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At: decidable disjoint 1 2 1 1 2
1. T: Type
2. eq: TT
3. L1: T List
4. L2: T List
5. u: T
6. v: T List
7. xv.x(eq) L2
8. u(eq) L2

Dec(u(eq) L2 & xv.x(eq) L2)
By:
UnfoldTopAb 0
THEN
DNth 2 0
Generated subgoal:

1 (u(eq) L2 & xv.x(eq) L2)

About:
listboolassertdecidablefunctionuniverseand

(13steps) PrintForm Definitions list 3 jlc Sections Support(jlc) Doc