Nuprl - Pf decidable list exists 1 2 1 1 1

1. T: Type
2. P: TProp
3. L: T List
4. u: T
5. v: T List
6. Dec(xv.P(x))
7. Dec(P(u))

P(u) xv.P(x) (P(u) xv.P(x))

By: Unfold `decidable` 7 THEN Analyze 7

Generated subgoals:

1 7. P(u)
P(u) xv.P(x) (P(u) xv.P(x))

2 7. P(u)
P(u) xv.P(x) (P(u) xv.P(x))

About:

1	7. `P(u)` `P(u) xv.P(x) (P(u) xv.P(x))`
2	7. `P(u)` `P(u) xv.P(x) (P(u) xv.P(x))`