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Definition df-mopn 16653
Description: Define a function whose value is the family of open sets of a metric space. See elmopn 18425 for its main property. (Contributed by NM, 1-Sep-2006.)
Assertion
Ref Expression
df-mopn  |-  MetOpen  =  ( d  e.  U. ran  * Met  |->  ( topGen `  ran  ( ball `  d )
) )

Detailed syntax breakdown of Definition df-mopn
StepHypRef Expression
1 cmopn 16646 . 2  class  MetOpen
2 vd . . 3  set  d
3 cxmt 16641 . . . . 5  class  * Met
43crn 4838 . . . 4  class  ran  * Met
54cuni 3975 . . 3  class  U. ran  * Met
62cv 1648 . . . . . 6  class  d
7 cbl 16643 . . . . . 6  class  ball
86, 7cfv 5413 . . . . 5  class  ( ball `  d )
98crn 4838 . . . 4  class  ran  ( ball `  d )
10 ctg 13620 . . . 4  class  topGen
119, 10cfv 5413 . . 3  class  ( topGen ` 
ran  ( ball `  d
) )
122, 5, 11cmpt 4226 . 2  class  ( d  e.  U. ran  * Met  |->  ( topGen `  ran  ( ball `  d )
) )
131, 12wceq 1649 1  wff  MetOpen  =  ( d  e.  U. ran  * Met  |->  ( topGen `  ran  ( ball `  d )
) )
Colors of variables: wff set class
This definition is referenced by:  mopnval  18421  isxms2  18431  setsmstopn  18461  tngtopn  18644
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