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Theorem elblps 12559
Description: Membership in a ball. (Contributed by NM, 2-Sep-2006.) (Revised by Mario Carneiro, 11-Nov-2013.) (Revised by Thierry Arnoux, 11-Mar-2018.)
Assertion
Ref Expression
elblps  |-  ( ( D  e.  (PsMet `  X )  /\  P  e.  X  /\  R  e. 
RR* )  ->  ( A  e.  ( P
( ball `  D ) R )  <->  ( A  e.  X  /\  ( P D A )  < 
R ) ) )

Proof of Theorem elblps
Dummy variable  x is distinct from all other variables.
StepHypRef Expression
1 blvalps 12557 . . 3  |-  ( ( D  e.  (PsMet `  X )  /\  P  e.  X  /\  R  e. 
RR* )  ->  ( P ( ball `  D
) R )  =  { x  e.  X  |  ( P D x )  <  R } )
21eleq2d 2209 . 2  |-  ( ( D  e.  (PsMet `  X )  /\  P  e.  X  /\  R  e. 
RR* )  ->  ( A  e.  ( P
( ball `  D ) R )  <->  A  e.  { x  e.  X  | 
( P D x )  <  R }
) )
3 oveq2 5782 . . . 4  |-  ( x  =  A  ->  ( P D x )  =  ( P D A ) )
43breq1d 3939 . . 3  |-  ( x  =  A  ->  (
( P D x )  <  R  <->  ( P D A )  <  R
) )
54elrab 2840 . 2  |-  ( A  e.  { x  e.  X  |  ( P D x )  < 
R }  <->  ( A  e.  X  /\  ( P D A )  < 
R ) )
62, 5syl6bb 195 1  |-  ( ( D  e.  (PsMet `  X )  /\  P  e.  X  /\  R  e. 
RR* )  ->  ( A  e.  ( P
( ball `  D ) R )  <->  ( A  e.  X  /\  ( P D A )  < 
R ) ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 103    <-> wb 104    /\ w3a 962    = wceq 1331    e. wcel 1480   {crab 2420   class class class wbr 3929   ` cfv 5123  (class class class)co 5774   RR*cxr 7799    < clt 7800  PsMetcpsmet 12148   ballcbl 12151
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 603  ax-in2 604  ax-io 698  ax-5 1423  ax-7 1424  ax-gen 1425  ax-ie1 1469  ax-ie2 1470  ax-8 1482  ax-10 1483  ax-11 1484  ax-i12 1485  ax-bndl 1486  ax-4 1487  ax-13 1491  ax-14 1492  ax-17 1506  ax-i9 1510  ax-ial 1514  ax-i5r 1515  ax-ext 2121  ax-sep 4046  ax-pow 4098  ax-pr 4131  ax-un 4355  ax-setind 4452  ax-cnex 7711  ax-resscn 7712
This theorem depends on definitions:  df-bi 116  df-3an 964  df-tru 1334  df-fal 1337  df-nf 1437  df-sb 1736  df-eu 2002  df-mo 2003  df-clab 2126  df-cleq 2132  df-clel 2135  df-nfc 2270  df-ne 2309  df-ral 2421  df-rex 2422  df-rab 2425  df-v 2688  df-sbc 2910  df-csb 3004  df-dif 3073  df-un 3075  df-in 3077  df-ss 3084  df-pw 3512  df-sn 3533  df-pr 3534  df-op 3536  df-uni 3737  df-iun 3815  df-br 3930  df-opab 3990  df-mpt 3991  df-id 4215  df-xp 4545  df-rel 4546  df-cnv 4547  df-co 4548  df-dm 4549  df-rn 4550  df-res 4551  df-ima 4552  df-iota 5088  df-fun 5125  df-fn 5126  df-f 5127  df-fv 5131  df-ov 5777  df-oprab 5778  df-mpo 5779  df-1st 6038  df-2nd 6039  df-map 6544  df-pnf 7802  df-mnf 7803  df-xr 7804  df-psmet 12156  df-bl 12159
This theorem is referenced by:  elbl2ps  12561  xblpnfps  12567  xblss2ps  12573  xblcntrps  12582  blssps  12596
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