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Theorem xblpnf 14904
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.)
Assertion
Ref Expression
xblpnf  |-  ( ( D  e.  ( *Met `  X )  /\  P  e.  X
)  ->  ( A  e.  ( P ( ball `  D ) +oo )  <->  ( A  e.  X  /\  ( P D A )  e.  RR ) ) )

Proof of Theorem xblpnf
StepHypRef Expression
1 pnfxr 8127 . . 3  |- +oo  e.  RR*
2 elbl 14896 . . 3  |-  ( ( D  e.  ( *Met `  X )  /\  P  e.  X  /\ +oo  e.  RR* )  ->  ( A  e.  ( P ( ball `  D
) +oo )  <->  ( A  e.  X  /\  ( P D A )  < +oo ) ) )
31, 2mp3an3 1339 . 2  |-  ( ( D  e.  ( *Met `  X )  /\  P  e.  X
)  ->  ( A  e.  ( P ( ball `  D ) +oo )  <->  ( A  e.  X  /\  ( P D A )  < +oo ) ) )
4 xmetcl 14857 . . . . . . . 8  |-  ( ( D  e.  ( *Met `  X )  /\  P  e.  X  /\  A  e.  X
)  ->  ( P D A )  e.  RR* )
5 xmetge0 14870 . . . . . . . 8  |-  ( ( D  e.  ( *Met `  X )  /\  P  e.  X  /\  A  e.  X
)  ->  0  <_  ( P D A ) )
6 ge0nemnf 9948 . . . . . . . 8  |-  ( ( ( P D A )  e.  RR*  /\  0  <_  ( P D A ) )  ->  ( P D A )  =/= -oo )
74, 5, 6syl2anc 411 . . . . . . 7  |-  ( ( D  e.  ( *Met `  X )  /\  P  e.  X  /\  A  e.  X
)  ->  ( P D A )  =/= -oo )
8 nmnfgt 9942 . . . . . . . 8  |-  ( ( P D A )  e.  RR*  ->  ( -oo  <  ( P D A )  <->  ( P D A )  =/= -oo ) )
94, 8syl 14 . . . . . . 7  |-  ( ( D  e.  ( *Met `  X )  /\  P  e.  X  /\  A  e.  X
)  ->  ( -oo  <  ( P D A )  <->  ( P D A )  =/= -oo ) )
107, 9mpbird 167 . . . . . 6  |-  ( ( D  e.  ( *Met `  X )  /\  P  e.  X  /\  A  e.  X
)  -> -oo  <  ( P D A ) )
1110biantrurd 305 . . . . 5  |-  ( ( D  e.  ( *Met `  X )  /\  P  e.  X  /\  A  e.  X
)  ->  ( ( P D A )  < +oo 
<->  ( -oo  <  ( P D A )  /\  ( P D A )  < +oo ) ) )
12 xrrebnd 9943 . . . . . 6  |-  ( ( P D A )  e.  RR*  ->  ( ( P D A )  e.  RR  <->  ( -oo  <  ( P D A )  /\  ( P D A )  < +oo ) ) )
134, 12syl 14 . . . . 5  |-  ( ( D  e.  ( *Met `  X )  /\  P  e.  X  /\  A  e.  X
)  ->  ( ( P D A )  e.  RR  <->  ( -oo  <  ( P D A )  /\  ( P D A )  < +oo ) ) )
1411, 13bitr4d 191 . . . 4  |-  ( ( D  e.  ( *Met `  X )  /\  P  e.  X  /\  A  e.  X
)  ->  ( ( P D A )  < +oo 
<->  ( P D A )  e.  RR ) )
15143expa 1206 . . 3  |-  ( ( ( D  e.  ( *Met `  X
)  /\  P  e.  X )  /\  A  e.  X )  ->  (
( P D A )  < +oo  <->  ( P D A )  e.  RR ) )
1615pm5.32da 452 . 2  |-  ( ( D  e.  ( *Met `  X )  /\  P  e.  X
)  ->  ( ( A  e.  X  /\  ( P D A )  < +oo )  <->  ( A  e.  X  /\  ( P D A )  e.  RR ) ) )
173, 16bitrd 188 1  |-  ( ( D  e.  ( *Met `  X )  /\  P  e.  X
)  ->  ( A  e.  ( P ( ball `  D ) +oo )  <->  ( A  e.  X  /\  ( P D A )  e.  RR ) ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 104    <-> wb 105    /\ w3a 981    e. wcel 2176    =/= wne 2376   class class class wbr 4045   ` cfv 5272  (class class class)co 5946   RRcr 7926   0cc0 7927   +oocpnf 8106   -oocmnf 8107   RR*cxr 8108    < clt 8109    <_ cle 8110   *Metcxmet 14331   ballcbl 14333
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 615  ax-in2 616  ax-io 711  ax-5 1470  ax-7 1471  ax-gen 1472  ax-ie1 1516  ax-ie2 1517  ax-8 1527  ax-10 1528  ax-11 1529  ax-i12 1530  ax-bndl 1532  ax-4 1533  ax-17 1549  ax-i9 1553  ax-ial 1557  ax-i5r 1558  ax-13 2178  ax-14 2179  ax-ext 2187  ax-sep 4163  ax-pow 4219  ax-pr 4254  ax-un 4481  ax-setind 4586  ax-cnex 8018  ax-resscn 8019  ax-1cn 8020  ax-1re 8021  ax-icn 8022  ax-addcl 8023  ax-addrcl 8024  ax-mulcl 8025  ax-mulrcl 8026  ax-addcom 8027  ax-mulcom 8028  ax-addass 8029  ax-mulass 8030  ax-distr 8031  ax-i2m1 8032  ax-0lt1 8033  ax-1rid 8034  ax-0id 8035  ax-rnegex 8036  ax-precex 8037  ax-cnre 8038  ax-pre-ltirr 8039  ax-pre-ltwlin 8040  ax-pre-lttrn 8041  ax-pre-ltadd 8043  ax-pre-mulgt0 8044
This theorem depends on definitions:  df-bi 117  df-dc 837  df-3or 982  df-3an 983  df-tru 1376  df-fal 1379  df-nf 1484  df-sb 1786  df-eu 2057  df-mo 2058  df-clab 2192  df-cleq 2198  df-clel 2201  df-nfc 2337  df-ne 2377  df-nel 2472  df-ral 2489  df-rex 2490  df-reu 2491  df-rab 2493  df-v 2774  df-sbc 2999  df-csb 3094  df-dif 3168  df-un 3170  df-in 3172  df-ss 3179  df-if 3572  df-pw 3618  df-sn 3639  df-pr 3640  df-op 3642  df-uni 3851  df-iun 3929  df-br 4046  df-opab 4107  df-mpt 4108  df-id 4341  df-po 4344  df-iso 4345  df-xp 4682  df-rel 4683  df-cnv 4684  df-co 4685  df-dm 4686  df-rn 4687  df-res 4688  df-ima 4689  df-iota 5233  df-fun 5274  df-fn 5275  df-f 5276  df-fv 5280  df-riota 5901  df-ov 5949  df-oprab 5950  df-mpo 5951  df-1st 6228  df-2nd 6229  df-map 6739  df-pnf 8111  df-mnf 8112  df-xr 8113  df-ltxr 8114  df-le 8115  df-sub 8247  df-neg 8248  df-2 9097  df-xadd 9897  df-psmet 14338  df-xmet 14339  df-bl 14341
This theorem is referenced by:  blpnf  14905  xmetec  14942
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