Theorem tngngp2 24016

Description: A norm turns a group into a normed group iff the generated metric is in fact a metric. (Contributed by Mario Carneiro, 4-Oct-2015.)

Hypotheses

Ref	Expression
tngngp2.t	⊢ 𝑇 = (𝐺 toNrmGrp 𝑁)
tngngp2.x	⊢ 𝑋 = (Base‘𝐺)
tngngp2.d	⊢ 𝐷 = (dist‘𝑇)

Assertion

Ref	Expression
tngngp2	⊢ (𝑁:𝑋⟶ℝ → (𝑇 ∈ NrmGrp ↔ (𝐺 ∈ Grp ∧ 𝐷 ∈ (Met‘𝑋))))

Proof of Theorem tngngp2

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

Step	Hyp	Ref	Expression
1		ngpgrp 23955	. . . . 5 ⊢ (𝑇 ∈ NrmGrp → 𝑇 ∈ Grp)
2		tngngp2.x	. . . . . . . 8 ⊢ 𝑋 = (Base‘𝐺)
3	2	fvexi 6856	. . . . . . 7 ⊢ 𝑋 ∈ V
4		reex 11142	. . . . . . 7 ⊢ ℝ ∈ V
5		fex2 7870	. . . . . . 7 ⊢ ((𝑁:𝑋⟶ℝ ∧ 𝑋 ∈ V ∧ ℝ ∈ V) → 𝑁 ∈ V)
6	3, 4, 5	mp3an23 1453	. . . . . 6 ⊢ (𝑁:𝑋⟶ℝ → 𝑁 ∈ V)
7	2	a1i 11	. . . . . . 7 ⊢ (𝑁 ∈ V → 𝑋 = (Base‘𝐺))
8		tngngp2.t	. . . . . . . 8 ⊢ 𝑇 = (𝐺 toNrmGrp 𝑁)
9	8, 2	tngbas 23998	. . . . . . 7 ⊢ (𝑁 ∈ V → 𝑋 = (Base‘𝑇))
10		eqid 2736	. . . . . . . . 9 ⊢ (+g‘𝐺) = (+g‘𝐺)
11	8, 10	tngplusg 24000	. . . . . . . 8 ⊢ (𝑁 ∈ V → (+g‘𝐺) = (+g‘𝑇))
12	11	oveqdr 7385	. . . . . . 7 ⊢ ((𝑁 ∈ V ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → (𝑥(+g‘𝐺)𝑦) = (𝑥(+g‘𝑇)𝑦))
13	7, 9, 12	grppropd 18765	. . . . . 6 ⊢ (𝑁 ∈ V → (𝐺 ∈ Grp ↔ 𝑇 ∈ Grp))
14	6, 13	syl 17	. . . . 5 ⊢ (𝑁:𝑋⟶ℝ → (𝐺 ∈ Grp ↔ 𝑇 ∈ Grp))
15	1, 14	syl5ibr 245	. . . 4 ⊢ (𝑁:𝑋⟶ℝ → (𝑇 ∈ NrmGrp → 𝐺 ∈ Grp))
16	15	imp 407	. . 3 ⊢ ((𝑁:𝑋⟶ℝ ∧ 𝑇 ∈ NrmGrp) → 𝐺 ∈ Grp)
17		ngpms 23956	. . . . . 6 ⊢ (𝑇 ∈ NrmGrp → 𝑇 ∈ MetSp)
18	17	adantl 482	. . . . 5 ⊢ ((𝑁:𝑋⟶ℝ ∧ 𝑇 ∈ NrmGrp) → 𝑇 ∈ MetSp)
19		eqid 2736	. . . . . 6 ⊢ (Base‘𝑇) = (Base‘𝑇)
20		tngngp2.d	. . . . . 6 ⊢ 𝐷 = (dist‘𝑇)
21	19, 20	msmet2 23813	. . . . 5 ⊢ (𝑇 ∈ MetSp → (𝐷 ↾ ((Base‘𝑇) × (Base‘𝑇))) ∈ (Met‘(Base‘𝑇)))
