Theorem nmval2 24911

Description: The value of the norm on a group as the distance restricted to the elements of the base set to zero. (Contributed by Mario Carneiro, 2-Oct-2015.)

Hypotheses

Ref	Expression
nmfval2.n	⊢ 𝑁 = (norm‘𝑊)
nmfval2.x	⊢ 𝑋 = (Base‘𝑊)
nmfval2.z	⊢ 0 = (0g‘𝑊)
nmfval2.d	⊢ 𝐷 = (dist‘𝑊)
nmfval2.e	⊢ 𝐸 = (𝐷 ↾ (𝑋 × 𝑋))

Assertion

Ref	Expression
nmval2	⊢ ((𝑊 ∈ Grp ∧ 𝐴 ∈ 𝑋) → (𝑁‘𝐴) = (𝐴𝐸 0 ))

Proof of Theorem nmval2

Step	Hyp	Ref	Expression
1		nmfval2.n	. . . 4 ⊢ 𝑁 = (norm‘𝑊)
2		nmfval2.x	. . . 4 ⊢ 𝑋 = (Base‘𝑊)
3		nmfval2.z	. . . 4 ⊢ 0 = (0g‘𝑊)
4		nmfval2.d	. . . 4 ⊢ 𝐷 = (dist‘𝑊)
5	1, 2, 3, 4	nmval 24908	. . 3 ⊢ (𝐴 ∈ 𝑋 → (𝑁‘𝐴) = (𝐴𝐷 0 ))
6	5	adantl 487	. 2 ⊢ ((𝑊 ∈ Grp ∧ 𝐴 ∈ 𝑋) → (𝑁‘𝐴) = (𝐴𝐷 0 ))
7		nmfval2.e	. . . 4 ⊢ 𝐸 = (𝐷 ↾ (𝑋 × 𝑋))
8	7	oveqi 7433	. . 3 ⊢ (𝐴𝐸 0 ) = (𝐴(𝐷 ↾ (𝑋 × 𝑋)) 0 )
9		id 23	. . . 4 ⊢ (𝐴 ∈ 𝑋 → 𝐴 ∈ 𝑋)
10	2, 3	grpidcl 19176	. . . 4 ⊢ (𝑊 ∈ Grp → 0 ∈ 𝑋)
11		ovres 7586	. . . 4 ⊢ ((𝐴 ∈ 𝑋 ∧ 0 ∈ 𝑋) → (𝐴(𝐷 ↾ (𝑋 × 𝑋)) 0 ) = (𝐴𝐷 0 ))
12	9, 10, 11	syl2anr 609	. . 3 ⊢ ((𝑊 ∈ Grp ∧ 𝐴 ∈ 𝑋) → (𝐴(𝐷 ↾ (𝑋 × 𝑋)) 0 ) = (𝐴𝐷 0 ))
13	8, 12	eqtr2id 2809	. 2 ⊢ ((𝑊 ∈ Grp ∧ 𝐴 ∈ 𝑋) → (𝐴𝐷 0 ) = (𝐴𝐸 0 ))
14	6, 13	eqtrd 2796	1 ⊢ ((𝑊 ∈ Grp ∧ 𝐴 ∈ 𝑋) → (𝑁‘𝐴) = (𝐴𝐸 0 ))

This proof depends on syntax axioms:   → wi 4   ∧ wa 401   = wceq 1570   ∈ wcel 2145   × cxp 5649   ↾ cres 5653  ‘cfv 6538  (class class class)co 7420  Basecbs 17387  distcds 17437  0_gc0g 17610  Grpcgrp 19144  normcnm 24895

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2147  ax-9 2155  ax-10 2178  ax-11 2194  ax-12 2213  ax-ext 2733  ax-sep 5249  ax-nul 5260  ax-pow 5327  ax-pr 5391  ax-un 7751

This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-nf 1817  df-sb 2100  df-mo 2565  df-eu 2595  df-clab 2740  df-cleq 2753  df-clel 2836  df-nfc 2910  df-ne 2957  df-ral 3078  df-rex 3088  df-rmo 3366  df-reu 3367  df-rab 3414  df-v 3453  df-sbc 3740  df-dif 3902  df-un 3904  df-in 3906  df-ss 3916  df-nul 4280  df-if 4483  df-pw 4559  df-sn 4585  df-pr 4587  df-op 4591  df-uni 4868  df-br 5104  df-opab 5168  df-mpt 5187  df-id 5546  df-xp 5657  df-rel 5658  df-cnv 5659  df-co 5660  df-dm 5661  df-rn 5662  df-res 5663  df-ima 5664  df-iota 6494  df-fun 6540  df-fn 6541  df-f 6542  df-fv 6546  df-riota 7377  df-ov 7423  df-0g 17612  df-mgm 18816  df-sgrp 18908  df-mnd 18924  df-grp 19147  df-nm 24901

This theorem is used by:  nmhmcn  25441  nglmle  25623