At:
list exists exists1221131112111
1.
T: Type
2.
eq: {T=}
3.
eq TT
4.
P: TType
5.
L: T List
6.
u: T
7.
v: T List
8.
xv.P(x) (x:{x:T| x(eq) v }. P(x))
9.
xv.P(x) (x:{x:T| x(eq) v }. P(x))
10.
x: T
11.
eq(x,u) = true
12.
true
13.
P(x)
14.
x = u
15.
eq(x,u) x = u
x(eq) v
By:
FwdThru
Thm*P:. P P = true
[11]
Generated subgoal:
x(
eq) v
}
T
x
(
x = u
P:
