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Theorem metrel 15065
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 4858 . 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 14558 . . 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 4809 . 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 1397   A.wral 2510   {crab 2514   _Vcvv 2802   class class class wbr 4088    |-> cmpt 4150    X. cxp 4723   Rel wrel 4730  (class class class)co 6017    ^m cmap 6816   RRcr 8030   0cc0 8031    + caddc 8034    <_ cle 8214   Metcmet 14550
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 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-14 2205  ax-ext 2213  ax-sep 4207  ax-pow 4264  ax-pr 4299
This theorem depends on definitions:  df-bi 117  df-3an 1006  df-tru 1400  df-nf 1509  df-sb 1811  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2363  df-ral 2515  df-rex 2516  df-v 2804  df-un 3204  df-in 3206  df-ss 3213  df-pw 3654  df-sn 3675  df-pr 3676  df-op 3678  df-opab 4151  df-mpt 4152  df-xp 4731  df-rel 4732  df-met 14558
This theorem is referenced by:  metflem  15072  ismet2  15077
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