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At: is member non nil 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

v:T, M:T List. L = v.M

By: Inst Thm* eq:{T=}, L:T List, x:T. x(eq) L (M,N:T List. L = (M @ (x.N))) [T;eq;L;u]

Generated subgoal:

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

About:
listconsboolassertapplyfunctionuniverseequalmemberallexists

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