝑊))) ∧ (𝑑 ∈ 𝑇 ∧ 𝑒 ∈ 𝑈)) → (𝑎( ·_𝑠 ‘𝑊)𝑑) ∈ 𝑇)
35	26, 27, 28, 3	lssvscl 20846	. . . . . . . . . 10 ⊢ (((𝑊 ∈ LMod ∧ 𝑈 ∈ 𝑆) ∧ (𝑎 ∈ (Base‘(Scalar‘𝑊)) ∧ 𝑒 ∈ 𝑈)) → (𝑎( ·_𝑠 ‘𝑊)𝑒) ∈ 𝑈)
36	15, 22, 16, 23, 35	syl22anc 837	. . . . . . . . 9 ⊢ ((((𝑊 ∈ LMod ∧ 𝑇 ∈ 𝑆 ∧ 𝑈 ∈ 𝑆) ∧ 𝑎 ∈ (Base‘(Scalar‘𝑊))) ∧ (𝑑 ∈ 𝑇 ∧ 𝑒 ∈ 𝑈)) → (𝑎( ·_𝑠 ‘𝑊)𝑒) ∈ 𝑈)
37	11, 8	lsmelvali 19612	. . . . . . . . 9 ⊢ (((𝑇 ∈ (SubGrp‘𝑊) ∧ 𝑈 ∈ (SubGrp‘𝑊)) ∧ ((𝑎( ·_𝑠 ‘𝑊)𝑑) ∈ 𝑇 ∧ (𝑎( ·_𝑠 ‘𝑊)𝑒) ∈ 𝑈)) → ((𝑎( ·_𝑠 ‘𝑊)𝑑)(+_g‘𝑊)(𝑎( ·_𝑠 ‘𝑊)𝑒)) ∈ (𝑇 ⊕ 𝑈))
38	31, 32, 34, 36, 37	syl22anc 837	. . . . . . . 8 ⊢ ((((𝑊 ∈ LMod ∧ 𝑇 ∈ 𝑆 ∧ 𝑈 ∈ 𝑆) ∧ 𝑎 ∈ (Base‘(Scalar‘𝑊))) ∧ (𝑑 ∈ 𝑇 ∧ 𝑒 ∈ 𝑈)) → ((𝑎( ·_𝑠 ‘𝑊)𝑑)(+_g‘𝑊)(𝑎( ·_𝑠 ‘𝑊)𝑒)) ∈ (𝑇 ⊕ 𝑈))
39	30, 38	eqeltrd 2829	. . . . . . 7 ⊢ ((((𝑊 ∈ LMod ∧ 𝑇 ∈ 𝑆 ∧ 𝑈 ∈ 𝑆) ∧ 𝑎 ∈ (Base‘(Scalar‘𝑊))) ∧ (𝑑 ∈ 𝑇 ∧ 𝑒 ∈ 𝑈)) → (𝑎( ·_𝑠 ‘𝑊)(𝑑(+_g‘𝑊)𝑒)) ∈ (𝑇 ⊕ 𝑈))
40		oveq2 7434	. . . . . . . 8 ⊢ (𝑢 = (𝑑(+_g‘𝑊)𝑒) → (𝑎( ·_𝑠 ‘𝑊)𝑢) = (𝑎( ·_𝑠 ‘𝑊)(𝑑(+_g‘𝑊)𝑒)))
41	40	eleq1d 2814	. . . . . . 7 ⊢ (𝑢 = (𝑑(+_g‘𝑊)𝑒) → ((𝑎( ·_𝑠 ‘𝑊)𝑢) ∈ (𝑇 ⊕ 𝑈) ↔ (𝑎( ·_𝑠 ‘𝑊)(𝑑(+_g‘𝑊)𝑒)) ∈ (𝑇 ⊕ 𝑈)))
