Theorem nvnd 28463

Description: The norm of a normed complex vector space expressed in terms of the distance function of its induced metric. Problem 1 of [Kreyszig] p. 63. (Contributed by NM, 4-Dec-2006.) (New usage is discouraged.)

Hypotheses

Ref	Expression
nvnd.1	⊢ 𝑋 = (BaseSet‘𝑈)
nvnd.5	⊢ 𝑍 = (0vec‘𝑈)
nvnd.6	⊢ 𝑁 = (normCV‘𝑈)
nvnd.8	⊢ 𝐷 = (IndMet‘𝑈)

Assertion

Ref	Expression
nvnd	⊢ ((𝑈 ∈ NrmCVec ∧ 𝐴 ∈ 𝑋) → (𝑁‘𝐴) = (𝐴𝐷𝑍))

Proof of Theorem nvnd

Step	Hyp	Ref	Expression
1		nvnd.1	. . . . 5 ⊢ 𝑋 = (BaseSet‘𝑈)
2		nvnd.5	. . . . 5 ⊢ 𝑍 = (0vec‘𝑈)
3	1, 2	nvzcl 28409	. . . 4 ⊢ (𝑈 ∈ NrmCVec → 𝑍 ∈ 𝑋)
4	3	adantr 483	. . 3 ⊢ ((𝑈 ∈ NrmCVec ∧ 𝐴 ∈ 𝑋) → 𝑍 ∈ 𝑋)
5		eqid 2820	. . . 4 ⊢ ( −𝑣 ‘𝑈) = ( −𝑣 ‘𝑈)
6		nvnd.6	. . . 4 ⊢ 𝑁 = (normCV‘𝑈)
7		nvnd.8	. . . 4 ⊢ 𝐷 = (IndMet‘𝑈)
8	1, 5, 6, 7	imsdval 28461	. . 3 ⊢ ((𝑈 ∈ NrmCVec ∧ 𝐴 ∈ 𝑋 ∧ 𝑍 ∈ 𝑋) → (𝐴𝐷𝑍) = (𝑁‘(𝐴( −𝑣 ‘𝑈)𝑍)))
9	4, 8	mpd3an3 1457	. 2 ⊢ ((𝑈 ∈ NrmCVec ∧ 𝐴 ∈ 𝑋) → (𝐴𝐷𝑍) = (𝑁‘(𝐴( −𝑣 ‘𝑈)𝑍)))
10		eqid 2820	. . . . . 6 ⊢ ( +𝑣 ‘𝑈) = ( +𝑣 ‘𝑈)
11		eqid 2820	. . . . . 6 ⊢ ( ·𝑠OLD ‘𝑈) = ( ·𝑠OLD ‘𝑈)
12	1, 10, 11, 5	nvmval 28417	. . . . 5 ⊢ ((𝑈 ∈ NrmCVec ∧ 𝐴 ∈ 𝑋 ∧ 𝑍 ∈ 𝑋) → (𝐴( −𝑣 ‘𝑈)𝑍) = (𝐴( +𝑣 ‘𝑈)(-1( ·𝑠OLD ‘𝑈)𝑍)))
13	4, 12	mpd3an3 1457	. . . 4 ⊢ ((𝑈 ∈ NrmCVec ∧ 𝐴 ∈ 𝑋) → (𝐴( −𝑣 ‘𝑈)𝑍) = (𝐴( +𝑣 ‘𝑈)(-1( ·𝑠OLD ‘𝑈)𝑍)))
14		neg1cn 11745	. . . . . . 7 ⊢ -1 ∈ ℂ
15	11, 2	nvsz 28413	. . . . . . 7 ⊢ ((𝑈 ∈ NrmCVec ∧ -1 ∈ ℂ) → (-1( ·𝑠OLD ‘𝑈)𝑍) = 𝑍)
16	14, 15	mpan2 689	. . . . . 6 ⊢ (𝑈 ∈ NrmCVec → (-1( ·𝑠OLD ‘𝑈)𝑍) = 𝑍)
17	16	oveq2d 7165	. . . . 5 ⊢ (𝑈 ∈ NrmCVec → (𝐴( +𝑣 ‘𝑈)(-1( ·𝑠OLD ‘𝑈)𝑍)) = (𝐴( +𝑣 ‘𝑈)𝑍))
18	17	adantr 483	. . . 4 ⊢ ((𝑈 ∈ NrmCVec ∧ 𝐴 ∈ 𝑋) → (𝐴( +𝑣 ‘𝑈)(-1( ·𝑠OLD ‘𝑈)𝑍)) = (𝐴( +𝑣 ‘𝑈)𝑍))
19	1, 10, 2	nv0rid 28410	. . . 4 ⊢ ((𝑈 ∈ NrmCVec ∧ 𝐴 ∈ 𝑋) → (𝐴( +𝑣 ‘𝑈)𝑍) = 𝐴)
20	13, 18, 19	3eqtrd 2859	. . 3 ⊢ ((𝑈 ∈ NrmCVec ∧ 𝐴 ∈ 𝑋) → (𝐴( −𝑣 ‘𝑈)𝑍) = 𝐴)
21	20	fveq2d 6667	. 2 ⊢ ((𝑈 ∈ NrmCVec ∧ 𝐴 ∈ 𝑋) → (𝑁‘(𝐴( −𝑣 ‘𝑈)𝑍)) = (𝑁‘𝐴))
22	9, 21	eqtr2d 2856	1 ⊢ ((𝑈 ∈ NrmCVec ∧ 𝐴 ∈ 𝑋) → (𝑁‘𝐴) = (𝐴𝐷𝑍))

