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Theorem xmetres2 22071
Description: Restriction of an extended metric. (Contributed by Mario Carneiro, 20-Aug-2015.)
Assertion
Ref Expression
xmetres2 ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑅𝑋) → (𝐷 ↾ (𝑅 × 𝑅)) ∈ (∞Met‘𝑅))

Proof of Theorem xmetres2
Dummy variables 𝑥 𝑦 𝑧 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 elfvdm 6178 . . . 4 (𝐷 ∈ (∞Met‘𝑋) → 𝑋 ∈ dom ∞Met)
21adantr 481 . . 3 ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑅𝑋) → 𝑋 ∈ dom ∞Met)
3 simpr 477 . . 3 ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑅𝑋) → 𝑅𝑋)
42, 3ssexd 4770 . 2 ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑅𝑋) → 𝑅 ∈ V)
5 xmetf 22039 . . . 4 (𝐷 ∈ (∞Met‘𝑋) → 𝐷:(𝑋 × 𝑋)⟶ℝ*)
65adantr 481 . . 3 ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑅𝑋) → 𝐷:(𝑋 × 𝑋)⟶ℝ*)
7 xpss12 5191 . . . 4 ((𝑅𝑋𝑅𝑋) → (𝑅 × 𝑅) ⊆ (𝑋 × 𝑋))
83, 7sylancom 700 . . 3 ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑅𝑋) → (𝑅 × 𝑅) ⊆ (𝑋 × 𝑋))
96, 8fssresd 6030 . 2 ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑅𝑋) → (𝐷 ↾ (𝑅 × 𝑅)):(𝑅 × 𝑅)⟶ℝ*)
10 ovres 6754 . . . . 5 ((𝑥𝑅𝑦𝑅) → (𝑥(𝐷 ↾ (𝑅 × 𝑅))𝑦) = (𝑥𝐷𝑦))
1110adantl 482 . . . 4 (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑅𝑋) ∧ (𝑥𝑅𝑦𝑅)) → (𝑥(𝐷 ↾ (𝑅 × 𝑅))𝑦) = (𝑥𝐷𝑦))
1211eqeq1d 2628 . . 3 (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑅𝑋) ∧ (𝑥𝑅𝑦𝑅)) → ((𝑥(𝐷 ↾ (𝑅 × 𝑅))𝑦) = 0 ↔ (𝑥𝐷𝑦) = 0))
13 simpll 789 . . . 4 (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑅𝑋) ∧ (𝑥𝑅𝑦𝑅)) → 𝐷 ∈ (∞Met‘𝑋))
14 simplr 791 . . . . 5 (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑅𝑋) ∧ (𝑥𝑅𝑦𝑅)) → 𝑅𝑋)
15 simprl 793 . . . . 5 (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑅𝑋) ∧ (𝑥𝑅𝑦𝑅)) → 𝑥𝑅)
1614, 15sseldd 3589 . . . 4 (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑅𝑋) ∧ (𝑥𝑅𝑦𝑅)) → 𝑥𝑋)
17 simprr 795 . . . . 5 (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑅𝑋) ∧ (𝑥𝑅𝑦𝑅)) → 𝑦𝑅)
1814, 17sseldd 3589 . . . 4 (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑅𝑋) ∧ (𝑥𝑅𝑦𝑅)) → 𝑦𝑋)
19 xmeteq0 22048 . . . 4 ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑥𝑋𝑦𝑋) → ((𝑥𝐷𝑦) = 0 ↔ 𝑥 = 𝑦))
2013, 16, 18, 19syl3anc 1323 . . 3 (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑅𝑋) ∧ (𝑥𝑅𝑦𝑅)) → ((𝑥𝐷𝑦) = 0 ↔ 𝑥 = 𝑦))
2112, 20bitrd 268 . 2 (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑅𝑋) ∧ (𝑥𝑅𝑦𝑅)) → ((𝑥(𝐷 ↾ (𝑅 × 𝑅))𝑦) = 0 ↔ 𝑥 = 𝑦))
22 simpll 789 . . . 4 (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑅𝑋) ∧ (𝑥𝑅𝑦𝑅𝑧𝑅)) → 𝐷 ∈ (∞Met‘𝑋))
23 simplr 791 . . . . 5 (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑅𝑋) ∧ (𝑥𝑅𝑦𝑅𝑧𝑅)) → 𝑅𝑋)
24 simpr3 1067 . . . . 5 (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑅𝑋) ∧ (𝑥𝑅𝑦𝑅𝑧𝑅)) → 𝑧𝑅)
2523, 24sseldd 3589 . . . 4 (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑅𝑋) ∧ (𝑥𝑅𝑦𝑅𝑧𝑅)) → 𝑧𝑋)
26163adantr3 1220 . . . 4 (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑅𝑋) ∧ (𝑥𝑅𝑦𝑅𝑧𝑅)) → 𝑥𝑋)
27183adantr3 1220 . . . 4 (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑅𝑋) ∧ (𝑥𝑅𝑦𝑅𝑧𝑅)) → 𝑦𝑋)
