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At: discrete list 1 1 2 2 1 1
1. T: Type
2. Discrete{T}
3. x: T List
4. u: T
5. v: T List
6. y:T List. Dec(v = y)
7. y: T List
8. u1: T
9. v1: T List
10. u.v = v1

u.v = u1.v1
By: Subst (v1 = u.v) 0
Generated subgoal:

1 u.v = [u1; u/ v]

About:
listconsconsdecidableuniverseequalall

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