Theorem xmeter 22048

Description: The "finitely separated" relation is an equivalence relation. (Contributed by Mario Carneiro, 24-Aug-2015.)

Hypothesis

Ref	Expression
xmeter.1	⊢ ∼ = (◡𝐷 “ ℝ)

Assertion

Ref	Expression
xmeter	⊢ (𝐷 ∈ (∞Met‘𝑋) → ∼ Er 𝑋)

Proof of Theorem xmeter

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

Step	Hyp	Ref	Expression
1		xmeter.1	. . . . 5 ⊢ ∼ = (◡𝐷 “ ℝ)
2		cnvimass 5404	. . . . 5 ⊢ (◡𝐷 “ ℝ) ⊆ dom 𝐷
3	1, 2	eqsstri 3598	. . . 4 ⊢ ∼ ⊆ dom 𝐷
4		xmetf 21944	. . . . 5 ⊢ (𝐷 ∈ (∞Met‘𝑋) → 𝐷:(𝑋 × 𝑋)⟶ℝ*)
5		fdm 5964	. . . . 5 ⊢ (𝐷:(𝑋 × 𝑋)⟶ℝ* → dom 𝐷 = (𝑋 × 𝑋))
6	4, 5	syl 17	. . . 4 ⊢ (𝐷 ∈ (∞Met‘𝑋) → dom 𝐷 = (𝑋 × 𝑋))
7	3, 6	syl5sseq 3616	. . 3 ⊢ (𝐷 ∈ (∞Met‘𝑋) → ∼ ⊆ (𝑋 × 𝑋))
8		relxp 5150	. . 3 ⊢ Rel (𝑋 × 𝑋)
9		relss 5129	. . 3 ⊢ ( ∼ ⊆ (𝑋 × 𝑋) → (Rel (𝑋 × 𝑋) → Rel ∼ ))
10	7, 8, 9	mpisyl 21	. 2 ⊢ (𝐷 ∈ (∞Met‘𝑋) → Rel ∼ )
11	1	xmeterval 22047	. . . . 5 ⊢ (𝐷 ∈ (∞Met‘𝑋) → (𝑥 ∼ 𝑦 ↔ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋 ∧ (𝑥𝐷𝑦) ∈ ℝ)))
12	11	biimpa 500	. . . 4 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑥 ∼ 𝑦) → (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋 ∧ (𝑥𝐷𝑦) ∈ ℝ))
13	12	simp2d 1067	. . 3 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑥 ∼ 𝑦) → 𝑦 ∈ 𝑋)
14	12	simp1d 1066	. . 3 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑥 ∼ 𝑦) → 𝑥 ∈ 𝑋)
15		simpl 472	. . . . 5 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑥 ∼ 𝑦) → 𝐷 ∈ (∞Met‘𝑋))
16		xmetsym 21962	. . . . 5 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋) → (𝑥𝐷𝑦) = (𝑦𝐷𝑥))
17	15, 14, 13, 16	syl3anc 1318	. . . 4 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑥 ∼ 𝑦) → (𝑥𝐷𝑦) = (𝑦𝐷𝑥))
18	12	simp3d 1068	. . . 4 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑥 ∼ 𝑦) → (𝑥𝐷𝑦) ∈ ℝ)
19	17, 18	eqeltrrd 2689	. . 3 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑥 ∼ 𝑦) → (𝑦𝐷𝑥) ∈ ℝ)
