Nuprl - Pf decidable list exists 1 2 1 1 1 2 2 1

At: decidable list exists 1 2 1 1 1 2 2 1

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

False

By: OnHyps [6;7] (i.Unfold `not` i) THEN Analyze 8

Generated subgoals:

1 6. xv.P(x) False
7. P(u) False
8. P(u)
False

2 6. xv.P(x) False
7. P(u) False
8. xv.P(x)
False

About:

1	6. `xv.P(x) False` 7. `P(u) False` 8. `P(u)` `False`
2	6. `xv.P(x) False` 7. `P(u) False` 8. `xv.P(x)` `False`