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Theorem lspabs2 21118

Description: Absorption law for span of vector sum. (Contributed by NM, 30-Apr-2015.)

**Hypotheses**
Ref	Expression
lspabs2.v	⊢ 𝑉 = (Base‘𝑊)
lspabs2.p	⊢ + = (+_g‘𝑊)
lspabs2.o	⊢ 0 = (0_g‘𝑊)
lspabs2.n	⊢ 𝑁 = (LSpan‘𝑊)
lspabs2.w	⊢ (𝜑 → 𝑊 ∈ LVec)
lspabs2.x	⊢ (𝜑 → 𝑋 ∈ 𝑉)
lspabs2.y	⊢ (𝜑 → 𝑌 ∈ (𝑉 ∖ { 0 }))
lspabs2.e	⊢ (𝜑 → (𝑁‘{𝑋}) = (𝑁‘{(𝑋 + 𝑌)}))

**Assertion**
Ref	Expression
lspabs2	⊢ (𝜑 → (𝑁‘{𝑋}) = (𝑁‘{𝑌}))

**Proof of Theorem lspabs2**
Step	Hyp	Ref	Expression
1		lspabs2.w	. . . . . . 7 ⊢ (𝜑 → 𝑊 ∈ LVec)
2		lveclmod 21101	. . . . . . 7 ⊢ (𝑊 ∈ LVec → 𝑊 ∈ LMod)
3	1, 2	syl 17	. . . . . 6 ⊢ (𝜑 → 𝑊 ∈ LMod)
4		lspabs2.x	. . . . . 6 ⊢ (𝜑 → 𝑋 ∈ 𝑉)
5		lspabs2.v	. . . . . . 7 ⊢ 𝑉 = (Base‘𝑊)
6		lspabs2.n	. . . . . . 7 ⊢ 𝑁 = (LSpan‘𝑊)
7	5, 6	lspsnsubg 20975	. . . . . 6 ⊢ ((𝑊 ∈ LMod ∧ 𝑋 ∈ 𝑉) → (𝑁‘{𝑋}) ∈ (SubGrp‘𝑊))
8	3, 4, 7	syl2anc 585	. . . . 5 ⊢ (𝜑 → (𝑁‘{𝑋}) ∈ (SubGrp‘𝑊))
9		lspabs2.y	. . . . . . 7 ⊢ (𝜑 → 𝑌 ∈ (𝑉 ∖ { 0 }))
10	9	eldifad 3901	. . . . . 6 ⊢ (𝜑 → 𝑌 ∈ 𝑉)
11	5, 6	lspsnsubg 20975	. . . . . 6 ⊢ ((𝑊 ∈ LMod ∧ 𝑌 ∈ 𝑉) → (𝑁‘{𝑌}) ∈ (SubGrp‘𝑊))
12	3, 10, 11	syl2anc 585	. . . . 5 ⊢ (𝜑 → (𝑁‘{𝑌}) ∈ (SubGrp‘𝑊))
13		eqid 2736	. . . . . 6 ⊢ (LSSum‘𝑊) = (LSSum‘𝑊)
14	13	lsmub2 19633	. . . . 5 ⊢ (((𝑁‘{𝑋}) ∈ (SubGrp‘𝑊) ∧ (𝑁‘{𝑌}) ∈ (SubGrp‘𝑊)) → (𝑁‘{𝑌}) ⊆ ((𝑁‘{𝑋})(LSSum‘𝑊)(𝑁‘{𝑌})))
15	8, 12, 14	syl2anc 585	. . . 4 ⊢ (𝜑 → (𝑁‘{𝑌}) ⊆ ((𝑁‘{𝑋})(LSSum‘𝑊)(𝑁‘{𝑌})))
16		lspabs2.e	. . . . . 6 ⊢ (𝜑 → (𝑁‘{𝑋}) = (𝑁‘{(𝑋 + 𝑌)}))
17	16	oveq2d 7383	. . . . 5 ⊢ (𝜑 → ((𝑁‘{𝑋})(LSSum‘𝑊)(𝑁‘{𝑋})) = ((𝑁‘{𝑋})(LSSum‘𝑊)(𝑁‘{(𝑋 + 𝑌)})))
18	13	lsmidm 19638	. . . . . 6 ⊢ ((𝑁‘{𝑋}) ∈ (SubGrp‘𝑊) → ((𝑁‘{𝑋})(LSSum‘𝑊)(𝑁‘{𝑋})) = (𝑁‘{𝑋}))
19	8, 18	syl 17	. . . . 5 ⊢ (𝜑 → ((𝑁‘{𝑋})(LSSum‘𝑊)(𝑁‘{𝑋})) = (𝑁‘{𝑋}))
20		lspabs2.p	. . . . . . 7 ⊢ + = (+_g‘𝑊)
21	5, 20, 6, 3, 4, 10	lspprabs 21090	. . . . . 6 ⊢ (𝜑 → (𝑁‘{𝑋, (𝑋 + 𝑌)}) = (𝑁‘{𝑋, 𝑌}))
22	5, 20	lmodvacl 20870	. . . . . . . 8 ⊢ ((𝑊 ∈ LMod ∧ 𝑋 ∈ 𝑉 ∧ 𝑌 ∈ 𝑉) → (𝑋 + 𝑌) ∈ 𝑉)
23	3, 4, 10, 22	syl3anc 1374	. . . . . . 7 ⊢ (𝜑 → (𝑋 + 𝑌) ∈ 𝑉)
24	5, 6, 13, 3, 4, 23	lsmpr 21084	. . . . . 6 ⊢ (𝜑 → (𝑁‘{𝑋, (𝑋 + 𝑌)}) = ((𝑁‘{𝑋})(LSSum‘𝑊)(𝑁‘{(𝑋 + 𝑌)})))
25	5, 6, 13, 3, 4, 10	lsmpr 21084	. . . . . 6 ⊢ (𝜑 → (𝑁‘{𝑋, 𝑌}) = ((𝑁‘{𝑋})(LSSum‘𝑊)(𝑁‘{𝑌})))
26	21, 24, 25	3eqtr3d 2779	. . . . 5 ⊢ (𝜑 → ((𝑁‘{𝑋})(LSSum‘𝑊)(𝑁‘{(𝑋 + 𝑌)})) = ((𝑁‘{𝑋})(LSSum‘𝑊)(𝑁‘{𝑌})))
27	17, 19, 26	3eqtr3rd 2780	. . . 4 ⊢ (𝜑 → ((𝑁‘{𝑋})(LSSum‘𝑊)(𝑁‘{𝑌})) = (𝑁‘{𝑋}))
28	15, 27	sseqtrd 3958	. . 3 ⊢ (𝜑 → (𝑁‘{𝑌}) ⊆ (𝑁‘{𝑋}))
29		lspabs2.o	. . . 4 ⊢ 0 = (0_g‘𝑊)
30	5, 29, 6, 1, 9, 4	lspsncmp 21114	. . 3 ⊢ (𝜑 → ((𝑁‘{𝑌}) ⊆ (𝑁‘{𝑋}) ↔ (𝑁‘{𝑌}) = (𝑁‘{𝑋})))
31	28, 30	mpbid 232	. 2 ⊢ (𝜑 → (𝑁‘{𝑌}) = (𝑁‘{𝑋}))
32	31	eqcomd 2742	1 ⊢ (𝜑 → (𝑁‘{𝑋}) = (𝑁‘{𝑌}))

