7 lines
132 B
Text
7 lines
132 B
Text
|
import standard bool
|
||
|
|
using bool
|
||
|
|
|
||
|
|
definition set {{T : Type}} := T → bool
|
||
|
|
infix `∈`:50 := λx A, A x = '1
|
||
|
|
|
||
|
|
check 1 ∈ (λ x, '1)
|