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Theorem metider 29716
 Description: The metric identification is an equivalence relation. (Contributed by Thierry Arnoux, 11-Feb-2018.)
Assertion
Ref Expression
metider (𝐷 ∈ (PsMet‘𝑋) → (~Met𝐷) Er 𝑋)

Proof of Theorem metider
Dummy variables 𝑥 𝑦 𝑧 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 metidss 29713 . . . 4 (𝐷 ∈ (PsMet‘𝑋) → (~Met𝐷) ⊆ (𝑋 × 𝑋))
2 xpss 5187 . . . 4 (𝑋 × 𝑋) ⊆ (V × V)
31, 2syl6ss 3595 . . 3 (𝐷 ∈ (PsMet‘𝑋) → (~Met𝐷) ⊆ (V × V))
4 df-rel 5081 . . 3 (Rel (~Met𝐷) ↔ (~Met𝐷) ⊆ (V × V))
53, 4sylibr 224 . 2 (𝐷 ∈ (PsMet‘𝑋) → Rel (~Met𝐷))
61ssbrd 4656 . . . . 5 (𝐷 ∈ (PsMet‘𝑋) → (𝑥(~Met𝐷)𝑦𝑥(𝑋 × 𝑋)𝑦))
76imp 445 . . . 4 ((𝐷 ∈ (PsMet‘𝑋) ∧ 𝑥(~Met𝐷)𝑦) → 𝑥(𝑋 × 𝑋)𝑦)
8 brxp 5107 . . . 4 (𝑥(𝑋 × 𝑋)𝑦 ↔ (𝑥𝑋𝑦𝑋))
97, 8sylib 208 . . 3 ((𝐷 ∈ (PsMet‘𝑋) ∧ 𝑥(~Met𝐷)𝑦) → (𝑥𝑋𝑦𝑋))
10 psmetsym 22025 . . . . . . . 8 ((𝐷 ∈ (PsMet‘𝑋) ∧ 𝑥𝑋𝑦𝑋) → (𝑥𝐷𝑦) = (𝑦𝐷𝑥))
11103expb 1263 . . . . . . 7 ((𝐷 ∈ (PsMet‘𝑋) ∧ (𝑥𝑋𝑦𝑋)) → (𝑥𝐷𝑦) = (𝑦𝐷𝑥))
1211eqeq1d 2623 . . . . . 6 ((𝐷 ∈ (PsMet‘𝑋) ∧ (𝑥𝑋𝑦𝑋)) → ((𝑥𝐷𝑦) = 0 ↔ (𝑦𝐷𝑥) = 0))
13 metidv 29714 . . . . . 6 ((𝐷 ∈ (PsMet‘𝑋) ∧ (𝑥𝑋𝑦𝑋)) → (𝑥(~Met𝐷)𝑦 ↔ (𝑥𝐷𝑦) = 0))
14 metidv 29714 . . . . . . 7 ((𝐷 ∈ (PsMet‘𝑋) ∧ (𝑦𝑋𝑥𝑋)) → (𝑦(~Met𝐷)𝑥 ↔ (𝑦𝐷𝑥) = 0))
1514ancom2s 843 . . . . . 6 ((𝐷 ∈ (PsMet‘𝑋) ∧ (𝑥𝑋𝑦𝑋)) → (𝑦(~Met𝐷)𝑥 ↔ (𝑦𝐷𝑥) = 0))
1612, 13, 153bitr4d 300 . . . . 5 ((𝐷 ∈ (PsMet‘𝑋) ∧ (𝑥𝑋𝑦𝑋)) → (𝑥(~Met𝐷)𝑦𝑦(~Met𝐷)𝑥))
1716biimpd 219 . . . 4 ((𝐷 ∈ (PsMet‘𝑋) ∧ (𝑥𝑋𝑦𝑋)) → (𝑥(~Met𝐷)𝑦𝑦(~Met𝐷)𝑥))
1817impancom 456 . . 3 ((𝐷 ∈ (PsMet‘𝑋) ∧ 𝑥(~Met𝐷)𝑦) → ((𝑥𝑋𝑦𝑋) → 𝑦(~Met𝐷)𝑥))
199, 18mpd 15 . 2 ((𝐷 ∈ (PsMet‘𝑋) ∧ 𝑥(~Met𝐷)𝑦) → 𝑦(~Met𝐷)𝑥)
20 simpl 473 . . . . . 6 ((𝐷 ∈ (PsMet‘𝑋) ∧ (𝑥(~Met𝐷)𝑦𝑦(~Met𝐷)𝑧)) → 𝐷 ∈ (PsMet‘𝑋))
21 simprr 795 . . . . . . . 8 ((𝐷 ∈ (PsMet‘𝑋) ∧ (𝑥(~Met𝐷)𝑦𝑦(~Met𝐷)𝑧)) → 𝑦(~Met𝐷)𝑧)
221ssbrd 4656 . . . . . . . . . 10 (𝐷 ∈ (PsMet‘𝑋) → (𝑦(~Met𝐷)𝑧𝑦(𝑋 × 𝑋)𝑧))