22	18, 21	syl 17	. . . 4 ⊢ ((𝑁:𝑋⟶ℝ ∧ 𝑇 ∈ NrmGrp) → (𝐷 ↾ ((Base‘𝑇) × (Base‘𝑇))) ∈ (Met‘(Base‘𝑇)))
23		eqid 2736	. . . . . . . . . 10 ⊢ (-g‘𝐺) = (-g‘𝐺)
24	2, 23	grpsubf 18826	. . . . . . . . 9 ⊢ (𝐺 ∈ Grp → (-g‘𝐺):(𝑋 × 𝑋)⟶𝑋)
25	16, 24	syl 17	. . . . . . . 8 ⊢ ((𝑁:𝑋⟶ℝ ∧ 𝑇 ∈ NrmGrp) → (-g‘𝐺):(𝑋 × 𝑋)⟶𝑋)
26		fco 6692	. . . . . . . 8 ⊢ ((𝑁:𝑋⟶ℝ ∧ (-g‘𝐺):(𝑋 × 𝑋)⟶𝑋) → (𝑁 ∘ (-g‘𝐺)):(𝑋 × 𝑋)⟶ℝ)
27	25, 26	syldan 591	. . . . . . 7 ⊢ ((𝑁:𝑋⟶ℝ ∧ 𝑇 ∈ NrmGrp) → (𝑁 ∘ (-g‘𝐺)):(𝑋 × 𝑋)⟶ℝ)
28	6	adantr 481	. . . . . . . . . 10 ⊢ ((𝑁:𝑋⟶ℝ ∧ 𝑇 ∈ NrmGrp) → 𝑁 ∈ V)
29	8, 23	tngds 24011	. . . . . . . . . 10 ⊢ (𝑁 ∈ V → (𝑁 ∘ (-g‘𝐺)) = (dist‘𝑇))
30	28, 29	syl 17	. . . . . . . . 9 ⊢ ((𝑁:𝑋⟶ℝ ∧ 𝑇 ∈ NrmGrp) → (𝑁 ∘ (-g‘𝐺)) = (dist‘𝑇))
31	20, 30	eqtr4id 2795	. . . . . . . 8 ⊢ ((𝑁:𝑋⟶ℝ ∧ 𝑇 ∈ NrmGrp) → 𝐷 = (𝑁 ∘ (-g‘𝐺)))
32	31	feq1d 6653	. . . . . . 7 ⊢ ((𝑁:𝑋⟶ℝ ∧ 𝑇 ∈ NrmGrp) → (𝐷:(𝑋 × 𝑋)⟶ℝ ↔ (𝑁 ∘ (-g‘𝐺)):(𝑋 × 𝑋)⟶ℝ))
33	27, 32	mpbird 256	. . . . . 6 ⊢ ((𝑁:𝑋⟶ℝ ∧ 𝑇 ∈ NrmGrp) → 𝐷:(𝑋 × 𝑋)⟶ℝ)
34		ffn 6668	. . . . . 6 ⊢ (𝐷:(𝑋 × 𝑋)⟶ℝ → 𝐷 Fn (𝑋 × 𝑋))
35		fnresdm 6620	. . . . . 6 ⊢ (𝐷 Fn (𝑋 × 𝑋) → (𝐷 ↾ (𝑋 × 𝑋)) = 𝐷)
36	33, 34, 35	3syl 18	. . . . 5 ⊢ ((𝑁:𝑋⟶ℝ ∧ 𝑇 ∈ NrmGrp) → (𝐷 ↾ (𝑋 × 𝑋)) = 𝐷)
37	28, 9	syl 17	. . . . . . 7 ⊢ ((𝑁:𝑋⟶ℝ ∧ 𝑇 ∈ NrmGrp) → 𝑋 = (Base‘𝑇))
38	37	sqxpeqd 5665	. . . . . 6 ⊢ ((𝑁:𝑋⟶ℝ ∧ 𝑇 ∈ NrmGrp) → (𝑋 × 𝑋) = ((Base‘𝑇) × (Base‘𝑇)))
39	38	reseq2d 5937	. . . . 5 ⊢ ((𝑁:𝑋⟶ℝ ∧ 𝑇 ∈ NrmGrp) → (𝐷 ↾ (𝑋 × 𝑋)) = (𝐷 ↾ ((Base‘𝑇) × (Base‘𝑇))))
40	36, 39	eqtr3d 2778	. . . 4 ⊢ ((𝑁:𝑋⟶ℝ ∧ 𝑇 ∈ NrmGrp) → 𝐷 = (𝐷 ↾ ((Base‘𝑇) × (Base‘𝑇))))
41	37	fveq2d 6846	. . . 4 ⊢ ((𝑁:𝑋⟶ℝ ∧ 𝑇 ∈ NrmGrp) → (Met‘𝑋) = (Met‘(Base‘𝑇)))
42	22, 40, 41	3eltr4d 2853	. . 3 ⊢ ((𝑁:𝑋⟶ℝ ∧ 𝑇 ∈ NrmGrp) → 𝐷 ∈ (Met‘𝑋))
43	16, 42	jca 512	. 2 ⊢ ((𝑁:𝑋⟶ℝ ∧ 𝑇 ∈ NrmGrp) → (𝐺 ∈ Grp ∧ 𝐷 ∈ (Met‘𝑋)))
