ncvs1 - Metamath Proof Explorer

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Theorem ncvs1 24665

Description: From any nonzero vector of a normed subcomplex vector space, construct a collinear vector whose norm is one. (Contributed by NM, 6-Dec-2007.) (Revised by AV, 8-Oct-2021.)

**Hypotheses**
Ref	Expression
ncvs1.x	⊢ 𝑋 = (Base‘𝐺)
ncvs1.n	⊢ 𝑁 = (norm‘𝐺)
ncvs1.z	⊢ 0 = (0_g‘𝐺)
ncvs1.s	⊢ · = ( ·_𝑠 ‘𝐺)
ncvs1.f	⊢ 𝐹 = (Scalar‘𝐺)
ncvs1.k	⊢ 𝐾 = (Base‘𝐹)

**Assertion**
Ref	Expression
ncvs1	⊢ ((𝐺 ∈ (NrmVec ∩ ℂVec) ∧ (𝐴 ∈ 𝑋 ∧ 𝐴 ≠ 0 ) ∧ (1 / (𝑁‘𝐴)) ∈ 𝐾) → (𝑁‘((1 / (𝑁‘𝐴)) · 𝐴)) = 1)

**Proof of Theorem ncvs1**
Step	Hyp	Ref	Expression
1		simp1 1136	. . 3 ⊢ ((𝐺 ∈ (NrmVec ∩ ℂVec) ∧ (𝐴 ∈ 𝑋 ∧ 𝐴 ≠ 0 ) ∧ (1 / (𝑁‘𝐴)) ∈ 𝐾) → 𝐺 ∈ (NrmVec ∩ ℂVec))
2		simp3 1138	. . . 4 ⊢ ((𝐺 ∈ (NrmVec ∩ ℂVec) ∧ (𝐴 ∈ 𝑋 ∧ 𝐴 ≠ 0 ) ∧ (1 / (𝑁‘𝐴)) ∈ 𝐾) → (1 / (𝑁‘𝐴)) ∈ 𝐾)
3		elin 3963	. . . . . . . . 9 ⊢ (𝐺 ∈ (NrmVec ∩ ℂVec) ↔ (𝐺 ∈ NrmVec ∧ 𝐺 ∈ ℂVec))
4		nvcnlm 24204	. . . . . . . . . . 11 ⊢ (𝐺 ∈ NrmVec → 𝐺 ∈ NrmMod)
5		nlmngp 24185	. . . . . . . . . . 11 ⊢ (𝐺 ∈ NrmMod → 𝐺 ∈ NrmGrp)
6	4, 5	syl 17	. . . . . . . . . 10 ⊢ (𝐺 ∈ NrmVec → 𝐺 ∈ NrmGrp)
7	6	adantr 481	. . . . . . . . 9 ⊢ ((𝐺 ∈ NrmVec ∧ 𝐺 ∈ ℂVec) → 𝐺 ∈ NrmGrp)
8	3, 7	sylbi 216	. . . . . . . 8 ⊢ (𝐺 ∈ (NrmVec ∩ ℂVec) → 𝐺 ∈ NrmGrp)
9		simpl 483	. . . . . . . 8 ⊢ ((𝐴 ∈ 𝑋 ∧ 𝐴 ≠ 0 ) → 𝐴 ∈ 𝑋)
10	8, 9	anim12i 613	. . . . . . 7 ⊢ ((𝐺 ∈ (NrmVec ∩ ℂVec) ∧ (𝐴 ∈ 𝑋 ∧ 𝐴 ≠ 0 )) → (𝐺 ∈ NrmGrp ∧ 𝐴 ∈ 𝑋))
11		ncvs1.x	. . . . . . . 8 ⊢ 𝑋 = (Base‘𝐺)
12		ncvs1.n	. . . . . . . 8 ⊢ 𝑁 = (norm‘𝐺)
13	11, 12	nmcl 24116	. . . . . . 7 ⊢ ((𝐺 ∈ NrmGrp ∧ 𝐴 ∈ 𝑋) → (𝑁‘𝐴) ∈ ℝ)
