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At: discrete list 1 1 2 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

Dec(u.v = nil)
By:
UnfoldTopAb 0
THEN
DNth 2 0
Generated subgoal:

1 u.v = nil

About:
listconsnildecidableuniverseequalall

(44steps) PrintForm Definitions Lemmas list 3 jlc Sections Support(jlc) Doc