Theorem xblpnfps 13038

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 7951	. . 3 |- +oo e. RR*
2		elblps 13030	. . 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 1316	. 2 |- ( ( D e. (PsMet ` X ) /\ P e. X ) -> ( A e. ( P ( ball ` D ) +oo ) <-> ( A e. X /\ ( P D A ) < +oo ) ) )
4		psmetcl 12966	. . . . . . . 8 |- ( ( D e. (PsMet ` X ) /\ P e. X /\ A e. X ) -> ( P D A ) e. RR* )
5		psmetge0 12971	. . . . . . . 8 |- ( ( D e. (PsMet ` X ) /\ P e. X /\ A e. X ) -> 0 <_ ( P D A ) )
6		ge0nemnf 9760	. . . . . . . 8 |- ( ( ( P D A ) e. RR* /\ 0 <_ ( P D A ) ) -> ( P D A ) =/= -oo )
7	4, 5, 6	syl2anc 409	. . . . . . 7 |- ( ( D e. (PsMet ` X ) /\ P e. X /\ A e. X ) -> ( P D A ) =/= -oo )
8		nmnfgt 9754	. . . . . . . 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 166	. . . . . 6 |- ( ( D e. (PsMet ` X ) /\ P e. X /\ A e. X ) -> -oo < ( P D A ) )
11	10	biantrurd 303	. . . . 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 9755	. . . . . 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 190	. . . 4 |- ( ( D e. (PsMet ` X ) /\ P e. X /\ A e. X ) -> ( ( P D A ) < +oo <-> ( P D A ) e. RR ) )
15	14	3expa 1193	. . 3 |- ( ( ( D e. (PsMet ` X ) /\ P e. X ) /\ A e. X ) -> ( ( P D A ) < +oo <-> ( P D A ) e. RR ) )
16	15	pm5.32da 448	. 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 187	1 |- ( ( D e. (PsMet ` X ) /\ P e. X ) -> ( A e. ( P ( ball ` D ) +oo ) <-> ( A e. X /\ ( P D A ) e. RR ) ) )

Syntax hints:   -> wi 4   /\ wa 103   <-> wb 104   /\ w3a 968   e. wcel 2136   =/= wne 2336   class class class wbr 3982   ` cfv 5188  (class class class)co 5842   RRcr 7752   0cc0 7753   +oocpnf 7930   -oocmnf 7931   RR*cxr 7932   < clt 7933   <_ cle 7934  PsMetcpsmet 12619   ballcbl 12622

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-in1 604  ax-in2 605  ax-io 699  ax-5 1435  ax-7 1436  ax-gen 1437  ax-ie1 1481  ax-ie2 1482  ax-8 1492  ax-10 1493  ax-11 1494  ax-i12 1495  ax-bndl 1497  ax-4 1498  ax-17 1514  ax-i9 1518  ax-ial 1522  ax-i5r 1523  ax-13 2138  ax-14 2139  ax-ext 2147  ax-sep 4100  ax-pow 4153  ax-pr 4187  ax-un 4411  ax-setind 4514  ax-cnex 7844  ax-resscn 7845  ax-1cn 7846  ax-1re 7847  ax-icn 7848  ax-addcl 7849  ax-addrcl 7850  ax-mulcl 7851  ax-mulrcl 7852  ax-addcom 7853  ax-mulcom 7854  ax-addass 7855  ax-mulass 7856  ax-distr 7857  ax-i2m1 7858  ax-0lt1 7859  ax-1rid 7860  ax-0id 7861  ax-rnegex 7862  ax-precex 7863  ax-cnre 7864  ax-pre-ltirr 7865  ax-pre-ltwlin 7866  ax-pre-lttrn 7867  ax-pre-ltadd 7869  ax-pre-mulgt0 7870

This theorem depends on definitions:  df-bi 116  df-dc 825  df-3or 969  df-3an 970  df-tru 1346  df-fal 1349  df-nf 1449  df-sb 1751  df-eu 2017  df-mo 2018  df-clab 2152  df-cleq 2158  df-clel 2161  df-nfc 2297  df-ne 2337  df-nel 2432  df-ral 2449  df-rex 2450  df-reu 2451  df-rab 2453  df-v 2728  df-sbc 2952  df-csb 3046  df-dif 3118  df-un 3120  df-in 3122  df-ss 3129  df-if 3521  df-pw 3561  df-sn 3582  df-pr 3583  df-op 3585  df-uni 3790  df-iun 3868  df-br 3983  df-opab 4044  df-mpt 4045  df-id 4271  df-po 4274  df-iso 4275  df-xp 4610  df-rel 4611  df-cnv 4612  df-co 4613  df-dm 4614  df-rn 4615  df-res 4616  df-ima 4617  df-iota 5153  df-fun 5190  df-fn 5191  df-f 5192  df-fv 5196  df-riota 5798  df-ov 5845  df-oprab 5846  df-mpo 5847  df-1st 6108  df-2nd 6109  df-map 6616  df-pnf 7935  df-mnf 7936  df-xr 7937  df-ltxr 7938  df-le 7939  df-sub 8071  df-neg 8072  df-2 8916  df-xadd 9709  df-psmet 12627  df-bl 12630

This theorem is referenced by:  xblss2ps  13044