Colors of variables: wff setvar class

Syntax hints: → wi 4 = wceq 1542 ∈ wcel 2114 ∖ cdif 3886 ⊆ wss 3889 {csn 4567 {cpr 4569 ‘cfv 6498 (class class class)co 7367 Basecbs 17179 +_gcplusg 17220 0_gc0g 17402 SubGrpcsubg 19096 LSSumclsm 19609 LModclmod 20855 LSpanclspn 20966 LVecclvec 21097

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 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2708 ax-rep 5212 ax-sep 5231 ax-nul 5241 ax-pow 5307 ax-pr 5375 ax-un 7689 ax-cnex 11094 ax-resscn 11095 ax-1cn 11096 ax-icn 11097 ax-addcl 11098 ax-addrcl 11099 ax-mulcl 11100 ax-mulrcl 11101 ax-mulcom 11102 ax-addass 11103 ax-mulass 11104 ax-distr 11105 ax-i2m1 11106 ax-1ne0 11107 ax-1rid 11108 ax-rnegex 11109 ax-rrecex 11110 ax-cnre 11111 ax-pre-lttri 11112 ax-pre-lttrn 11113 ax-pre-ltadd 11114 ax-pre-mulgt0 11115

This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2539 df-eu 2569 df-clab 2715 df-cleq 2728 df-clel 2811 df-nfc 2885 df-ne 2933 df-nel 3037 df-ral 3052 df-rex 3062 df-rmo 3342 df-reu 3343 df-rab 3390 df-v 3431 df-sbc 3729 df-csb 3838 df-dif 3892 df-un 3894 df-in 3896 df-ss 3906 df-pss 3909 df-nul 4274 df-if 4467 df-pw 4543 df-sn 4568 df-pr 4570 df-op 4574 df-uni 4851 df-int 4890 df-iun 4935 df-br 5086 df-opab 5148 df-mpt 5167 df-tr 5193 df-id 5526 df-eprel 5531 df-po 5539 df-so 5540 df-fr 5584 df-we 5586 df-xp 5637 df-rel 5638 df-cnv 5639 df-co 5640 df-dm 5641 df-rn 5642 df-res 5643 df-ima 5644 df-pred 6265 df-ord 6326 df-on 6327 df-lim 6328 df-suc 6329 df-iota 6454 df-fun 6500 df-fn 6501 df-f 6502 df-f1 6503 df-fo 6504 df-f1o 6505 df-fv 6506 df-riota 7324 df-ov 7370 df-oprab 7371 df-mpo 7372 df-om 7818 df-1st 7942 df-2nd 7943 df-tpos 8176 df-frecs 8231 df-wrecs 8262 df-recs 8311 df-rdg 8349 df-er 8643 df-en 8894 df-dom 8895 df-sdom 8896 df-pnf 11181 df-mnf 11182 df-xr 11183 df-ltxr 11184 df-le 11185 df-sub 11379 df-neg 11380 df-nn 12175 df-2 12244 df-3 12245 df-sets 17134 df-slot 17152 df-ndx 17164 df-base 17180 df-ress 17201 df-plusg 17233 df-mulr 17234 df-0g 17404 df-mgm 18608 df-sgrp 18687 df-mnd 18703 df-submnd 18752 df-grp 18912 df-minusg 18913 df-sbg 18914 df-subg 19099 df-cntz 19292 df-lsm 19611 df-cmn 19757 df-abl 19758 df-mgp 20122 df-rng 20134 df-ur 20163 df-ring 20216 df-oppr 20317 df-dvdsr 20337 df-unit 20338 df-invr 20368 df-drng 20708 df-lmod 20857 df-lss 20927 df-lsp 20967 df-lvec 21098

This theorem is referenced by: lspindp3 21134

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