Metamath Proof Explorer |
< Previous
Next >
Nearby theorems |
||
Mirrors > Home > MPE Home > Th. List > ciin | Structured version Visualization version GIF version |
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 4743. 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 setvar class |
Copyright terms: Public domain | W3C validator |