Theorem xmetres2 24247

Description: Restriction of an extended metric. (Contributed by Mario Carneiro, 20-Aug-2015.)

Assertion

Ref	Expression
xmetres2	⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑅 ⊆ 𝑋) → (𝐷 ↾ (𝑅 × 𝑅)) ∈ (∞Met‘𝑅))

Proof of Theorem xmetres2

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

Step	Hyp	Ref	Expression
1		elfvdm 6857	. . . 4 ⊢ (𝐷 ∈ (∞Met‘𝑋) → 𝑋 ∈ dom ∞Met)
2	1	adantr 480	. . 3 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑅 ⊆ 𝑋) → 𝑋 ∈ dom ∞Met)
3		simpr 484	. . 3 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑅 ⊆ 𝑋) → 𝑅 ⊆ 𝑋)
4	2, 3	ssexd 5263	. 2 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑅 ⊆ 𝑋) → 𝑅 ∈ V)
5		xmetf 24215	. . . 4 ⊢ (𝐷 ∈ (∞Met‘𝑋) → 𝐷:(𝑋 × 𝑋)⟶ℝ*)
6	5	adantr 480	. . 3 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑅 ⊆ 𝑋) → 𝐷:(𝑋 × 𝑋)⟶ℝ*)
7		xpss12 5634	. . . 4 ⊢ ((𝑅 ⊆ 𝑋 ∧ 𝑅 ⊆ 𝑋) → (𝑅 × 𝑅) ⊆ (𝑋 × 𝑋))
8	3, 7	sylancom 588	. . 3 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑅 ⊆ 𝑋) → (𝑅 × 𝑅) ⊆ (𝑋 × 𝑋))
9	6, 8	fssresd 6691	. 2 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑅 ⊆ 𝑋) → (𝐷 ↾ (𝑅 × 𝑅)):(𝑅 × 𝑅)⟶ℝ*)
10		ovres 7515	. . . . 5 ⊢ ((𝑥 ∈ 𝑅 ∧ 𝑦 ∈ 𝑅) → (𝑥(𝐷 ↾ (𝑅 × 𝑅))𝑦) = (𝑥𝐷𝑦))
11	10	adantl 481	. . . 4 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑅 ⊆ 𝑋) ∧ (𝑥 ∈ 𝑅 ∧ 𝑦 ∈ 𝑅)) → (𝑥(𝐷 ↾ (𝑅 × 𝑅))𝑦) = (𝑥𝐷𝑦))
12	11	eqeq1d 2731	. . 3 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑅 ⊆ 𝑋) ∧ (𝑥 ∈ 𝑅 ∧ 𝑦 ∈ 𝑅)) → ((𝑥(𝐷 ↾ (𝑅 × 𝑅))𝑦) = 0 ↔ (𝑥𝐷𝑦) = 0))
13		simpll 766	. . . 4 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑅 ⊆ 𝑋) ∧ (𝑥 ∈ 𝑅 ∧ 𝑦 ∈ 𝑅)) → 𝐷 ∈ (∞Met‘𝑋))
14		simplr 768	. . . . 5 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑅 ⊆ 𝑋) ∧ (𝑥 ∈ 𝑅 ∧ 𝑦 ∈ 𝑅)) → 𝑅 ⊆ 𝑋)
15		simprl 770	. . . . 5 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑅 ⊆ 𝑋) ∧ (𝑥 ∈ 𝑅 ∧ 𝑦 ∈ 𝑅)) → 𝑥 ∈ 𝑅)
16	14, 15	sseldd 3936	. . . 4 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑅 ⊆ 𝑋) ∧ (𝑥 ∈ 𝑅 ∧ 𝑦 ∈ 𝑅)) → 𝑥 ∈ 𝑋)
17		simprr 772	. . . . 5 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑅 ⊆ 𝑋) ∧ (𝑥 ∈ 𝑅 ∧ 𝑦 ∈ 𝑅)) → 𝑦 ∈ 𝑅)
18	14, 17	sseldd 3936	. . . 4 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑅 ⊆ 𝑋) ∧ (𝑥 ∈ 𝑅 ∧ 𝑦 ∈ 𝑅)) → 𝑦 ∈ 𝑋)
19		xmeteq0 24224	. . . 4 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋) → ((𝑥𝐷𝑦) = 0 ↔ 𝑥 = 𝑦))
20	13, 16, 18, 19	syl3anc 1373	. . 3 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑅 ⊆ 𝑋) ∧ (𝑥 ∈ 𝑅 ∧ 𝑦 ∈ 𝑅)) → ((𝑥𝐷𝑦) = 0 ↔ 𝑥 = 𝑦))