2322imp 445 . . . . . . . . 9 ((𝐷 ∈ (PsMet‘𝑋) ∧ 𝑦(~Met𝐷)𝑧) → 𝑦(𝑋 × 𝑋)𝑧)
24 brxp 5107 . . . . . . . . 9 (𝑦(𝑋 × 𝑋)𝑧 ↔ (𝑦𝑋𝑧𝑋))
2523, 24sylib 208 . . . . . . . 8 ((𝐷 ∈ (PsMet‘𝑋) ∧ 𝑦(~Met𝐷)𝑧) → (𝑦𝑋𝑧𝑋))
2621, 25syldan 487 . . . . . . 7 ((𝐷 ∈ (PsMet‘𝑋) ∧ (𝑥(~Met𝐷)𝑦𝑦(~Met𝐷)𝑧)) → (𝑦𝑋𝑧𝑋))
2726simpld 475 . . . . . 6 ((𝐷 ∈ (PsMet‘𝑋) ∧ (𝑥(~Met𝐷)𝑦𝑦(~Met𝐷)𝑧)) → 𝑦𝑋)
28 simprl 793 . . . . . . . 8 ((𝐷 ∈ (PsMet‘𝑋) ∧ (𝑥(~Met𝐷)𝑦𝑦(~Met𝐷)𝑧)) → 𝑥(~Met𝐷)𝑦)
2928, 9syldan 487 . . . . . . 7 ((𝐷 ∈ (PsMet‘𝑋) ∧ (𝑥(~Met𝐷)𝑦𝑦(~Met𝐷)𝑧)) → (𝑥𝑋𝑦𝑋))
3029simpld 475 . . . . . 6 ((𝐷 ∈ (PsMet‘𝑋) ∧ (𝑥(~Met𝐷)𝑦𝑦(~Met𝐷)𝑧)) → 𝑥𝑋)
3126simprd 479 . . . . . 6 ((𝐷 ∈ (PsMet‘𝑋) ∧ (𝑥(~Met𝐷)𝑦𝑦(~Met𝐷)𝑧)) → 𝑧𝑋)
32 psmettri2 22024 . . . . . 6 ((𝐷 ∈ (PsMet‘𝑋) ∧ (𝑦𝑋𝑥𝑋𝑧𝑋)) → (𝑥𝐷𝑧) ≤ ((𝑦𝐷𝑥) +𝑒 (𝑦𝐷𝑧)))
3320, 27, 30, 31, 32syl13anc 1325 . . . . 5 ((𝐷 ∈ (PsMet‘𝑋) ∧ (𝑥(~Met𝐷)𝑦𝑦(~Met𝐷)𝑧)) → (𝑥𝐷𝑧) ≤ ((𝑦𝐷𝑥) +𝑒 (𝑦𝐷𝑧)))
3429, 11syldan 487 . . . . . . . 8 ((𝐷 ∈ (PsMet‘𝑋) ∧ (𝑥(~Met𝐷)𝑦𝑦(~Met𝐷)𝑧)) → (𝑥𝐷𝑦) = (𝑦𝐷𝑥))
3529, 13syldan 487 . . . . . . . . 9 ((𝐷 ∈ (PsMet‘𝑋) ∧ (𝑥(~Met𝐷)𝑦𝑦(~Met𝐷)𝑧)) → (𝑥(~Met𝐷)𝑦 ↔ (𝑥𝐷𝑦) = 0))
3628, 35mpbid 222 . . . . . . . 8 ((𝐷 ∈ (PsMet‘𝑋) ∧ (𝑥(~Met𝐷)𝑦𝑦(~Met𝐷)𝑧)) → (𝑥𝐷𝑦) = 0)
3734, 36eqtr3d 2657 . . . . . . 7 ((𝐷 ∈ (PsMet‘𝑋) ∧ (𝑥(~Met𝐷)𝑦𝑦(~Met𝐷)𝑧)) → (𝑦𝐷𝑥) = 0)
38 metidv 29714 . . . . . . . . 9 ((𝐷 ∈ (PsMet‘𝑋) ∧ (𝑦𝑋𝑧𝑋)) → (𝑦(~Met𝐷)𝑧 ↔ (𝑦𝐷𝑧) = 0))
3926, 38syldan 487 . . . . . . . 8 ((𝐷 ∈ (PsMet‘𝑋) ∧ (𝑥(~Met𝐷)𝑦𝑦(~Met𝐷)𝑧)) → (𝑦(~Met𝐷)𝑧 ↔ (𝑦𝐷𝑧) = 0))
4021, 39mpbid 222 . . . . . . 7 ((𝐷 ∈ (PsMet‘𝑋) ∧ (𝑥(~Met𝐷)𝑦𝑦(~Met𝐷)𝑧)) → (𝑦𝐷𝑧) = 0)
4137, 40oveq12d 6622 . . . . . 6 ((𝐷 ∈ (PsMet‘𝑋) ∧ (𝑥(~Met𝐷)𝑦𝑦(~Met𝐷)𝑧)) → ((𝑦𝐷𝑥) +𝑒 (𝑦𝐷𝑧)) = (0 +𝑒 0))
42 0xr 10030 . . . . . . 7 0 ∈ ℝ*
43 xaddid1 12015 . . . . . . 7 (0 ∈ ℝ* → (0 +𝑒 0) = 0)
4442, 43ax-mp 5 . . . . . 6 (0 +𝑒 0) = 0
4541, 44syl6eq 2671 . . . . 5 ((𝐷 ∈ (PsMet‘𝑋) ∧ (𝑥(~Met𝐷)𝑦𝑦(~Met𝐷)𝑧)) → ((𝑦𝐷𝑥) +𝑒 (𝑦𝐷𝑧)) = 0)
