Theorem nvf 28070

Description: Mapping for the norm function. (Contributed by NM, 11-Nov-2006.) (New usage is discouraged.)

Hypotheses

Ref	Expression
nvf.1	⊢ 𝑋 = (BaseSet‘𝑈)
nvf.6	⊢ 𝑁 = (normCV‘𝑈)

Assertion

Ref	Expression
nvf	⊢ (𝑈 ∈ NrmCVec → 𝑁:𝑋⟶ℝ)

Proof of Theorem nvf

Dummy variables 𝑥 𝑦 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		nvf.1	. . 3 ⊢ 𝑋 = (BaseSet‘𝑈)
2		eqid 2825	. . 3 ⊢ ( +𝑣 ‘𝑈) = ( +𝑣 ‘𝑈)
3		eqid 2825	. . 3 ⊢ ( ·𝑠OLD ‘𝑈) = ( ·𝑠OLD ‘𝑈)
4		eqid 2825	. . 3 ⊢ (0vec‘𝑈) = (0vec‘𝑈)
5		nvf.6	. . 3 ⊢ 𝑁 = (normCV‘𝑈)
6	1, 2, 3, 4, 5	nvi 28024	. 2 ⊢ (𝑈 ∈ NrmCVec → (⟨( +𝑣 ‘𝑈), ( ·𝑠OLD ‘𝑈)⟩ ∈ CVecOLD ∧ 𝑁:𝑋⟶ℝ ∧ ∀𝑥 ∈ 𝑋 (((𝑁‘𝑥) = 0 → 𝑥 = (0vec‘𝑈)) ∧ ∀𝑦 ∈ ℂ (𝑁‘(𝑦( ·𝑠OLD ‘𝑈)𝑥)) = ((abs‘𝑦) · (𝑁‘𝑥)) ∧ ∀𝑦 ∈ 𝑋 (𝑁‘(𝑥( +𝑣 ‘𝑈)𝑦)) ≤ ((𝑁‘𝑥) + (𝑁‘𝑦)))))
7	6	simp2d 1179	1 ⊢ (𝑈 ∈ NrmCVec → 𝑁:𝑋⟶ℝ)

Syntax hints:   → wi 4   ∧ w3a 1113   = wceq 1658   ∈ wcel 2166  ∀wral 3117  ⟨cop 4403   class class class wbr 4873  ⟶wf 6119  ‘cfv 6123  (class class class)co 6905  ℂcc 10250  ℝcr 10251  0cc0 10252   + caddc 10255   · cmul 10257   ≤ cle 10392  abscabs 14351  CVec_OLDcvc 27968  NrmCVeccnv 27994   +_𝑣 cpv 27995  BaseSetcba 27996   ·_𝑠OLD cns 27997  0_veccn0v 27998  norm_CVcnmcv 28000

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1896  ax-4 1910  ax-5 2011  ax-6 2077  ax-7 2114  ax-8 2168  ax-9 2175  ax-10 2194  ax-11 2209  ax-12 2222  ax-13 2391  ax-ext 2803  ax-rep 4994  ax-sep 5005  ax-nul 5013  ax-pow 5065  ax-pr 5127  ax-un 7209

This theorem depends on definitions:  df-bi 199  df-an 387  df-or 881  df-3an 1115  df-tru 1662  df-ex 1881  df-nf 1885  df-sb 2070  df-mo 2605  df-eu 2640  df-clab 2812  df-cleq 2818  df-clel 2821  df-nfc 2958  df-ne 3000  df-ral 3122  df-rex 3123  df-reu 3124  df-rab 3126  df-v 3416  df-sbc 3663  df-csb 3758  df-dif 3801  df-un 3803  df-in 3805  df-ss 3812  df-nul 4145  df-if 4307  df-sn 4398  df-pr 4400  df-op 4404  df-uni 4659  df-iun 4742  df-br 4874  df-opab 4936  df-mpt 4953  df-id 5250  df-xp 5348  df-rel 5349  df-cnv 5350  df-co 5351  df-dm 5352  df-rn 5353  df-res 5354  df-ima 5355  df-iota 6086  df-fun 6125  df-fn 6126  df-f 6127  df-f1 6128  df-fo 6129  df-f1o 6130  df-fv 6131  df-ov 6908  df-oprab 6909  df-1st 7428  df-2nd 7429  df-vc 27969  df-nv 28002  df-va 28005  df-ba 28006  df-sm 28007  df-0v 28008  df-nmcv 28010

This theorem is referenced by:  nvcl  28071  imsdf  28099  nmcvcn  28105  sspn  28146  hilnormi  28575