44	14	biimpa 477	. . . 4 ⊢ ((𝑁:𝑋⟶ℝ ∧ 𝐺 ∈ Grp) → 𝑇 ∈ Grp)
45	44	adantrr 715	. . 3 ⊢ ((𝑁:𝑋⟶ℝ ∧ (𝐺 ∈ Grp ∧ 𝐷 ∈ (Met‘𝑋))) → 𝑇 ∈ Grp)
46		simprr 771	. . . . . . . 8 ⊢ ((𝑁:𝑋⟶ℝ ∧ (𝐺 ∈ Grp ∧ 𝐷 ∈ (Met‘𝑋))) → 𝐷 ∈ (Met‘𝑋))
47	6	adantr 481	. . . . . . . . . 10 ⊢ ((𝑁:𝑋⟶ℝ ∧ (𝐺 ∈ Grp ∧ 𝐷 ∈ (Met‘𝑋))) → 𝑁 ∈ V)
48	47, 9	syl 17	. . . . . . . . 9 ⊢ ((𝑁:𝑋⟶ℝ ∧ (𝐺 ∈ Grp ∧ 𝐷 ∈ (Met‘𝑋))) → 𝑋 = (Base‘𝑇))
49	48	fveq2d 6846	. . . . . . . 8 ⊢ ((𝑁:𝑋⟶ℝ ∧ (𝐺 ∈ Grp ∧ 𝐷 ∈ (Met‘𝑋))) → (Met‘𝑋) = (Met‘(Base‘𝑇)))
50	46, 49	eleqtrd 2840	. . . . . . 7 ⊢ ((𝑁:𝑋⟶ℝ ∧ (𝐺 ∈ Grp ∧ 𝐷 ∈ (Met‘𝑋))) → 𝐷 ∈ (Met‘(Base‘𝑇)))
51		metf 23683	. . . . . . 7 ⊢ (𝐷 ∈ (Met‘(Base‘𝑇)) → 𝐷:((Base‘𝑇) × (Base‘𝑇))⟶ℝ)
52	50, 51	syl 17	. . . . . 6 ⊢ ((𝑁:𝑋⟶ℝ ∧ (𝐺 ∈ Grp ∧ 𝐷 ∈ (Met‘𝑋))) → 𝐷:((Base‘𝑇) × (Base‘𝑇))⟶ℝ)
53		ffn 6668	. . . . . 6 ⊢ (𝐷:((Base‘𝑇) × (Base‘𝑇))⟶ℝ → 𝐷 Fn ((Base‘𝑇) × (Base‘𝑇)))
54		fnresdm 6620	. . . . . 6 ⊢ (𝐷 Fn ((Base‘𝑇) × (Base‘𝑇)) → (𝐷 ↾ ((Base‘𝑇) × (Base‘𝑇))) = 𝐷)
55	52, 53, 54	3syl 18	. . . . 5 ⊢ ((𝑁:𝑋⟶ℝ ∧ (𝐺 ∈ Grp ∧ 𝐷 ∈ (Met‘𝑋))) → (𝐷 ↾ ((Base‘𝑇) × (Base‘𝑇))) = 𝐷)
56	55, 50	eqeltrd 2838	. . . 4 ⊢ ((𝑁:𝑋⟶ℝ ∧ (𝐺 ∈ Grp ∧ 𝐷 ∈ (Met‘𝑋))) → (𝐷 ↾ ((Base‘𝑇) × (Base‘𝑇))) ∈ (Met‘(Base‘𝑇)))
57	55	fveq2d 6846	. . . . 5 ⊢ ((𝑁:𝑋⟶ℝ ∧ (𝐺 ∈ Grp ∧ 𝐷 ∈ (Met‘𝑋))) → (MetOpen‘(𝐷 ↾ ((Base‘𝑇) × (Base‘𝑇)))) = (MetOpen‘𝐷))
58		simprl 769	. . . . . 6 ⊢ ((𝑁:𝑋⟶ℝ ∧ (𝐺 ∈ Grp ∧ 𝐷 ∈ (Met‘𝑋))) → 𝐺 ∈ Grp)
59		eqid 2736	. . . . . . 7 ⊢ (MetOpen‘𝐷) = (MetOpen‘𝐷)
60	8, 20, 59	tngtopn 24014	. . . . . 6 ⊢ ((𝐺 ∈ Grp ∧ 𝑁 ∈ V) → (MetOpen‘𝐷) = (TopOpen‘𝑇))
61	58, 47, 60	syl2anc 584	. . . . 5 ⊢ ((𝑁:𝑋⟶ℝ ∧ (𝐺 ∈ Grp ∧ 𝐷 ∈ (Met‘𝑋))) → (MetOpen‘𝐷) = (TopOpen‘𝑇))
62	57, 61	eqtr2d 2777	. . . 4 ⊢ ((𝑁:𝑋⟶ℝ ∧ (𝐺 ∈ Grp ∧ 𝐷 ∈ (Met‘𝑋))) → (TopOpen‘𝑇) = (MetOpen‘(𝐷 ↾ ((Base‘𝑇) × (Base‘𝑇)))))