28 xmettri2 22050 . . . 4 ((𝐷 ∈ (∞Met‘𝑋) ∧ (𝑧𝑋𝑥𝑋𝑦𝑋)) → (𝑥𝐷𝑦) ≤ ((𝑧𝐷𝑥) +𝑒 (𝑧𝐷𝑦)))
2922, 25, 26, 27, 28syl13anc 1325 . . 3 (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑅𝑋) ∧ (𝑥𝑅𝑦𝑅𝑧𝑅)) → (𝑥𝐷𝑦) ≤ ((𝑧𝐷𝑥) +𝑒 (𝑧𝐷𝑦)))
30113adantr3 1220 . . 3 (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑅𝑋) ∧ (𝑥𝑅𝑦𝑅𝑧𝑅)) → (𝑥(𝐷 ↾ (𝑅 × 𝑅))𝑦) = (𝑥𝐷𝑦))
31 simpr1 1065 . . . . 5 (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑅𝑋) ∧ (𝑥𝑅𝑦𝑅𝑧𝑅)) → 𝑥𝑅)
3224, 31ovresd 6755 . . . 4 (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑅𝑋) ∧ (𝑥𝑅𝑦𝑅𝑧𝑅)) → (𝑧(𝐷 ↾ (𝑅 × 𝑅))𝑥) = (𝑧𝐷𝑥))
33 simpr2 1066 . . . . 5 (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑅𝑋) ∧ (𝑥𝑅𝑦𝑅𝑧𝑅)) → 𝑦𝑅)
3424, 33ovresd 6755 . . . 4 (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑅𝑋) ∧ (𝑥𝑅𝑦𝑅𝑧𝑅)) → (𝑧(𝐷 ↾ (𝑅 × 𝑅))𝑦) = (𝑧𝐷𝑦))
3532, 34oveq12d 6623 . . 3 (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑅𝑋) ∧ (𝑥𝑅𝑦𝑅𝑧𝑅)) → ((𝑧(𝐷 ↾ (𝑅 × 𝑅))𝑥) +𝑒 (𝑧(𝐷 ↾ (𝑅 × 𝑅))𝑦)) = ((𝑧𝐷𝑥) +𝑒 (𝑧𝐷𝑦)))
3629, 30, 353brtr4d 4650 . 2 (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑅𝑋) ∧ (𝑥𝑅𝑦𝑅𝑧𝑅)) → (𝑥(𝐷 ↾ (𝑅 × 𝑅))𝑦) ≤ ((𝑧(𝐷 ↾ (𝑅 × 𝑅))𝑥) +𝑒 (𝑧(𝐷 ↾ (𝑅 × 𝑅))𝑦)))
374, 9, 21, 36isxmetd 22036 1 ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑅𝑋) → (𝐷 ↾ (𝑅 × 𝑅)) ∈ (∞Met‘𝑅))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 196  wa 384  w3a 1036   = wceq 1480  wcel 1992  wss 3560   class class class wbr 4618   × cxp 5077  dom cdm 5079  cres 5081  wf 5846  cfv 5850  (class class class)co 6605  0cc0 9881  *cxr 10018  cle 10020   +𝑒 cxad 11888  ∞Metcxmt 19645
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1719  ax-4 1734  ax-5 1841  ax-6 1890  ax-7 1937  ax-8 1994  ax-9 2001  ax-10 2021  ax-11 2036  ax-12 2049  ax-13 2250  ax-ext 2606  ax-sep 4746  ax-nul 4754  ax-pow 4808  ax-pr 4872  ax-un 6903  ax-cnex 9937  ax-resscn 9938
This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3an 1038  df-tru 1483  df-ex 1702  df-nf 1707  df-sb 1883  df-eu 2478  df-mo 2479  df-clab 2613  df-cleq 2619  df-clel 2622  df-nfc 2756  df-ne 2797  df-ral 2917  df-rex 2918  df-rab 2921  df-v 3193  df-sbc 3423  df-dif 3563  df-un 3565  df-in 3567  df-ss 3574  df-nul 3897  df-if 4064  df-pw 4137  df-sn 4154  df-pr 4156  df-op 4160  df-uni 4408  df-br 4619  df-opab 4679  df-mpt 4680  df-id 4994  df-xp 5085  df-rel 5086  df-cnv 5087  df-co 5088  df-dm 5089  df-rn 5090  df-res 5091  df-iota 5813  df-fun 5852  df-fn 5853  df-f 5854  df-fv 5858  df-ov 6608  df-oprab 6609  df-mpt2 6610  df-map 7805  df-xr 10023  df-xmet 19653
This theorem is referenced by:  metres2  22073  xmetres  22074  xpsxmet  22090  xpsdsval  22091  xmetresbl  22147  tmsxms  22196  imasf1oxms  22199  metrest  22234  prdsxms  22240  tmsxpsval  22248  nrginvrcn  22401  divcn  22574  iitopon  22585  cncfmet  22614  cfilres  22997  dvlip2  23657  ftc1lem6  23703  ulmdvlem1  24053  ulmdvlem3  24055  abelth  24094  cxpcn3  24384  rlimcnp  24587  minvecolem4b  27574  minvecolem4  27576  ftc1cnnc  33083  blbnd  33185  ismtyres  33206  reheibor  33237
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