20	1	xmeterval 22047	. . . 4 ⊢ (𝐷 ∈ (∞Met‘𝑋) → (𝑦 ∼ 𝑥 ↔ (𝑦 ∈ 𝑋 ∧ 𝑥 ∈ 𝑋 ∧ (𝑦𝐷𝑥) ∈ ℝ)))
21	20	adantr 480	. . 3 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑥 ∼ 𝑦) → (𝑦 ∼ 𝑥 ↔ (𝑦 ∈ 𝑋 ∧ 𝑥 ∈ 𝑋 ∧ (𝑦𝐷𝑥) ∈ ℝ)))
22	13, 14, 19, 21	mpbir3and 1238	. 2 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑥 ∼ 𝑦) → 𝑦 ∼ 𝑥)
23	14	adantrr 749	. . 3 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ (𝑥 ∼ 𝑦 ∧ 𝑦 ∼ 𝑧)) → 𝑥 ∈ 𝑋)
24	1	xmeterval 22047	. . . . . 6 ⊢ (𝐷 ∈ (∞Met‘𝑋) → (𝑦 ∼ 𝑧 ↔ (𝑦 ∈ 𝑋 ∧ 𝑧 ∈ 𝑋 ∧ (𝑦𝐷𝑧) ∈ ℝ)))
25	24	biimpa 500	. . . . 5 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑦 ∼ 𝑧) → (𝑦 ∈ 𝑋 ∧ 𝑧 ∈ 𝑋 ∧ (𝑦𝐷𝑧) ∈ ℝ))
26	25	adantrl 748	. . . 4 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ (𝑥 ∼ 𝑦 ∧ 𝑦 ∼ 𝑧)) → (𝑦 ∈ 𝑋 ∧ 𝑧 ∈ 𝑋 ∧ (𝑦𝐷𝑧) ∈ ℝ))
27	26	simp2d 1067	. . 3 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ (𝑥 ∼ 𝑦 ∧ 𝑦 ∼ 𝑧)) → 𝑧 ∈ 𝑋)
28		simpl 472	. . . 4 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ (𝑥 ∼ 𝑦 ∧ 𝑦 ∼ 𝑧)) → 𝐷 ∈ (∞Met‘𝑋))
29	18	adantrr 749	. . . . 5 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ (𝑥 ∼ 𝑦 ∧ 𝑦 ∼ 𝑧)) → (𝑥𝐷𝑦) ∈ ℝ)
30	26	simp3d 1068	. . . . 5 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ (𝑥 ∼ 𝑦 ∧ 𝑦 ∼ 𝑧)) → (𝑦𝐷𝑧) ∈ ℝ)
31		rexadd 11937	. . . . . 6 ⊢ (((𝑥𝐷𝑦) ∈ ℝ ∧ (𝑦𝐷𝑧) ∈ ℝ) → ((𝑥𝐷𝑦) +𝑒 (𝑦𝐷𝑧)) = ((𝑥𝐷𝑦) + (𝑦𝐷𝑧)))
32		readdcl 9898	. . . . . 6 ⊢ (((𝑥𝐷𝑦) ∈ ℝ ∧ (𝑦𝐷𝑧) ∈ ℝ) → ((𝑥𝐷𝑦) + (𝑦𝐷𝑧)) ∈ ℝ)
33	31, 32	eqeltrd 2688	. . . . 5 ⊢ (((𝑥𝐷𝑦) ∈ ℝ ∧ (𝑦𝐷𝑧) ∈ ℝ) → ((𝑥𝐷𝑦) +𝑒 (𝑦𝐷𝑧)) ∈ ℝ)
34	29, 30, 33	syl2anc 691	. . . 4 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ (𝑥 ∼ 𝑦 ∧ 𝑦 ∼ 𝑧)) → ((𝑥𝐷𝑦) +𝑒 (𝑦𝐷𝑧)) ∈ ℝ)
35	13	adantrr 749	. . . . 5 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ (𝑥 ∼ 𝑦 ∧ 𝑦 ∼ 𝑧)) → 𝑦 ∈ 𝑋)
36		xmettri 21966	. . . . 5 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ (𝑥 ∈ 𝑋 ∧ 𝑧 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → (𝑥𝐷𝑧) ≤ ((𝑥𝐷𝑦) +𝑒 (𝑦𝐷𝑧)))