63		eqid 2736	. . . . 5 ⊢ (TopOpen‘𝑇) = (TopOpen‘𝑇)
64	20	reseq1i 5933	. . . . 5 ⊢ (𝐷 ↾ ((Base‘𝑇) × (Base‘𝑇))) = ((dist‘𝑇) ↾ ((Base‘𝑇) × (Base‘𝑇)))
65	63, 19, 64	isms2 23803	. . . 4 ⊢ (𝑇 ∈ MetSp ↔ ((𝐷 ↾ ((Base‘𝑇) × (Base‘𝑇))) ∈ (Met‘(Base‘𝑇)) ∧ (TopOpen‘𝑇) = (MetOpen‘(𝐷 ↾ ((Base‘𝑇) × (Base‘𝑇))))))
66	56, 62, 65	sylanbrc 583	. . 3 ⊢ ((𝑁:𝑋⟶ℝ ∧ (𝐺 ∈ Grp ∧ 𝐷 ∈ (Met‘𝑋))) → 𝑇 ∈ MetSp)
67		simpl 483	. . . . . . 7 ⊢ ((𝑁:𝑋⟶ℝ ∧ (𝐺 ∈ Grp ∧ 𝐷 ∈ (Met‘𝑋))) → 𝑁:𝑋⟶ℝ)
68	8, 2, 4	tngnm 24015	. . . . . . 7 ⊢ ((𝐺 ∈ Grp ∧ 𝑁:𝑋⟶ℝ) → 𝑁 = (norm‘𝑇))
69	58, 67, 68	syl2anc 584	. . . . . 6 ⊢ ((𝑁:𝑋⟶ℝ ∧ (𝐺 ∈ Grp ∧ 𝐷 ∈ (Met‘𝑋))) → 𝑁 = (norm‘𝑇))
70	7, 9	eqtr3d 2778	. . . . . . . 8 ⊢ (𝑁 ∈ V → (Base‘𝐺) = (Base‘𝑇))
71	70, 11	grpsubpropd 18852	. . . . . . 7 ⊢ (𝑁 ∈ V → (-g‘𝐺) = (-g‘𝑇))
72	47, 71	syl 17	. . . . . 6 ⊢ ((𝑁:𝑋⟶ℝ ∧ (𝐺 ∈ Grp ∧ 𝐷 ∈ (Met‘𝑋))) → (-g‘𝐺) = (-g‘𝑇))
73	69, 72	coeq12d 5820	. . . . 5 ⊢ ((𝑁:𝑋⟶ℝ ∧ (𝐺 ∈ Grp ∧ 𝐷 ∈ (Met‘𝑋))) → (𝑁 ∘ (-g‘𝐺)) = ((norm‘𝑇) ∘ (-g‘𝑇)))
74	47, 29	syl 17	. . . . 5 ⊢ ((𝑁:𝑋⟶ℝ ∧ (𝐺 ∈ Grp ∧ 𝐷 ∈ (Met‘𝑋))) → (𝑁 ∘ (-g‘𝐺)) = (dist‘𝑇))
75	73, 74	eqtr3d 2778	. . . 4 ⊢ ((𝑁:𝑋⟶ℝ ∧ (𝐺 ∈ Grp ∧ 𝐷 ∈ (Met‘𝑋))) → ((norm‘𝑇) ∘ (-g‘𝑇)) = (dist‘𝑇))
76		eqimss 4000	. . . 4 ⊢ (((norm‘𝑇) ∘ (-g‘𝑇)) = (dist‘𝑇) → ((norm‘𝑇) ∘ (-g‘𝑇)) ⊆ (dist‘𝑇))
77	75, 76	syl 17	. . 3 ⊢ ((𝑁:𝑋⟶ℝ ∧ (𝐺 ∈ Grp ∧ 𝐷 ∈ (Met‘𝑋))) → ((norm‘𝑇) ∘ (-g‘𝑇)) ⊆ (dist‘𝑇))
78		eqid 2736	. . . 4 ⊢ (norm‘𝑇) = (norm‘𝑇)
79		eqid 2736	. . . 4 ⊢ (-g‘𝑇) = (-g‘𝑇)
80		eqid 2736	. . . 4 ⊢ (dist‘𝑇) = (dist‘𝑇)
81	78, 79, 80	isngp 23952	. . 3 ⊢ (𝑇 ∈ NrmGrp ↔ (𝑇 ∈ Grp ∧ 𝑇 ∈ MetSp ∧ ((norm‘𝑇) ∘ (-g‘𝑇)) ⊆ (dist‘𝑇)))
82	45, 66, 77, 81	syl3anbrc 1343	. 2 ⊢ ((𝑁:𝑋⟶ℝ ∧ (𝐺 ∈ Grp ∧ 𝐷 ∈ (Met‘𝑋))) → 𝑇 ∈ NrmGrp)
83	43, 82	impbida 799	1 ⊢ (𝑁:𝑋⟶ℝ → (𝑇 ∈ NrmGrp ↔ (𝐺 ∈ Grp ∧ 𝐷 ∈ (Met‘𝑋))))