42	39, 41	syl5ibrcom 246	. . . . . 6 ⊢ ((((𝑊 ∈ LMod ∧ 𝑇 ∈ 𝑆 ∧ 𝑈 ∈ 𝑆) ∧ 𝑎 ∈ (Base‘(Scalar‘𝑊))) ∧ (𝑑 ∈ 𝑇 ∧ 𝑒 ∈ 𝑈)) → (𝑢 = (𝑑(+_g‘𝑊)𝑒) → (𝑎( ·_𝑠 ‘𝑊)𝑢) ∈ (𝑇 ⊕ 𝑈)))
43	42	rexlimdvva 3209	. . . . 5 ⊢ (((𝑊 ∈ LMod ∧ 𝑇 ∈ 𝑆 ∧ 𝑈 ∈ 𝑆) ∧ 𝑎 ∈ (Base‘(Scalar‘𝑊))) → (∃𝑑 ∈ 𝑇 ∃𝑒 ∈ 𝑈 𝑢 = (𝑑(+_g‘𝑊)𝑒) → (𝑎( ·_𝑠 ‘𝑊)𝑢) ∈ (𝑇 ⊕ 𝑈)))
44	14, 43	sylbid 239	. . . 4 ⊢ (((𝑊 ∈ LMod ∧ 𝑇 ∈ 𝑆 ∧ 𝑈 ∈ 𝑆) ∧ 𝑎 ∈ (Base‘(Scalar‘𝑊))) → (𝑢 ∈ (𝑇 ⊕ 𝑈) → (𝑎( ·_𝑠 ‘𝑊)𝑢) ∈ (𝑇 ⊕ 𝑈)))
45	44	impr 453	. . 3 ⊢ (((𝑊 ∈ LMod ∧ 𝑇 ∈ 𝑆 ∧ 𝑈 ∈ 𝑆) ∧ (𝑎 ∈ (Base‘(Scalar‘𝑊)) ∧ 𝑢 ∈ (𝑇 ⊕ 𝑈))) → (𝑎( ·_𝑠 ‘𝑊)𝑢) ∈ (𝑇 ⊕ 𝑈))
46	45	ralrimivva 3198	. 2 ⊢ ((𝑊 ∈ LMod ∧ 𝑇 ∈ 𝑆 ∧ 𝑈 ∈ 𝑆) → ∀𝑎 ∈ (Base‘(Scalar‘𝑊))∀𝑢 ∈ (𝑇 ⊕ 𝑈)(𝑎( ·_𝑠 ‘𝑊)𝑢) ∈ (𝑇 ⊕ 𝑈))
47	26, 28, 19, 27, 3	islss4 20853	. . 3 ⊢ (𝑊 ∈ LMod → ((𝑇 ⊕ 𝑈) ∈ 𝑆 ↔ ((𝑇 ⊕ 𝑈) ∈ (SubGrp‘𝑊) ∧ ∀𝑎 ∈ (Base‘(Scalar‘𝑊))∀𝑢 ∈ (𝑇 ⊕ 𝑈)(𝑎( ·_𝑠 ‘𝑊)𝑢) ∈ (𝑇 ⊕ 𝑈))))
48	47	3ad2ant1 1130	. 2 ⊢ ((𝑊 ∈ LMod ∧ 𝑇 ∈ 𝑆 ∧ 𝑈 ∈ 𝑆) → ((𝑇 ⊕ 𝑈) ∈ 𝑆 ↔ ((𝑇 ⊕ 𝑈) ∈ (SubGrp‘𝑊) ∧ ∀𝑎 ∈ (Base‘(Scalar‘𝑊))∀𝑢 ∈ (𝑇 ⊕ 𝑈)(𝑎( ·_𝑠 ‘𝑊)𝑢) ∈ (𝑇 ⊕ 𝑈))))
49	10, 46, 48	mpbir2and 711	1 ⊢ ((𝑊 ∈ LMod ∧ 𝑇 ∈ 𝑆 ∧ 𝑈 ∈ 𝑆) → (𝑇 ⊕ 𝑈) ∈ 𝑆)

