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At: l disjoint append
T:Type, a,b,c:T List. l_disjoint(T;a @ b;c) l_disjoint(T;a;c) & l_disjoint(T;b;c)
By:
Unfold `l_disjoint` 0
THEN
RWO Thm* x:T, l1,l2:T List. (x l1 @ l2) (x l1) (x l2) 0
THEN
Obvious
Generated subgoals:

None

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listuniverseandorall

PrintForm Definitions Lemmas graph 1 1 Sections Graphs Doc