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At: action append 1

1. T: Type
2. S: ActionSet(T)
3. s: S.car
4. tl1: T*
5. tl2: T*

(S:tl1 @ tl2s) = (S:tl1(S:tl2s))

By:
ListInd -2
THEN
RecUnfold `maction` 0
THEN
Reduce 0
THEN
RecFold `maction` 0


Generated subgoal:

16. u: T
7. v: T*
8. (S:v @ tl2s) = (S:v(S:tl2s))
S.act(u,(S:v @ tl2s)) = S.act(u,(S:v(S:tl2s)))


About:
equaluniverselistapply