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Syntax Definition ciin 3906
Description: Extend class notation to include indexed intersection. Note: Historically (prior to 21-Oct-2005), used the notation  |^| x  e.  A B, with the same intersection symbol as cint 3862. Although that syntax was unambiguous, it did not allow for LALR parsing of the syntax constructions in The new syntax uses a distinguished symbol  |^|_ instead of  |^| and does allow LALR parsing. Thanks to Peter Backes for suggesting this change.
Ref Expression
vx  set  x
cA  class  A
cB  class  B
Ref Expression
ciin  class  |^|_ x  e.  A  B

See definition df-iin 3908 for more information.

Colors of variables: wff set class
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