21	12, 20	bitrd 279	. 2 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑅 ⊆ 𝑋) ∧ (𝑥 ∈ 𝑅 ∧ 𝑦 ∈ 𝑅)) → ((𝑥(𝐷 ↾ (𝑅 × 𝑅))𝑦) = 0 ↔ 𝑥 = 𝑦))
22		simpll 766	. . . 4 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑅 ⊆ 𝑋) ∧ (𝑥 ∈ 𝑅 ∧ 𝑦 ∈ 𝑅 ∧ 𝑧 ∈ 𝑅)) → 𝐷 ∈ (∞Met‘𝑋))
23		simplr 768	. . . . 5 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑅 ⊆ 𝑋) ∧ (𝑥 ∈ 𝑅 ∧ 𝑦 ∈ 𝑅 ∧ 𝑧 ∈ 𝑅)) → 𝑅 ⊆ 𝑋)
24		simpr3 1197	. . . . 5 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑅 ⊆ 𝑋) ∧ (𝑥 ∈ 𝑅 ∧ 𝑦 ∈ 𝑅 ∧ 𝑧 ∈ 𝑅)) → 𝑧 ∈ 𝑅)
25	23, 24	sseldd 3936	. . . 4 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑅 ⊆ 𝑋) ∧ (𝑥 ∈ 𝑅 ∧ 𝑦 ∈ 𝑅 ∧ 𝑧 ∈ 𝑅)) → 𝑧 ∈ 𝑋)
26	16	3adantr3 1172	. . . 4 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑅 ⊆ 𝑋) ∧ (𝑥 ∈ 𝑅 ∧ 𝑦 ∈ 𝑅 ∧ 𝑧 ∈ 𝑅)) → 𝑥 ∈ 𝑋)
27	18	3adantr3 1172	. . . 4 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑅 ⊆ 𝑋) ∧ (𝑥 ∈ 𝑅 ∧ 𝑦 ∈ 𝑅 ∧ 𝑧 ∈ 𝑅)) → 𝑦 ∈ 𝑋)
28		xmettri2 24226	. . . 4 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ (𝑧 ∈ 𝑋 ∧ 𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → (𝑥𝐷𝑦) ≤ ((𝑧𝐷𝑥) +𝑒 (𝑧𝐷𝑦)))
29	22, 25, 26, 27, 28	syl13anc 1374	. . 3 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑅 ⊆ 𝑋) ∧ (𝑥 ∈ 𝑅 ∧ 𝑦 ∈ 𝑅 ∧ 𝑧 ∈ 𝑅)) → (𝑥𝐷𝑦) ≤ ((𝑧𝐷𝑥) +𝑒 (𝑧𝐷𝑦)))
30	11	3adantr3 1172	. . 3 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑅 ⊆ 𝑋) ∧ (𝑥 ∈ 𝑅 ∧ 𝑦 ∈ 𝑅 ∧ 𝑧 ∈ 𝑅)) → (𝑥(𝐷 ↾ (𝑅 × 𝑅))𝑦) = (𝑥𝐷𝑦))
31		simpr1 1195	. . . . 5 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑅 ⊆ 𝑋) ∧ (𝑥 ∈ 𝑅 ∧ 𝑦 ∈ 𝑅 ∧ 𝑧 ∈ 𝑅)) → 𝑥 ∈ 𝑅)
32	24, 31	ovresd 7516	. . . 4 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑅 ⊆ 𝑋) ∧ (𝑥 ∈ 𝑅 ∧ 𝑦 ∈ 𝑅 ∧ 𝑧 ∈ 𝑅)) → (𝑧(𝐷 ↾ (𝑅 × 𝑅))𝑥) = (𝑧𝐷𝑥))
33		simpr2 1196	. . . . 5 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑅 ⊆ 𝑋) ∧ (𝑥 ∈ 𝑅 ∧ 𝑦 ∈ 𝑅 ∧ 𝑧 ∈ 𝑅)) → 𝑦 ∈ 𝑅)
34	24, 33	ovresd 7516	. . . 4 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑅 ⊆ 𝑋) ∧ (𝑥 ∈ 𝑅 ∧ 𝑦 ∈ 𝑅 ∧ 𝑧 ∈ 𝑅)) → (𝑧(𝐷 ↾ (𝑅 × 𝑅))𝑦) = (𝑧𝐷𝑦))
35	32, 34	oveq12d 7367	. . 3 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑅 ⊆ 𝑋) ∧ (𝑥 ∈ 𝑅 ∧ 𝑦 ∈ 𝑅 ∧ 𝑧 ∈ 𝑅)) → ((𝑧(𝐷 ↾ (𝑅 × 𝑅))𝑥) +𝑒 (𝑧(𝐷 ↾ (𝑅 × 𝑅))𝑦)) = ((𝑧𝐷𝑥) +𝑒 (𝑧𝐷𝑦)))
36	29, 30, 35	3brtr4d 5124	. 2 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑅 ⊆ 𝑋) ∧ (𝑥 ∈ 𝑅 ∧ 𝑦 ∈ 𝑅 ∧ 𝑧 ∈ 𝑅)) → (𝑥(𝐷 ↾ (𝑅 × 𝑅))𝑦) ≤ ((𝑧(𝐷 ↾ (𝑅 × 𝑅))𝑥) +𝑒 (𝑧(𝐷 ↾ (𝑅 × 𝑅))𝑦)))
37	4, 9, 21, 36	isxmetd 24212	1 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑅 ⊆ 𝑋) → (𝐷 ↾ (𝑅 × 𝑅)) ∈ (∞Met‘𝑅))

