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

Dec(P(u) xv.P(x))
By: Unfold `decidable` 0
Generated subgoal:

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

About:
listdecidablefunctionuniverseproporall

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