False 
(
M,N:T List, y:T. eq(x,y) & nil = (M @ (y.N)))10. v: T List
11. x(
eq) v (M,N:T List, y:T. eq(x,y) & v = (M @ (y.N))) if eq(x,u)
true
else x(eq) v fi (M,N:T List, y:T. eq(x,y) & u.v = (M @ (y.N)))
}
T
T
x:T. eq(x,x)
x,y:T. eq(x,y) 
eq(y,x)
x,y,z:T. eq(x,y) eq(y,z) eq(x,z)
eq) L
M,N:T List, y:T. eq(x,y) & L = (M @ (y.N))
| 1 | False (M,N:T List, y:T. eq(x,y) & nil = (M @ (y.N))) |
| 2 | 9. u: T 10. v: T List 11. x( eq) v (M,N:T List, y:T. eq(x,y) & v = (M @ (y.N))) if eq(x,u) true else x(eq) v fi (M,N:T List, y:T. eq(x,y) & u.v = (M @ (y.N))) |
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