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At: is member non nil 1 1
1. T: Type
2. eq: {T=}
3. eq TT
4. x,y:T. eq(x,y) x = y
5. u: T
6. L: T List
7. u(eq) L
8. M,N:T List. L = (M @ (u.N))

v:T, M:T List. L = v.M
By: Repeat (Analyze -1)
Generated subgoal:

18. M: T List
9. N: T List
10. L = (M @ (u.N))
v:T, M:T List. L = v.M

About:
listconsboolassertapplyfunctionuniverseequalmemberallexists

(8steps) PrintForm Definitions Lemmas list 3 jlc Sections Support(jlc) Doc