Syntax hints:   → wi 4   ↔ wb 205   ∧ wa 396   = wceq 1541   ∈ wcel 2106  Vcvv 3445   ⊆ wss 3910   × cxp 5631   ↾ cres 5635   ∘ ccom 5637   Fn wfn 6491  ⟶wf 6492  ‘cfv 6496  (class class class)co 7357  ℝcr 11050  Basecbs 17083  +_gcplusg 17133  distcds 17142  TopOpenctopn 17303  Grpcgrp 18748  -_gcsg 18750  Metcmet 20782  MetOpencmopn 20786  MetSpcms 23671  normcnm 23932  NrmGrpcngp 23933   toNrmGrp ctng 23934

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 2707  ax-rep 5242  ax-sep 5256  ax-nul 5263  ax-pow 5320  ax-pr 5384  ax-un 7672  ax-cnex 11107  ax-resscn 11108  ax-1cn 11109  ax-icn 11110  ax-addcl 11111  ax-addrcl 11112  ax-mulcl 11113  ax-mulrcl 11114  ax-mulcom 11115  ax-addass 11116  ax-mulass 11117  ax-distr 11118  ax-i2m1 11119  ax-1ne0 11120  ax-1rid 11121  ax-rnegex 11122  ax-rrecex 11123  ax-cnre 11124  ax-pre-lttri 11125  ax-pre-lttrn 11126  ax-pre-ltadd 11127  ax-pre-mulgt0 11128  ax-pre-sup 11129