14	10, 13	syl 17	. . . . . 6 ⊢ ((𝐺 ∈ (NrmVec ∩ ℂVec) ∧ (𝐴 ∈ 𝑋 ∧ 𝐴 ≠ 0 )) → (𝑁‘𝐴) ∈ ℝ)
15		ncvs1.z	. . . . . . . . . . . 12 ⊢ 0 = (0_g‘𝐺)
16	11, 12, 15	nmeq0 24118	. . . . . . . . . . 11 ⊢ ((𝐺 ∈ NrmGrp ∧ 𝐴 ∈ 𝑋) → ((𝑁‘𝐴) = 0 ↔ 𝐴 = 0 ))
17	16	bicomd 222	. . . . . . . . . 10 ⊢ ((𝐺 ∈ NrmGrp ∧ 𝐴 ∈ 𝑋) → (𝐴 = 0 ↔ (𝑁‘𝐴) = 0))
18	8, 17	sylan 580	. . . . . . . . 9 ⊢ ((𝐺 ∈ (NrmVec ∩ ℂVec) ∧ 𝐴 ∈ 𝑋) → (𝐴 = 0 ↔ (𝑁‘𝐴) = 0))
19	18	necon3bid 2985	. . . . . . . 8 ⊢ ((𝐺 ∈ (NrmVec ∩ ℂVec) ∧ 𝐴 ∈ 𝑋) → (𝐴 ≠ 0 ↔ (𝑁‘𝐴) ≠ 0))
20	19	biimpd 228	. . . . . . 7 ⊢ ((𝐺 ∈ (NrmVec ∩ ℂVec) ∧ 𝐴 ∈ 𝑋) → (𝐴 ≠ 0 → (𝑁‘𝐴) ≠ 0))
21	20	impr 455	. . . . . 6 ⊢ ((𝐺 ∈ (NrmVec ∩ ℂVec) ∧ (𝐴 ∈ 𝑋 ∧ 𝐴 ≠ 0 )) → (𝑁‘𝐴) ≠ 0)
22	14, 21	rereccld 12037	. . . . 5 ⊢ ((𝐺 ∈ (NrmVec ∩ ℂVec) ∧ (𝐴 ∈ 𝑋 ∧ 𝐴 ≠ 0 )) → (1 / (𝑁‘𝐴)) ∈ ℝ)
23	22	3adant3 1132	. . . 4 ⊢ ((𝐺 ∈ (NrmVec ∩ ℂVec) ∧ (𝐴 ∈ 𝑋 ∧ 𝐴 ≠ 0 ) ∧ (1 / (𝑁‘𝐴)) ∈ 𝐾) → (1 / (𝑁‘𝐴)) ∈ ℝ)
24	2, 23	elind 4193	. . 3 ⊢ ((𝐺 ∈ (NrmVec ∩ ℂVec) ∧ (𝐴 ∈ 𝑋 ∧ 𝐴 ≠ 0 ) ∧ (1 / (𝑁‘𝐴)) ∈ 𝐾) → (1 / (𝑁‘𝐴)) ∈ (𝐾 ∩ ℝ))
25		1re 11210	. . . . . . . 8 ⊢ 1 ∈ ℝ
26		0le1 11733	. . . . . . . 8 ⊢ 0 ≤ 1
27	25, 26	pm3.2i 471	. . . . . . 7 ⊢ (1 ∈ ℝ ∧ 0 ≤ 1)
28	27	a1i 11	. . . . . 6 ⊢ ((𝐺 ∈ (NrmVec ∩ ℂVec) ∧ (𝐴 ∈ 𝑋 ∧ 𝐴 ≠ 0 )) → (1 ∈ ℝ ∧ 0 ≤ 1))
29		simprr 771	. . . . . . 7 ⊢ ((𝐺 ∈ (NrmVec ∩ ℂVec) ∧ (𝐴 ∈ 𝑋 ∧ 𝐴 ≠ 0 )) → 𝐴 ≠ 0 )
30	11, 12, 15	nmgt0 24130	. . . . . . . 8 ⊢ ((𝐺 ∈ NrmGrp ∧ 𝐴 ∈ 𝑋) → (𝐴 ≠ 0 ↔ 0 < (𝑁‘𝐴)))
31	10, 30	syl 17	. . . . . . 7 ⊢ ((𝐺 ∈ (NrmVec ∩ ℂVec) ∧ (𝐴 ∈ 𝑋 ∧ 𝐴 ≠ 0 )) → (𝐴 ≠ 0 ↔ 0 < (𝑁‘𝐴)))
32	29, 31	mpbid 231	. . . . . 6 ⊢ ((𝐺 ∈ (NrmVec ∩ ℂVec) ∧ (𝐴 ∈ 𝑋 ∧ 𝐴 ≠ 0 )) → 0 < (𝑁‘𝐴))
