At:
not is member remove lemma11
1.
T: Type
2.
eq: {T=}
3.
x: T
4.
y: T
5.
L: T List
6.
eq(x,y)
7.
u: T
8.
v: T List
9.
x(eq) v x(eq) remove(eq;y;v)
10.
if eq(x,u) true else x(eq) v fi
x(eq) if eq(y,u) v else u.remove(eq;y;v) fi
By:
IfThenElseCases 0
Generated subgoals:
x(
eq) v
eq(x,y)
x(
true