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 2538  df-eu 2567  df-clab 2714  df-cleq 2728  df-clel 2814  df-nfc 2889  df-ne 2944  df-nel 3050  df-ral 3065  df-rex 3074  df-rmo 3353  df-reu 3354  df-rab 3408  df-v 3447  df-sbc 3740  df-csb 3856  df-dif 3913  df-un 3915  df-in 3917  df-ss 3927  df-pss 3929  df-nul 4283  df-if 4487  df-pw 4562  df-sn 4587  df-pr 4589  df-op 4593  df-uni 4866  df-iun 4956  df-br 5106  df-opab 5168  df-mpt 5189  df-tr 5223  df-id 5531  df-eprel 5537  df-po 5545  df-so 5546  df-fr 5588  df-we 5590  df-xp 5639  df-rel 5640  df-cnv 5641  df-co 5642  df-dm 5643  df-rn 5644  df-res 5645  df-ima 5646  df-pred 6253  df-ord 6320  df-on 6321  df-lim 6322  df-suc 6323  df-iota 6448  df-fun 6498  df-fn 6499  df-f 6500  df-f1 6501  df-fo 6502  df-f1o 6503  df-fv 6504  df-riota 7313  df-ov 7360  df-oprab 7361  df-mpo 7362  df-om 7803  df-1st 7921  df-2nd 7922  df-frecs 8212  df-wrecs 8243  df-recs 8317  df-rdg 8356  df-er 8648  df-map 8767  df-en 8884  df-dom 8885  df-sdom 8886  df-sup 9378  df-inf 9379  df-pnf 11191  df-mnf 11192  df-xr 11193  df-ltxr 11194  df-le 11195  df-sub 11387  df-neg 11388  df-div 11813  df-nn 12154  df-2 12216  df-3 12217  df-4 12218  df-5 12219  df-6 12220  df-7 12221  df-8 12222  df-9 12223  df-n0 12414  df-z 12500  df-dec 12619  df-uz 12764  df-q 12874  df-rp 12916  df-xneg 13033  df-xadd 13034  df-xmul 13035  df-sets 17036  df-slot 17054  df-ndx 17066  df-base 17084  df-plusg 17146  df-tset 17152  df-ds 17155  df-rest 17304  df-topn 17305  df-0g 17323  df-topgen 17325  df-mgm 18497  df-sgrp 18546  df-mnd 18557  df-grp 18751  df-minusg 18752  df-sbg 18753  df-psmet 20788  df-xmet 20789  df-met 20790  df-bl 20791  df-mopn 20792  df-top 22243  df-topon 22260  df-topsp 22282  df-bases 22296  df-xms 23673  df-ms 23674  df-nm 23938  df-ngp 23939  df-tng 23940

This theorem is referenced by:  tngngpd  24017  tngngp  24018  nrmtngnrm  24022  tngngpim  24023  tngnrg  24038