37	28, 23, 27, 35, 36	syl13anc 1320	. . . 4 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ (𝑥 ∼ 𝑦 ∧ 𝑦 ∼ 𝑧)) → (𝑥𝐷𝑧) ≤ ((𝑥𝐷𝑦) +𝑒 (𝑦𝐷𝑧)))
38		xmetlecl 21961	. . . 4 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ (𝑥 ∈ 𝑋 ∧ 𝑧 ∈ 𝑋) ∧ (((𝑥𝐷𝑦) +𝑒 (𝑦𝐷𝑧)) ∈ ℝ ∧ (𝑥𝐷𝑧) ≤ ((𝑥𝐷𝑦) +𝑒 (𝑦𝐷𝑧)))) → (𝑥𝐷𝑧) ∈ ℝ)
39	28, 23, 27, 34, 37, 38	syl122anc 1327	. . 3 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ (𝑥 ∼ 𝑦 ∧ 𝑦 ∼ 𝑧)) → (𝑥𝐷𝑧) ∈ ℝ)
40	1	xmeterval 22047	. . . 4 ⊢ (𝐷 ∈ (∞Met‘𝑋) → (𝑥 ∼ 𝑧 ↔ (𝑥 ∈ 𝑋 ∧ 𝑧 ∈ 𝑋 ∧ (𝑥𝐷𝑧) ∈ ℝ)))
41	40	adantr 480	. . 3 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ (𝑥 ∼ 𝑦 ∧ 𝑦 ∼ 𝑧)) → (𝑥 ∼ 𝑧 ↔ (𝑥 ∈ 𝑋 ∧ 𝑧 ∈ 𝑋 ∧ (𝑥𝐷𝑧) ∈ ℝ)))
42	23, 27, 39, 41	mpbir3and 1238	. 2 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ (𝑥 ∼ 𝑦 ∧ 𝑦 ∼ 𝑧)) → 𝑥 ∼ 𝑧)
43		xmet0 21957	. . . . . . 7 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑥 ∈ 𝑋) → (𝑥𝐷𝑥) = 0)
44		0re 9919	. . . . . . 7 ⊢ 0 ∈ ℝ
45	43, 44	syl6eqel 2696	. . . . . 6 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑥 ∈ 𝑋) → (𝑥𝐷𝑥) ∈ ℝ)
46	45	ex 449	. . . . 5 ⊢ (𝐷 ∈ (∞Met‘𝑋) → (𝑥 ∈ 𝑋 → (𝑥𝐷𝑥) ∈ ℝ))
47	46	pm4.71rd 665	. . . 4 ⊢ (𝐷 ∈ (∞Met‘𝑋) → (𝑥 ∈ 𝑋 ↔ ((𝑥𝐷𝑥) ∈ ℝ ∧ 𝑥 ∈ 𝑋)))
48		df-3an 1033	. . . . 5 ⊢ ((𝑥 ∈ 𝑋 ∧ 𝑥 ∈ 𝑋 ∧ (𝑥𝐷𝑥) ∈ ℝ) ↔ ((𝑥 ∈ 𝑋 ∧ 𝑥 ∈ 𝑋) ∧ (𝑥𝐷𝑥) ∈ ℝ))
49		anidm 674	. . . . . 6 ⊢ ((𝑥 ∈ 𝑋 ∧ 𝑥 ∈ 𝑋) ↔ 𝑥 ∈ 𝑋)
50	49	anbi2ci 728	. . . . 5 ⊢ (((𝑥 ∈ 𝑋 ∧ 𝑥 ∈ 𝑋) ∧ (𝑥𝐷𝑥) ∈ ℝ) ↔ ((𝑥𝐷𝑥) ∈ ℝ ∧ 𝑥 ∈ 𝑋))
51	48, 50	bitri 263	. . . 4 ⊢ ((𝑥 ∈ 𝑋 ∧ 𝑥 ∈ 𝑋 ∧ (𝑥𝐷𝑥) ∈ ℝ) ↔ ((𝑥𝐷𝑥) ∈ ℝ ∧ 𝑥 ∈ 𝑋))
52	47, 51	syl6bbr 277	. . 3 ⊢ (𝐷 ∈ (∞Met‘𝑋) → (𝑥 ∈ 𝑋 ↔ (𝑥 ∈ 𝑋 ∧ 𝑥 ∈ 𝑋 ∧ (𝑥𝐷𝑥) ∈ ℝ)))
53	1	xmeterval 22047	. . 3 ⊢ (𝐷 ∈ (∞Met‘𝑋) → (𝑥 ∼ 𝑥 ↔ (𝑥 ∈ 𝑋 ∧ 𝑥 ∈ 𝑋 ∧ (𝑥𝐷𝑥) ∈ ℝ)))
54	52, 53	bitr4d 270	. 2 ⊢ (𝐷 ∈ (∞Met‘𝑋) → (𝑥 ∈ 𝑋 ↔ 𝑥 ∼ 𝑥))
55	10, 22, 42, 54	iserd 7655	1 ⊢ (𝐷 ∈ (∞Met‘𝑋) → ∼ Er 𝑋)

