Syntax Definition ciin 3917

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 3874. 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 3919 for more information.