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 205 ∧ wa 394 ∧ w3a 1084 = wceq 1533 ∈ wcel 2098 ∀wral 3058 ∃wrex 3067 ‘cfv 6553 (class class class)co 7426 Basecbs 17187 +_gcplusg 17240 Scalarcsca 17243 ·_𝑠 cvsca 17244 SubGrpcsubg 19082 LSSumclsm 19596 Abelcabl 19743 LModclmod 20750 LSubSpclss 20822

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1789 ax-4 1803 ax-5 1905 ax-6 1963 ax-7 2003 ax-8 2100 ax-9 2108 ax-10 2129 ax-11 2146 ax-12 2166 ax-ext 2699 ax-rep 5289 ax-sep 5303 ax-nul 5310 ax-pow 5369 ax-pr 5433 ax-un 7746 ax-cnex 11202 ax-resscn 11203 ax-1cn 11204 ax-icn 11205 ax-addcl 11206 ax-addrcl 11207 ax-mulcl 11208 ax-mulrcl 11209 ax-mulcom 11210 ax-addass 11211 ax-mulass 11212 ax-distr 11213 ax-i2m1 11214 ax-1ne0 11215 ax-1rid 11216 ax-rnegex 11217 ax-rrecex 11218 ax-cnre 11219 ax-pre-lttri 11220 ax-pre-lttrn 11221 ax-pre-ltadd 11222 ax-pre-mulgt0 11223

This theorem depends on definitions: df-bi 206 df-an 395 df-or 846 df-3or 1085 df-3an 1086 df-tru 1536 df-fal 1546 df-ex 1774 df-nf 1778 df-sb 2060 df-mo 2529 df-eu 2558 df-clab 2706 df-cleq 2720 df-clel 2806 df-nfc 2881 df-ne 2938 df-nel 3044 df-ral 3059 df-rex 3068 df-rmo 3374 df-reu 3375 df-rab 3431 df-v 3475 df-sbc 3779 df-csb 3895 df-dif 3952 df-un 3954 df-in 3956 df-ss 3966 df-pss 3968 df-nul 4327 df-if 4533 df-pw 4608 df-sn 4633 df-pr 4635 df-op 4639 df-uni 4913 df-iun 5002 df-br 5153 df-opab 5215 df-mpt 5236 df-tr 5270 df-id 5580 df-eprel 5586 df-po 5594 df-so 5595 df-fr 5637 df-we 5639 df-xp 5688 df-rel 5689 df-cnv 5690 df-co 5691 df-dm 5692 df-rn 5693 df-res 5694 df-ima 5695 df-pred 6310 df-ord 6377 df-on 6378 df-lim 6379 df-suc 6380 df-iota 6505 df-fun 6555 df-fn 6556 df-f 6557 df-f1 6558 df-fo 6559 df-f1o 6560 df-fv 6561 df-riota 7382 df-ov 7429 df-oprab 7430 df-mpo 7431 df-om 7877 df-1st 7999 df-2nd 8000 df-frecs 8293 df-wrecs 8324 df-recs 8398 df-rdg 8437 df-er 8731 df-en 8971 df-dom 8972 df-sdom 8973 df-pnf 11288 df-mnf 11289 df-xr 11290 df-ltxr 11291 df-le 11292 df-sub 11484 df-neg 11485 df-nn 12251 df-2 12313 df-sets 17140 df-slot 17158 df-ndx 17170 df-base 17188 df-ress 17217 df-plusg 17253 df-0g 17430 df-mgm 18607 df-sgrp 18686 df-mnd 18702 df-submnd 18748 df-grp 18900 df-minusg 18901 df-sbg 18902 df-subg 19085 df-cntz 19275 df-lsm 19598 df-cmn 19744 df-abl 19745 df-mgp 20082 df-ur 20129 df-ring 20182 df-lmod 20752 df-lss 20823

This theorem is referenced by: lsmelval2 20977 lsmsp 20978 lspprabs 20987 pj1lmhm 20992 lspabs3 21016 pjth 25387 lshpnelb 38488 lsmsat 38512 lsmcv2 38533 lcvat 38534 lcvexchlem4 38541 lcvexchlem5 38542 lcv1 38545 lsatexch 38547 lsatcv0eq 38551 lsatcvatlem 38553 lsatcvat2 38555 lsatcvat3 38556 lkrlsp 38606 dia2dimlem7 40575 dihjustlem 40721 dihord1 40723 dihlsscpre 40739 dihjatcclem2 40924 dihjat1lem 40933 dochexmidlem5 40969 dochexmidlem6 40970 dochexmidlem8 40972 lcfrlem23 41070 mapdlsmcl 41168 mapdlsm 41169 mapdpglem1 41177 mapdpglem2a 41179 mapdindp0 41224 mapdheq4lem 41236 mapdh6lem1N 41238 mapdh6lem2N 41239 hdmap1l6lem1 41312 hdmap1l6lem2 41313 hdmaprnlem3eN 41363 kercvrlsm 42538

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