Theorem xblpnfps 15624

Description: The infinity ball in an extended metric is the set of all points that are a finite distance from the center. (Contributed by Mario Carneiro, 23-Aug-2015.) (Revised by Thierry Arnoux, 11-Mar-2018.)

Assertion

Ref	Expression
xblpnfps	|- ( ( D e. (PsMet ` X ) /\ P e. X ) -> ( A e. ( P ( ball ` D ) +oo ) <-> ( A e. X /\ ( P D A ) e. RR ) ) )

Proof of Theorem xblpnfps

Step	Hyp	Ref	Expression
1		pnfxr 8384	. . 3 |- +oo e. RR*
2		elblps 15616	. . 3 |- ( ( D e. (PsMet ` X ) /\ P e. X /\ +oo e. RR* ) -> ( A e. ( P ( ball ` D ) +oo ) <-> ( A e. X /\ ( P D A ) < +oo ) ) )
3	1, 2	mp3an3 1367	. 2 |- ( ( D e. (PsMet ` X ) /\ P e. X ) -> ( A e. ( P ( ball ` D ) +oo ) <-> ( A e. X /\ ( P D A ) < +oo ) ) )
4		psmetcl 15552	. . . . . . . 8 |- ( ( D e. (PsMet ` X ) /\ P e. X /\ A e. X ) -> ( P D A ) e. RR* )
5		psmetge0 15557	. . . . . . . 8 |- ( ( D e. (PsMet ` X ) /\ P e. X /\ A e. X ) -> 0 <_ ( P D A ) )
6		ge0nemnf 10243	. . . . . . . 8 |- ( ( ( P D A ) e. RR* /\ 0 <_ ( P D A ) ) -> ( P D A ) =/= -oo )
7	4, 5, 6	syl2anc 415	. . . . . . 7 |- ( ( D e. (PsMet ` X ) /\ P e. X /\ A e. X ) -> ( P D A ) =/= -oo )
8		nmnfgt 10237	. . . . . . . 8 |- ( ( P D A ) e. RR* -> ( -oo < ( P D A ) <-> ( P D A ) =/= -oo ) )
9	4, 8	syl 14	. . . . . . 7 |- ( ( D e. (PsMet ` X ) /\ P e. X /\ A e. X ) -> ( -oo < ( P D A ) <-> ( P D A ) =/= -oo ) )
10	7, 9	mpbird 167	. . . . . 6 |- ( ( D e. (PsMet ` X ) /\ P e. X /\ A e. X ) -> -oo < ( P D A ) )
11	10	biantrurd 305	. . . . 5 |- ( ( D e. (PsMet ` X ) /\ P e. X /\ A e. X ) -> ( ( P D A ) < +oo <-> ( -oo < ( P D A ) /\ ( P D A ) < +oo ) ) )
12		xrrebnd 10238	. . . . . 6 |- ( ( P D A ) e. RR* -> ( ( P D A ) e. RR <-> ( -oo < ( P D A ) /\ ( P D A ) < +oo ) ) )
13	4, 12	syl 14	. . . . 5 |- ( ( D e. (PsMet ` X ) /\ P e. X /\ A e. X ) -> ( ( P D A ) e. RR <-> ( -oo < ( P D A ) /\ ( P D A ) < +oo ) ) )
14	11, 13	bitr4d 191	. . . 4 |- ( ( D e. (PsMet ` X ) /\ P e. X /\ A e. X ) -> ( ( P D A ) < +oo <-> ( P D A ) e. RR ) )
15	14	3expa 1234	. . 3 |- ( ( ( D e. (PsMet ` X ) /\ P e. X ) /\ A e. X ) -> ( ( P D A ) < +oo <-> ( P D A ) e. RR ) )
16	15	pm5.32da 456	. 2 |- ( ( D e. (PsMet ` X ) /\ P e. X ) -> ( ( A e. X /\ ( P D A ) < +oo ) <-> ( A e. X /\ ( P D A ) e. RR ) ) )
17	3, 16	bitrd 188	1 |- ( ( D e. (PsMet ` X ) /\ P e. X ) -> ( A e. ( P ( ball ` D ) +oo ) <-> ( A e. X /\ ( P D A ) e. RR ) ) )

This proof depends on syntax axioms:   -> wi 4   /\ wa 104   <-> wb 105   /\ w3a 1009   e. wcel 2209   =/= wne 2420   class class class wbr 4131   ` cfv 5380  (class class class)co 6088   RRcr 8184   0cc0 8185   +oocpnf 8363   -oocmnf 8364   RR*cxr 8365   < clt 8366   <_ cle 8367  PsMetcpsmet 14981   ballcbl 14984

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 623  ax-in2 624  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-sep 4251  ax-pow 4313  ax-pr 4348  ax-un 4580  ax-setind 4686  ax-cnex 8276  ax-resscn 8277  ax-1cn 8278  ax-1re 8279  ax-icn 8280  ax-addcl 8281  ax-addrcl 8282  ax-mulcl 8283  ax-mulrcl 8284  ax-addcom 8285  ax-mulcom 8286  ax-addass 8287  ax-mulass 8288  ax-distr 8289  ax-i2m1 8290  ax-0lt1 8291  ax-1rid 8292  ax-0id 8293  ax-rnegex 8294  ax-precex 8295  ax-cnre 8296  ax-pre-ltirr 8297  ax-pre-ltwlin 8298  ax-pre-lttrn 8299  ax-pre-ltadd 8301  ax-pre-mulgt0 8302

This proof depends on definitions:  df-bi 117  df-dc 847  df-3or 1010  df-3an 1011  df-tru 1405  df-fal 1408  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ne 2421  df-nel 2516  df-ral 2533  df-rex 2534  df-reu 2535  df-rab 2537  df-v 2823  df-sbc 3052  df-csb 3148  df-dif 3222  df-un 3224  df-in 3226  df-ss 3233  df-if 3639  df-pw 3690  df-sn 3715  df-pr 3716  df-op 3718  df-uni 3936  df-iun 4014  df-br 4132  df-opab 4194  df-mpt 4195  df-id 4440  df-po 4443  df-iso 4444  df-xp 4782  df-rel 4783  df-cnv 4784  df-co 4785  df-dm 4786  df-rn 4787  df-res 4788  df-ima 4789  df-iota 5340  df-fun 5382  df-fn 5383  df-f 5384  df-fv 5388  df-riota 6041  df-ov 6091  df-oprab 6092  df-mpo 6093  df-1st 6378  df-2nd 6379  df-map 6928  df-pnf 8368  df-mnf 8369  df-xr 8370  df-ltxr 8371  df-le 8372  df-sub 8506  df-neg 8507  df-2 9372  df-xadd 10192  df-psmet 14989  df-bl 14992

This theorem is used by:  xblss2ps  15630