At:
not is member remove lemma1111
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.
eq(x,u) = true
11.
true
12.
eq(y,u) = true
x(eq) v
By:
OnHyps [12;10]
(i.
FwdThru
Thm*P:. P P = true
[i])
Generated subgoal:
x(
eq) v
}
eq(x,y)
x(
i.
FwdThru
Thm* 
P:
. P 