Syntax hints:   → wi 4   ↔ wb 206   ∧ wa 395   ∧ w3a 1086   = wceq 1540   ∈ wcel 2109  Vcvv 3436   ⊆ wss 3903   class class class wbr 5092   × cxp 5617  dom cdm 5619   ↾ cres 5621  ⟶wf 6478  ‘cfv 6482  (class class class)co 7349  0cc0 11009  ℝ^*cxr 11148   ≤ cle 11150   +_𝑒 cxad 13012  ∞Metcxmet 21246

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 1967  ax-7 2008  ax-8 2111  ax-9 2119  ax-10 2142  ax-11 2158  ax-12 2178  ax-ext 2701  ax-sep 5235  ax-nul 5245  ax-pow 5304  ax-pr 5371  ax-un 7671  ax-cnex 11065  ax-resscn 11066

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1543  df-fal 1553  df-ex 1780  df-nf 1784  df-sb 2066  df-mo 2533  df-eu 2562  df-clab 2708  df-cleq 2721  df-clel 2803  df-nfc 2878  df-ne 2926  df-ral 3045  df-rex 3054  df-rab 3395  df-v 3438  df-sbc 3743  df-dif 3906  df-un 3908  df-in 3910  df-ss 3920  df-nul 4285  df-if 4477  df-pw 4553  df-sn 4578  df-pr 4580  df-op 4584  df-uni 4859  df-br 5093  df-opab 5155  df-mpt 5174  df-id 5514  df-xp 5625  df-rel 5626  df-cnv 5627  df-co 5628  df-dm 5629  df-rn 5630  df-res 5631  df-iota 6438  df-fun 6484  df-fn 6485  df-f 6486  df-fv 6490  df-ov 7352  df-oprab 7353  df-mpo 7354  df-map 8755  df-xr 11153  df-xmet 21254

This theorem is referenced by:  metres2  24249  xmetres  24250  xpsxmet  24266  xpsdsval  24267  xmetresbl  24323  tmsxms  24372  imasf1oxms  24375  metrest  24410  prdsxms  24416  tmsxpsval  24424  nrginvrcn  24578  divcnOLD  24755  divcn  24757  iitopon  24770  cncfmet  24800  cfilres  25194  dvlip2  25898  ftc1lem6  25946  ulmdvlem1  26307  ulmdvlem3  26309  abelth  26349  cxpcn3  26656  rlimcnp  26873  minvecolem4b  30822  minvecolem4  30824  ftc1cnnc  37682  blbnd  37777  ismtyres  37798  reheibor  37829