Nuprl - Pf list exists append lemma 1 2

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

M:T List. P(u) x(v @ M).P(x) P(u) xv.P(x) xM.P(x)

By: UnivCD

Generated subgoal:

1 7. M: T List
8. P(u) x(v @ M).P(x)
P(u) xv.P(x) xM.P(x)

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