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Theorem metrel 15136
Description: The class of metrics is a relation. (Contributed by Jim Kingdon, 20-Apr-2023.)
Assertion
Ref Expression
metrel  |-  Rel  Met

Proof of Theorem metrel
Dummy variables  e  d  x  y  z are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 mptrel 4864 . 2  |-  Rel  (
e  e.  _V  |->  { d  e.  ( RR 
^m  ( e  X.  e ) )  | 
A. x  e.  e 
A. y  e.  e  ( ( ( x d y )  =  0  <->  x  =  y
)  /\  A. z  e.  e  ( x
d y )  <_ 
( ( z d x )  +  ( z d y ) ) ) } )
2 df-met 14624 . . 3  |-  Met  =  ( e  e.  _V  |->  { d  e.  ( RR  ^m  ( e  X.  e ) )  |  A. x  e.  e  A. y  e.  e  ( ( ( x d y )  =  0  <->  x  =  y )  /\  A. z  e.  e  (
x d y )  <_  ( ( z d x )  +  ( z d y ) ) ) } )
32releqi 4815 . 2  |-  ( Rel 
Met 
<->  Rel  ( e  e. 
_V  |->  { d  e.  ( RR  ^m  (
e  X.  e ) )  |  A. x  e.  e  A. y  e.  e  ( (
( x d y )  =  0  <->  x  =  y )  /\  A. z  e.  e  ( x d y )  <_  ( ( z d x )  +  ( z d y ) ) ) } ) )
41, 3mpbir 146 1  |-  Rel  Met
Colors of variables: wff set class
Syntax hints:    /\ wa 104    <-> wb 105    = wceq 1398   A.wral 2511   {crab 2515   _Vcvv 2803   class class class wbr 4093    |-> cmpt 4155    X. cxp 4729   Rel wrel 4736  (class class class)co 6028    ^m cmap 6860   RRcr 8074   0cc0 8075    + caddc 8078    <_ cle 8257   Metcmet 14616
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-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-14 2205  ax-ext 2213  ax-sep 4212  ax-pow 4270  ax-pr 4305
This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-nf 1510  df-sb 1811  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2364  df-ral 2516  df-rex 2517  df-v 2805  df-un 3205  df-in 3207  df-ss 3214  df-pw 3658  df-sn 3679  df-pr 3680  df-op 3682  df-opab 4156  df-mpt 4157  df-xp 4737  df-rel 4738  df-met 14624
This theorem is referenced by:  metflem  15143  ismet2  15148
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