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Syntax Definition ciin 3649
Description: Extend class notation to include indexed intersection. Note: Historically (prior to 21-Oct-2005), 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.
Hypotheses
Ref Expression
vx setvar x
cA class A
cB class B
Assertion
Ref Expression
ciin class x A B

See definition df-iin 3651 for more information.

Colors of variables: wff set class
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