33	28, 14, 32	jca32 516	. . . . 5 ⊢ ((𝐺 ∈ (NrmVec ∩ ℂVec) ∧ (𝐴 ∈ 𝑋 ∧ 𝐴 ≠ 0 )) → ((1 ∈ ℝ ∧ 0 ≤ 1) ∧ ((𝑁‘𝐴) ∈ ℝ ∧ 0 < (𝑁‘𝐴))))
34	33	3adant3 1132	. . . 4 ⊢ ((𝐺 ∈ (NrmVec ∩ ℂVec) ∧ (𝐴 ∈ 𝑋 ∧ 𝐴 ≠ 0 ) ∧ (1 / (𝑁‘𝐴)) ∈ 𝐾) → ((1 ∈ ℝ ∧ 0 ≤ 1) ∧ ((𝑁‘𝐴) ∈ ℝ ∧ 0 < (𝑁‘𝐴))))
35		divge0 12079	. . . 4 ⊢ (((1 ∈ ℝ ∧ 0 ≤ 1) ∧ ((𝑁‘𝐴) ∈ ℝ ∧ 0 < (𝑁‘𝐴))) → 0 ≤ (1 / (𝑁‘𝐴)))
36	34, 35	syl 17	. . 3 ⊢ ((𝐺 ∈ (NrmVec ∩ ℂVec) ∧ (𝐴 ∈ 𝑋 ∧ 𝐴 ≠ 0 ) ∧ (1 / (𝑁‘𝐴)) ∈ 𝐾) → 0 ≤ (1 / (𝑁‘𝐴)))
37		simp2l 1199	. . 3 ⊢ ((𝐺 ∈ (NrmVec ∩ ℂVec) ∧ (𝐴 ∈ 𝑋 ∧ 𝐴 ≠ 0 ) ∧ (1 / (𝑁‘𝐴)) ∈ 𝐾) → 𝐴 ∈ 𝑋)
38		ncvs1.s	. . . 4 ⊢ · = ( ·_𝑠 ‘𝐺)
39		ncvs1.f	. . . 4 ⊢ 𝐹 = (Scalar‘𝐺)
40		ncvs1.k	. . . 4 ⊢ 𝐾 = (Base‘𝐹)
41	11, 12, 38, 39, 40	ncvsge0 24661	. . 3 ⊢ ((𝐺 ∈ (NrmVec ∩ ℂVec) ∧ ((1 / (𝑁‘𝐴)) ∈ (𝐾 ∩ ℝ) ∧ 0 ≤ (1 / (𝑁‘𝐴))) ∧ 𝐴 ∈ 𝑋) → (𝑁‘((1 / (𝑁‘𝐴)) · 𝐴)) = ((1 / (𝑁‘𝐴)) · (𝑁‘𝐴)))
42	1, 24, 36, 37, 41	syl121anc 1375	. 2 ⊢ ((𝐺 ∈ (NrmVec ∩ ℂVec) ∧ (𝐴 ∈ 𝑋 ∧ 𝐴 ≠ 0 ) ∧ (1 / (𝑁‘𝐴)) ∈ 𝐾) → (𝑁‘((1 / (𝑁‘𝐴)) · 𝐴)) = ((1 / (𝑁‘𝐴)) · (𝑁‘𝐴)))
43	10	3adant3 1132	. . . . 5 ⊢ ((𝐺 ∈ (NrmVec ∩ ℂVec) ∧ (𝐴 ∈ 𝑋 ∧ 𝐴 ≠ 0 ) ∧ (1 / (𝑁‘𝐴)) ∈ 𝐾) → (𝐺 ∈ NrmGrp ∧ 𝐴 ∈ 𝑋))
44	43, 13	syl 17	. . . 4 ⊢ ((𝐺 ∈ (NrmVec ∩ ℂVec) ∧ (𝐴 ∈ 𝑋 ∧ 𝐴 ≠ 0 ) ∧ (1 / (𝑁‘𝐴)) ∈ 𝐾) → (𝑁‘𝐴) ∈ ℝ)
45	44	recnd 11238	. . 3 ⊢ ((𝐺 ∈ (NrmVec ∩ ℂVec) ∧ (𝐴 ∈ 𝑋 ∧ 𝐴 ≠ 0 ) ∧ (1 / (𝑁‘𝐴)) ∈ 𝐾) → (𝑁‘𝐴) ∈ ℂ)
46	21	3adant3 1132	. . 3 ⊢ ((𝐺 ∈ (NrmVec ∩ ℂVec) ∧ (𝐴 ∈ 𝑋 ∧ 𝐴 ≠ 0 ) ∧ (1 / (𝑁‘𝐴)) ∈ 𝐾) → (𝑁‘𝐴) ≠ 0)
47	45, 46	recid2d 11982	. 2 ⊢ ((𝐺 ∈ (NrmVec ∩ ℂVec) ∧ (𝐴 ∈ 𝑋 ∧ 𝐴 ≠ 0 ) ∧ (1 / (𝑁‘𝐴)) ∈ 𝐾) → ((1 / (𝑁‘𝐴)) · (𝑁‘𝐴)) = 1)
48	42, 47	eqtrd 2772	1 ⊢ ((𝐺 ∈ (NrmVec ∩ ℂVec) ∧ (𝐴 ∈ 𝑋 ∧ 𝐴 ≠ 0 ) ∧ (1 / (𝑁‘𝐴)) ∈ 𝐾) → (𝑁‘((1 / (𝑁‘𝐴)) · 𝐴)) = 1)

