Nuprl - Pf append is member lemma 1 1 1 1 2

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At: append is member lemma 1 1 1 1 2

1. T: Type
2. eq: {T=}
3. eq TT
4. x,y:T. eq(x,y) x = y
5. L: T List
6. x: T
7. M: T List
8. N: T List
9. u: T
10. v: T List
11. nil = (v @ (x.N)) False

nil = ((u.v) @ (x.N)) False

By: AbReduce 0 THEN Analyze 0

Generated subgoal:

1 12. nil = u.(v @ (x.N))
False

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