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Definition df-mopn 12197
Description: Define a function whose value is the family of open sets of a metric space. (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 12191 . 2  class  MetOpen
2 vd . . 3  setvar  d
3 cxmet 12186 . . . . 5  class  *Met
43crn 4547 . . . 4  class  ran  *Met
54cuni 3743 . . 3  class  U. ran  *Met
62cv 1331 . . . . . 6  class  d
7 cbl 12188 . . . . . 6  class  ball
86, 7cfv 5130 . . . . 5  class  ( ball `  d )
98crn 4547 . . . 4  class  ran  ( ball `  d )
10 ctg 12172 . . . 4  class  topGen
119, 10cfv 5130 . . 3  class  ( topGen ` 
ran  ( ball `  d
) )
122, 5, 11cmpt 3996 . 2  class  ( d  e.  U. ran  *Met  |->  ( topGen `  ran  ( ball `  d )
) )
131, 12wceq 1332 1  wff  MetOpen  =  ( d  e.  U. ran  *Met  |->  ( topGen `  ran  ( ball `  d )
) )
Colors of variables: wff set class
This definition is referenced by:  mopnrel  12647  mopnval  12648  isxms2  12658
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