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 205 ∧ wa 396 ∧ w3a 1087 = wceq 1541 ∈ wcel 2106 ≠ wne 2940 ∩ cin 3946 class class class wbr 5147 ‘cfv 6540 (class class class)co 7405 ℝcr 11105 0cc0 11106 1c1 11107 · cmul 11111 < clt 11244 ≤ cle 11245 / cdiv 11867 Basecbs 17140 Scalarcsca 17196 ·_𝑠 cvsca 17197 0_gc0g 17381 normcnm 24076 NrmGrpcngp 24077 NrmModcnlm 24080 NrmVeccnvc 24081 ℂVecccvs 24630

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-sep 5298 ax-nul 5305 ax-pow 5362 ax-pr 5426 ax-un 7721 ax-cnex 11162 ax-resscn 11163 ax-1cn 11164 ax-icn 11165 ax-addcl 11166 ax-addrcl 11167 ax-mulcl 11168 ax-mulrcl 11169 ax-mulcom 11170 ax-addass 11171 ax-mulass 11172 ax-distr 11173 ax-i2m1 11174 ax-1ne0 11175 ax-1rid 11176 ax-rnegex 11177 ax-rrecex 11178 ax-cnre 11179 ax-pre-lttri 11180 ax-pre-lttrn 11181 ax-pre-ltadd 11182 ax-pre-mulgt0 11183 ax-pre-sup 11184 ax-addf 11185 ax-mulf 11186

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 3777 df-csb 3893 df-dif 3950 df-un 3952 df-in 3954 df-ss 3964 df-pss 3966 df-nul 4322 df-if 4528 df-pw 4603 df-sn 4628 df-pr 4630 df-tp 4632 df-op 4634 df-uni 4908 df-iun 4998 df-br 5148 df-opab 5210 df-mpt 5231 df-tr 5265 df-id 5573 df-eprel 5579 df-po 5587 df-so 5588 df-fr 5630 df-we 5632 df-xp 5681 df-rel 5682 df-cnv 5683 df-co 5684 df-dm 5685 df-rn 5686 df-res 5687 df-ima 5688 df-pred 6297 df-ord 6364 df-on 6365 df-lim 6366 df-suc 6367 df-iota 6492 df-fun 6542 df-fn 6543 df-f 6544 df-f1 6545 df-fo 6546 df-f1o 6547 df-fv 6548 df-riota 7361 df-ov 7408 df-oprab 7409 df-mpo 7410 df-om 7852 df-1st 7971 df-2nd 7972 df-frecs 8262 df-wrecs 8293 df-recs 8367 df-rdg 8406 df-1o 8462 df-er 8699 df-map 8818 df-en 8936 df-dom 8937 df-sdom 8938 df-fin 8939 df-sup 9433 df-inf 9434 df-pnf 11246 df-mnf 11247 df-xr 11248 df-ltxr 11249 df-le 11250 df-sub 11442 df-neg 11443 df-div 11868 df-nn 12209 df-2 12271 df-3 12272 df-4 12273 df-5 12274 df-6 12275 df-7 12276 df-8 12277 df-9 12278 df-n0 12469 df-z 12555 df-dec 12674 df-uz 12819 df-q 12929 df-rp 12971 df-xneg 13088 df-xadd 13089 df-xmul 13090 df-fz 13481 df-seq 13963 df-exp 14024 df-cj 15042 df-re 15043 df-im 15044 df-sqrt 15178 df-abs 15179 df-struct 17076 df-sets 17093 df-slot 17111 df-ndx 17123 df-base 17141 df-ress 17170 df-plusg 17206 df-mulr 17207 df-starv 17208 df-tset 17212 df-ple 17213 df-ds 17215 df-unif 17216 df-0g 17383 df-topgen 17385 df-mgm 18557 df-sgrp 18606 df-mnd 18622 df-grp 18818 df-subg 18997 df-cmn 19644 df-mgp 19982 df-ring 20051 df-cring 20052 df-subrg 20353 df-psmet 20928 df-xmet 20929 df-met 20930 df-bl 20931 df-mopn 20932 df-cnfld 20937 df-top 22387 df-topon 22404 df-topsp 22426 df-bases 22440 df-xms 23817 df-ms 23818 df-nm 24082 df-ngp 24083 df-nlm 24086 df-nvc 24087 df-clm 24570 df-cvs 24631

This theorem is referenced by: (None)

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