4633, 45breqtrd 4639 . . . 4 ((𝐷 ∈ (PsMet‘𝑋) ∧ (𝑥(~Met𝐷)𝑦𝑦(~Met𝐷)𝑧)) → (𝑥𝐷𝑧) ≤ 0)
47 psmetge0 22027 . . . . 5 ((𝐷 ∈ (PsMet‘𝑋) ∧ 𝑥𝑋𝑧𝑋) → 0 ≤ (𝑥𝐷𝑧))
4820, 30, 31, 47syl3anc 1323 . . . 4 ((𝐷 ∈ (PsMet‘𝑋) ∧ (𝑥(~Met𝐷)𝑦𝑦(~Met𝐷)𝑧)) → 0 ≤ (𝑥𝐷𝑧))
49 psmetcl 22022 . . . . . 6 ((𝐷 ∈ (PsMet‘𝑋) ∧ 𝑥𝑋𝑧𝑋) → (𝑥𝐷𝑧) ∈ ℝ*)
5020, 30, 31, 49syl3anc 1323 . . . . 5 ((𝐷 ∈ (PsMet‘𝑋) ∧ (𝑥(~Met𝐷)𝑦𝑦(~Met𝐷)𝑧)) → (𝑥𝐷𝑧) ∈ ℝ*)
51 xrletri3 11929 . . . . 5 (((𝑥𝐷𝑧) ∈ ℝ* ∧ 0 ∈ ℝ*) → ((𝑥𝐷𝑧) = 0 ↔ ((𝑥𝐷𝑧) ≤ 0 ∧ 0 ≤ (𝑥𝐷𝑧))))
5250, 42, 51sylancl 693 . . . 4 ((𝐷 ∈ (PsMet‘𝑋) ∧ (𝑥(~Met𝐷)𝑦𝑦(~Met𝐷)𝑧)) → ((𝑥𝐷𝑧) = 0 ↔ ((𝑥𝐷𝑧) ≤ 0 ∧ 0 ≤ (𝑥𝐷𝑧))))
5346, 48, 52mpbir2and 956 . . 3 ((𝐷 ∈ (PsMet‘𝑋) ∧ (𝑥(~Met𝐷)𝑦𝑦(~Met𝐷)𝑧)) → (𝑥𝐷𝑧) = 0)
54 metidv 29714 . . . 4 ((𝐷 ∈ (PsMet‘𝑋) ∧ (𝑥𝑋𝑧𝑋)) → (𝑥(~Met𝐷)𝑧 ↔ (𝑥𝐷𝑧) = 0))
5520, 30, 31, 54syl12anc 1321 . . 3 ((𝐷 ∈ (PsMet‘𝑋) ∧ (𝑥(~Met𝐷)𝑦𝑦(~Met𝐷)𝑧)) → (𝑥(~Met𝐷)𝑧 ↔ (𝑥𝐷𝑧) = 0))
5653, 55mpbird 247 . 2 ((𝐷 ∈ (PsMet‘𝑋) ∧ (𝑥(~Met𝐷)𝑦𝑦(~Met𝐷)𝑧)) → 𝑥(~Met𝐷)𝑧)
57 psmet0 22023 . . . 4 ((𝐷 ∈ (PsMet‘𝑋) ∧ 𝑥𝑋) → (𝑥𝐷𝑥) = 0)
58 metidv 29714 . . . . 5 ((𝐷 ∈ (PsMet‘𝑋) ∧ (𝑥𝑋𝑥𝑋)) → (𝑥(~Met𝐷)𝑥 ↔ (𝑥𝐷𝑥) = 0))
5958anabsan2 862 . . . 4 ((𝐷 ∈ (PsMet‘𝑋) ∧ 𝑥𝑋) → (𝑥(~Met𝐷)𝑥 ↔ (𝑥𝐷𝑥) = 0))
6057, 59mpbird 247 . . 3 ((𝐷 ∈ (PsMet‘𝑋) ∧ 𝑥𝑋) → 𝑥(~Met𝐷)𝑥)
611ssbrd 4656 . . . . . 6 (𝐷 ∈ (PsMet‘𝑋) → (𝑥(~Met𝐷)𝑥𝑥(𝑋 × 𝑋)𝑥))
6261imp 445 . . . . 5 ((𝐷 ∈ (PsMet‘𝑋) ∧ 𝑥(~Met𝐷)𝑥) → 𝑥(𝑋 × 𝑋)𝑥)
63 brxp 5107 . . . . 5 (𝑥(𝑋 × 𝑋)𝑥 ↔ (𝑥𝑋𝑥𝑋))
6462, 63sylib 208 . . . 4 ((𝐷 ∈ (PsMet‘𝑋) ∧ 𝑥(~Met𝐷)𝑥) → (𝑥𝑋𝑥𝑋))
6564simpld 475 . . 3 ((𝐷 ∈ (PsMet‘𝑋) ∧ 𝑥(~Met𝐷)𝑥) → 𝑥𝑋)
6660, 65impbida 876 . 2 (𝐷 ∈ (PsMet‘𝑋) → (𝑥𝑋𝑥(~Met𝐷)𝑥))
675, 19, 56, 66iserd 7713 1 (𝐷 ∈ (PsMet‘𝑋) → (~Met𝐷) Er 𝑋)
