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At: is member equality strengthening lemma 1 1
1. T: Type
2. equiv: {T}
3. eq: {T=}
4. u: T
5. L: T List
6. u(equiv) L
7. M: T List
8. N: T List
9. y: T
10. equiv(u,y)
11. L = (M @ (y.N))

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

112. x:T. (M,N:T List. L = (M @ (x.N))) x(eq) L
v:T. equiv(u,v) & v(eq) L

About:
listconsassertapplyuniverseequalandexists

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