At:
append commutes under is member
2
1
1
1
1.
T: Type
2.
eq: {T
}
3.
eq 
T
T
4.
x:T. eq(x,x)
5.
x,y:T. eq(x,y) 
eq(y,x)
6.
x,y,z:T. eq(x,y) 
eq(y,z) eq(x,z)
7.
L: T List
8.
M: T List
9.
x: T
10.
x(eq) (M @ L)
11.
x(eq) M
x(eq) L 
x(eq) M
By:
Choose [2]
Generated subgoals:
None
About:
