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Mirrors > Home > ILE Home > Th. List > ciin  Structured version GIF version 
Description: Extend class notation to include indexed intersection. Note: Historically (prior to 21Oct2005), set.mm used the notation ∩ x ∈ AB, with the same intersection symbol as cint 3606. Although that syntax was unambiguous, it did not allow for LALR parsing of the syntax constructions in set.mm. 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  setvar x 
cA  class A 
cB  class B 
Ref  Expression 

ciin  class ∩ x ∈ A B 
Colors of variables: wff set class 
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