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Definition df-int 3864
Description: Define the intersection of a class. Definition 7.35 of [TakeutiZaring] p. 44. For example,  |^| { { 1 ,  3 } ,  { 1 ,  8 } }  =  {
1 }. Compare this with the intersection of two classes, df-in 3160. (Contributed by NM, 18-Aug-1993.)
Assertion
Ref Expression
df-int  |-  |^| A  =  { x  |  A. y ( y  e.  A  ->  x  e.  y ) }
Distinct variable group:    x, y, A

Detailed syntax breakdown of Definition df-int
StepHypRef Expression
1 cA . . 3  class  A
21cint 3863 . 2  class  |^| A
3 vy . . . . . . 7  set  y
43cv 1622 . . . . . 6  class  y
54, 1wcel 1685 . . . . 5  wff  y  e.  A
6 vx . . . . . 6  set  x
76, 3wel 1686 . . . . 5  wff  x  e.  y
85, 7wi 4 . . . 4  wff  ( y  e.  A  ->  x  e.  y )
98, 3wal 1527 . . 3  wff  A. y
( y  e.  A  ->  x  e.  y )
109, 6cab 2270 . 2  class  { x  |  A. y ( y  e.  A  ->  x  e.  y ) }
112, 10wceq 1623 1  wff  |^| A  =  { x  |  A. y ( y  e.  A  ->  x  e.  y ) }
Colors of variables: wff set class
This definition is referenced by:  dfint2  3865  elint  3869  int0  3877  dfiin2g  3937
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