 Colors of variables: wff setvar class Syntax hints:   → wi 4   ↔ wb 196   ∧ wa 384   = wceq 1480   ∈ wcel 1987  Vcvv 3186   ⊆ wss 3555   class class class wbr 4613   × cxp 5072  Rel wrel 5079  ‘cfv 5847  (class class class)co 6604   Er wer 7684  0cc0 9880  ℝ*cxr 10017   ≤ cle 10019   +𝑒 cxad 11888  PsMetcpsmet 19649  ~Metcmetid 29708 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 1836  ax-6 1885  ax-7 1932  ax-8 1989  ax-9 1996  ax-10 2016  ax-11 2031  ax-12 2044  ax-13 2245  ax-ext 2601  ax-sep 4741  ax-nul 4749  ax-pow 4803  ax-pr 4867  ax-un 6902  ax-cnex 9936  ax-resscn 9937  ax-1cn 9938  ax-icn 9939  ax-addcl 9940  ax-addrcl 9941  ax-mulcl 9942  ax-mulrcl 9943  ax-mulcom 9944  ax-addass 9945  ax-mulass 9946  ax-distr 9947  ax-i2m1 9948  ax-1ne0 9949  ax-1rid 9950  ax-rnegex 9951  ax-rrecex 9952  ax-cnre 9953  ax-pre-lttri 9954  ax-pre-lttrn 9955  ax-pre-ltadd 9956  ax-pre-mulgt0 9957 This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3or 1037  df-3an 1038  df-tru 1483  df-ex 1702  df-nf 1707  df-sb 1878  df-eu 2473  df-mo 2474  df-clab 2608  df-cleq 2614  df-clel 2617  df-nfc 2750  df-ne 2791  df-nel 2894  df-ral 2912  df-rex 2913  df-reu 2914  df-rmo 2915  df-rab 2916  df-v 3188  df-sbc 3418  df-csb 3515  df-dif 3558  df-un 3560  df-in 3562  df-ss 3569  df-nul 3892  df-if 4059  df-pw 4132  df-sn 4149  df-pr 4151  df-op 4155  df-uni 4403  df-iun 4487  df-br 4614  df-opab 4674  df-mpt 4675  df-id 4989  df-po 4995  df-so 4996  df-xp 5080  df-rel 5081  df-cnv 5082  df-co 5083  df-dm 5084  df-rn 5085  df-res 5086  df-ima 5087  df-iota 5810  df-fun 5849  df-fn 5850  df-f 5851  df-f1 5852  df-fo 5853  df-f1o 5854  df-fv 5855  df-riota 6565  df-ov 6607  df-oprab 6608  df-mpt2 6609  df-1st 7113  df-2nd 7114  df-er 7687  df-map 7804  df-en 7900  df-dom 7901  df-sdom 7902  df-pnf 10020  df-mnf 10021  df-xr 10022  df-ltxr 10023  df-le 10024  df-sub 10212  df-neg 10213  df-div 10629  df-2 11023  df-rp 11777  df-xneg 11890  df-xadd 11891  df-xmul 11892  df-psmet 19657  df-metid 29710 This theorem is referenced by:  pstmxmet  29719
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