At:
member st app
c1,c2:Collection(SimpleType), s:SimpleType. s st_app(c1;c2) (a:SimpleType. a c2 & as c1)
By:
Unfold `st_app` 0
THEN
RW ColMemberC 0
THEN
RWW "member_st_app1" 0
THEN
RWW "assert_st_eq" 0
THEN
ExRepD
THEN
Repeat (AutoInstConcl [])
THEN
AllHyps (i.AllHyps (j.(HypSubst i j) THEN Trivial))
Generated subgoals: