Theorem xmeter 15301

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

Hypothesis

Ref	Expression
xmeter.1	|- .~ = ( `' D " RR )

Assertion

Ref	Expression
xmeter	|- ( D e. ( *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 " RR )
2		cnvimass 5125	. . . . 5 |- ( `' D " RR ) C_ dom D
3	1, 2	eqsstri 3270	. . . 4 |- .~ C_ dom D
4		xmetf 15215	. . . 4 |- ( D e. ( *Met ` X ) -> D : ( X X. X ) --> RR* )
5	3, 4	fssdm 5524	. . 3 |- ( D e. ( *Met ` X ) -> .~ C_ ( X X. X ) )
6		relxp 4859	. . 3 |- Rel ( X X. X )
7		relss 4837	. . 3 |- ( .~ C_ ( X X. X ) -> ( Rel ( X X. X ) -> Rel .~ ) )
8	5, 6, 7	mpisyl 1492	. 2 |- ( D e. ( *Met ` X ) -> Rel .~ )
9	1	xmeterval 15300	. . . . 5 |- ( D e. ( *Met ` X ) -> ( x .~ y <-> ( x e. X /\ y e. X /\ ( x D y ) e. RR ) ) )
10	9	biimpa 296	. . . 4 |- ( ( D e. ( *Met ` X ) /\ x .~ y ) -> ( x e. X /\ y e. X /\ ( x D y ) e. RR ) )
11	10	simp2d 1037	. . 3 |- ( ( D e. ( *Met ` X ) /\ x .~ y ) -> y e. X )
12	10	simp1d 1036	. . 3 |- ( ( D e. ( *Met ` X ) /\ x .~ y ) -> x e. X )
13		simpl 109	. . . . 5 |- ( ( D e. ( *Met ` X ) /\ x .~ y ) -> D e. ( *Met ` X ) )
14		xmetsym 15233	. . . . 5 |- ( ( D e. ( *Met ` X ) /\ x e. X /\ y e. X ) -> ( x D y ) = ( y D x ) )
15	13, 12, 11, 14	syl3anc 1274	. . . 4 |- ( ( D e. ( *Met ` X ) /\ x .~ y ) -> ( x D y ) = ( y D x ) )
16	10	simp3d 1038	. . . 4 |- ( ( D e. ( *Met ` X ) /\ x .~ y ) -> ( x D y ) e. RR )
17	15, 16	eqeltrrd 2310	. . 3 |- ( ( D e. ( *Met ` X ) /\ x .~ y ) -> ( y D x ) e. RR )
18	1	xmeterval 15300	. . . 4 |- ( D e. ( *Met ` X ) -> ( y .~ x <-> ( y e. X /\ x e. X /\ ( y D x ) e. RR ) ) )
19	18	adantr 276	. . 3 |- ( ( D e. ( *Met ` X ) /\ x .~ y ) -> ( y .~ x <-> ( y e. X /\ x e. X /\ ( y D x ) e. RR ) ) )
20	11, 12, 17, 19	mpbir3and 1207	. 2 |- ( ( D e. ( *Met ` X ) /\ x .~ y ) -> y .~ x )
21	12	adantrr 479	. . 3 |- ( ( D e. ( *Met ` X ) /\ ( x .~ y /\ y .~ z ) ) -> x e. X )
22	1	xmeterval 15300	. . . . . 6 |- ( D e. ( *Met ` X ) -> ( y .~ z <-> ( y e. X /\ z e. X /\ ( y D z ) e. RR ) ) )
23	22	biimpa 296	. . . . 5 |- ( ( D e. ( *Met ` X ) /\ y .~ z ) -> ( y e. X /\ z e. X /\ ( y D z ) e. RR ) )
24	23	adantrl 478	. . . 4 |- ( ( D e. ( *Met ` X ) /\ ( x .~ y /\ y .~ z ) ) -> ( y e. X /\ z e. X /\ ( y D z ) e. RR ) )
25	24	simp2d 1037	. . 3 |- ( ( D e. ( *Met ` X ) /\ ( x .~ y /\ y .~ z ) ) -> z e. X )
26		simpl 109	. . . 4 |- ( ( D e. ( *Met ` X ) /\ ( x .~ y /\ y .~ z ) ) -> D e. ( *Met ` X ) )
27	16	adantrr 479	. . . . 5 |- ( ( D e. ( *Met ` X ) /\ ( x .~ y /\ y .~ z ) ) -> ( x D y ) e. RR )
28	24	simp3d 1038	. . . . 5 |- ( ( D e. ( *Met ` X ) /\ ( x .~ y /\ y .~ z ) ) -> ( y D z ) e. RR )
29		rexadd 10185	. . . . . 6 |- ( ( ( x D y ) e. RR /\ ( y D z ) e. RR ) -> ( ( x D y ) +e ( y D z ) ) = ( ( x D y ) + ( y D z ) ) )
30		readdcl 8253	. . . . . 6 |- ( ( ( x D y ) e. RR /\ ( y D z ) e. RR ) -> ( ( x D y ) + ( y D z ) ) e. RR )
31	29, 30	eqeltrd 2309	. . . . 5 |- ( ( ( x D y ) e. RR /\ ( y D z ) e. RR ) -> ( ( x D y ) +e ( y D z ) ) e. RR )
32	27, 28, 31	syl2anc 411	. . . 4 |- ( ( D e. ( *Met ` X ) /\ ( x .~ y /\ y .~ z ) ) -> ( ( x D y ) +e ( y D z ) ) e. RR )
33	11	adantrr 479	. . . . 5 |- ( ( D e. ( *Met ` X ) /\ ( x .~ y /\ y .~ z ) ) -> y e. X )
34		xmettri 15237	. . . . 5 |- ( ( D e. ( *Met ` X ) /\ ( x e. X /\ z e. X /\ y e. X ) ) -> ( x D z ) <_ ( ( x D y ) +e ( y D z ) ) )
35	26, 21, 25, 33, 34	syl13anc 1276	. . . 4 |- ( ( D e. ( *Met ` X ) /\ ( x .~ y /\ y .~ z ) ) -> ( x D z ) <_ ( ( x D y ) +e ( y D z ) ) )
36		xmetlecl 15232	. . . 4 |- ( ( D e. ( *Met ` X ) /\ ( x e. X /\ z e. X ) /\ ( ( ( x D y ) +e ( y D z ) ) e. RR /\ ( x D z ) <_ ( ( x D y ) +e ( y D z ) ) ) ) -> ( x D z ) e. RR )
37	26, 21, 25, 32, 35, 36	syl122anc 1283	. . 3 |- ( ( D e. ( *Met ` X ) /\ ( x .~ y /\ y .~ z ) ) -> ( x D z ) e. RR )
38	1	xmeterval 15300	. . . 4 |- ( D e. ( *Met ` X ) -> ( x .~ z <-> ( x e. X /\ z e. X /\ ( x D z ) e. RR ) ) )
39	38	adantr 276	. . 3 |- ( ( D e. ( *Met ` X ) /\ ( x .~ y /\ y .~ z ) ) -> ( x .~ z <-> ( x e. X /\ z e. X /\ ( x D z ) e. RR ) ) )
40	21, 25, 37, 39	mpbir3and 1207	. 2 |- ( ( D e. ( *Met ` X ) /\ ( x .~ y /\ y .~ z ) ) -> x .~ z )
41		xmet0 15228	. . . . . . 7 |- ( ( D e. ( *Met ` X ) /\ x e. X ) -> ( x D x ) = 0 )
42		0re 8274	. . . . . . 7 |- 0 e. RR
43	41, 42	eqeltrdi 2323	. . . . . 6 |- ( ( D e. ( *Met ` X ) /\ x e. X ) -> ( x D x ) e. RR )
44	43	ex 115	. . . . 5 |- ( D e. ( *Met ` X ) -> ( x e. X -> ( x D x ) e. RR ) )
45	44	pm4.71rd 394	. . . 4 |- ( D e. ( *Met ` X ) -> ( x e. X <-> ( ( x D x ) e. RR /\ x e. X ) ) )
46		df-3an 1007	. . . . 5 |- ( ( x e. X /\ x e. X /\ ( x D x ) e. RR ) <-> ( ( x e. X /\ x e. X ) /\ ( x D x ) e. RR ) )
47		anidm 396	. . . . . 6 |- ( ( x e. X /\ x e. X ) <-> x e. X )
48	47	anbi2ci 459	. . . . 5 |- ( ( ( x e. X /\ x e. X ) /\ ( x D x ) e. RR ) <-> ( ( x D x ) e. RR /\ x e. X ) )
49	46, 48	bitri 184	. . . 4 |- ( ( x e. X /\ x e. X /\ ( x D x ) e. RR ) <-> ( ( x D x ) e. RR /\ x e. X ) )
50	45, 49	bitr4di 198	. . 3 |- ( D e. ( *Met ` X ) -> ( x e. X <-> ( x e. X /\ x e. X /\ ( x D x ) e. RR ) ) )
51	1	xmeterval 15300	. . 3 |- ( D e. ( *Met ` X ) -> ( x .~ x <-> ( x e. X /\ x e. X /\ ( x D x ) e. RR ) ) )
52	50, 51	bitr4d 191	. 2 |- ( D e. ( *Met ` X ) -> ( x e. X <-> x .~ x ) )
53	8, 20, 40, 52	iserd 6793	1 |- ( D e. ( *Met ` X ) -> .~ Er X )

Syntax hints:   -> wi 4   /\ wa 104   <-> wb 105   /\ w3a 1005   = wceq 1398   e. wcel 2203   C_ wss 3211   class class class wbr 4109   X. cxp 4747   `'ccnv 4748   dom cdm 4749   "cima 4752   Rel wrel 4754   ` cfv 5352  (class class class)co 6050   Er wer 6764   RRcr 8126   0cc0 8127   + caddc 8130   RR*cxr 8307   <_ cle 8309   +ecxad 10103   *Metcxmet 14684

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 619  ax-in2 620  ax-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-13 2205  ax-14 2206  ax-ext 2214  ax-sep 4228  ax-pow 4287  ax-pr 4322  ax-un 4554  ax-setind 4659  ax-cnex 8218  ax-resscn 8219  ax-1cn 8220  ax-1re 8221  ax-icn 8222  ax-addcl 8223  ax-addrcl 8224  ax-mulcl 8225  ax-mulrcl 8226  ax-addcom 8227  ax-mulcom 8228  ax-addass 8229  ax-mulass 8230  ax-distr 8231  ax-i2m1 8232  ax-0lt1 8233  ax-1rid 8234  ax-0id 8235  ax-rnegex 8236  ax-precex 8237  ax-cnre 8238  ax-pre-ltirr 8239  ax-pre-ltwlin 8240  ax-pre-lttrn 8241  ax-pre-apti 8242  ax-pre-ltadd 8243  ax-pre-mulgt0 8244

This theorem depends on definitions:  df-bi 117  df-dc 843  df-3or 1006  df-3an 1007  df-tru 1401  df-fal 1404  df-nf 1510  df-sb 1812  df-eu 2083  df-mo 2084  df-clab 2219  df-cleq 2225  df-clel 2228  df-nfc 2373  df-ne 2413  df-nel 2508  df-ral 2525  df-rex 2526  df-reu 2527  df-rab 2529  df-v 2815  df-sbc 3043  df-csb 3139  df-dif 3213  df-un 3215  df-in 3217  df-ss 3224  df-if 3621  df-pw 3671  df-sn 3695  df-pr 3696  df-op 3698  df-uni 3915  df-iun 3993  df-br 4110  df-opab 4172  df-mpt 4173  df-id 4414  df-po 4417  df-iso 4418  df-xp 4755  df-rel 4756  df-cnv 4757  df-co 4758  df-dm 4759  df-rn 4760  df-res 4761  df-ima 4762  df-iota 5312  df-fun 5354  df-fn 5355  df-f 5356  df-fv 5360  df-riota 6003  df-ov 6053  df-oprab 6054  df-mpo 6055  df-1st 6334  df-2nd 6335  df-er 6767  df-map 6884  df-pnf 8310  df-mnf 8311  df-xr 8312  df-ltxr 8313  df-le 8314  df-sub 8446  df-neg 8447  df-2 9296  df-xadd 10106  df-xmet 14692

This theorem is referenced by:  blpnfctr  15304  xmetresbl  15305