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Syntax Definition ciin 3686
Description: Extend class notation to include indexed intersection. Note: Historically (prior to 21-Oct-2005), set.mm used the notation 𝑥𝐴𝐵, with the same intersection symbol as cint 3643. 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 𝑥𝐴 𝐵

See definition df-iin 3688 for more information.

Colors of variables: wff set class
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