is mentioned by

Thm* c:Collection(T), f:(TCollection(T')), y:T'. y (xc.f(x)) (x:T. x c & y f(x))	[member_col_accum]
Thm* c:Collection(T), f:(TT'), x:T'. x < f(y) | y c > (y:T. y c & x = f(y))	[member_col_map]
Thm* C:(ICollection(T)), x:T. x i:I. C(i) (i:I. x C(i))	[member_col_union]
Def (xc.f(x))(y) == x:T. x c & y f(x)	[col_accum]
Def < f(x) | x c > (y) == x:T. x c & y = f(x) T'	[col_map]
Def (i:I. C(i))(x) == i:I. x C(i)	[col_union]

In prior sections: core fun 1 int 2

Try larger context: GenAutomata