Syntax hints:   → wi 4   ∧ wa 398   = wceq 1536   ∈ wcel 2113  ‘cfv 6348  (class class class)co 7149  ℂcc 10528  1c1 10531  -cneg 10864  NrmCVeccnv 28359   +_𝑣 cpv 28360  BaseSetcba 28361   ·_𝑠OLD cns 28362  0_veccn0v 28363   −_𝑣 cnsb 28364  norm_CVcnmcv 28365  IndMetcims 28366

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1910  ax-6 1969  ax-7 2014  ax-8 2115  ax-9 2123  ax-10 2144  ax-11 2160  ax-12 2176  ax-ext 2792  ax-rep 5183  ax-sep 5196  ax-nul 5203  ax-pow 5259  ax-pr 5323  ax-un 7454  ax-resscn 10587  ax-1cn 10588  ax-icn 10589  ax-addcl 10590  ax-addrcl 10591  ax-mulcl 10592  ax-mulrcl 10593  ax-mulcom 10594  ax-addass 10595  ax-mulass 10596  ax-distr 10597  ax-i2m1 10598  ax-1ne0 10599  ax-1rid 10600  ax-rnegex 10601  ax-rrecex 10602  ax-cnre 10603  ax-pre-lttri 10604  ax-pre-lttrn 10605  ax-pre-ltadd 10606

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3or 1083  df-3an 1084  df-tru 1539  df-ex 1780  df-nf 1784  df-sb 2069  df-mo 2621  df-eu 2653  df-clab 2799  df-cleq 2813  df-clel 2892  df-nfc 2962  df-ne 3016  df-nel 3123  df-ral 3142  df-rex 3143  df-reu 3144  df-rab 3146  df-v 3493  df-sbc 3769  df-csb 3877  df-dif 3932  df-un 3934  df-in 3936  df-ss 3945  df-nul 4285  df-if 4461  df-pw 4534  df-sn 4561  df-pr 4563  df-op 4567  df-uni 4832  df-iun 4914  df-br 5060  df-opab 5122  df-mpt 5140  df-id 5453  df-po 5467  df-so 5468  df-xp 5554  df-rel 5555  df-cnv 5556  df-co 5557  df-dm 5558  df-rn 5559  df-res 5560  df-ima 5561  df-iota 6307  df-fun 6350  df-fn 6351  df-f 6352  df-f1 6353  df-fo 6354  df-f1o 6355  df-fv 6356  df-riota 7107  df-ov 7152  df-oprab 7153  df-mpo 7154  df-1st 7682  df-2nd 7683  df-er 8282  df-en 8503  df-dom 8504  df-sdom 8505  df-pnf 10670  df-mnf 10671  df-ltxr 10673  df-sub 10865  df-neg 10866  df-grpo 28268  df-gid 28269  df-ginv 28270  df-gdiv 28271  df-ablo 28320  df-vc 28334  df-nv 28367  df-va 28370  df-ba 28371  df-sm 28372  df-0v 28373  df-vs 28374  df-nmcv 28375  df-ims 28376

This theorem is referenced by:  ubthlem1  28645