Syntax hints:   → wi 4   ↔ wb 195   ∧ wa 383   ∧ w3a 1031   = wceq 1475   ∈ wcel 1977   ⊆ wss 3540   class class class wbr 4583   × cxp 5036  ^◡ccnv 5037  dom cdm 5038   “ cima 5041  Rel wrel 5043  ⟶wf 5800  ‘cfv 5804  (class class class)co 6549   Er wer 7626  ℝcr 9814  0cc0 9815   + caddc 9818  ℝ^*cxr 9952   ≤ cle 9954   +_𝑒 cxad 11820  ∞Metcxmt 19552

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1713  ax-4 1728  ax-5 1827  ax-6 1875  ax-7 1922  ax-8 1979  ax-9 1986  ax-10 2006  ax-11 2021  ax-12 2034  ax-13 2234  ax-ext 2590  ax-sep 4709  ax-nul 4717  ax-pow 4769  ax-pr 4833  ax-un 6847  ax-cnex 9871  ax-resscn 9872  ax-1cn 9873  ax-icn 9874  ax-addcl 9875  ax-addrcl 9876  ax-mulcl 9877  ax-mulrcl 9878  ax-mulcom 9879  ax-addass 9880  ax-mulass 9881  ax-distr 9882  ax-i2m1 9883  ax-1ne0 9884  ax-1rid 9885  ax-rnegex 9886  ax-rrecex 9887  ax-cnre 9888  ax-pre-lttri 9889  ax-pre-lttrn 9890  ax-pre-ltadd 9891  ax-pre-mulgt0 9892

This theorem depends on definitions:  df-bi 196  df-or 384  df-an 385  df-3or 1032  df-3an 1033  df-tru 1478  df-ex 1696  df-nf 1701  df-sb 1868  df-eu 2462  df-mo 2463  df-clab 2597  df-cleq 2603  df-clel 2606  df-nfc 2740  df-ne 2782  df-nel 2783  df-ral 2901  df-rex 2902  df-reu 2903  df-rmo 2904  df-rab 2905  df-v 3175  df-sbc 3403  df-csb 3500  df-dif 3543  df-un 3545  df-in 3547  df-ss 3554  df-nul 3875  df-if 4037  df-pw 4110  df-sn 4126  df-pr 4128  df-op 4132  df-uni 4373  df-iun 4457  df-br 4584  df-opab 4644  df-mpt 4645  df-id 4953  df-po 4959  df-so 4960  df-xp 5044  df-rel 5045  df-cnv 5046  df-co 5047  df-dm 5048  df-rn 5049  df-res 5050  df-ima 5051  df-iota 5768  df-fun 5806  df-fn 5807  df-f 5808  df-f1 5809  df-fo 5810  df-f1o 5811  df-fv 5812  df-riota 6511  df-ov 6552  df-oprab 6553  df-mpt2 6554  df-1st 7059  df-2nd 7060  df-er 7629  df-map 7746  df-en 7842  df-dom 7843  df-sdom 7844  df-pnf 9955  df-mnf 9956  df-xr 9957  df-ltxr 9958  df-le 9959  df-sub 10147  df-neg 10148  df-div 10564  df-2 10956  df-rp 11709  df-xneg 11822  df-xadd 11823  df-xmul 11824  df-xmet 19560

This theorem is referenced by:  blpnfctr  22051  xmetresbl  22052