Nuprl - Pf list exists append lemma 1 2 1 2 1 2

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At: list exists append lemma 1 2 1 2 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)
7. M: T List
8. x(v @ M).P(x)
9. xM.P(x)

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

By: Choose [2] THEN Trivial

Generated subgoals:

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