(<=> (Listterm ?Expr)
(And (Term ?Expr) (List ?Expr) (= (First ?Expr) (Quote Listof))))
(= (First ?Expr) (Quote Listof)) (List ?Expr) (Term ?Expr)
(Exhaustive-Subclass-Partition Term
(Setof Variable
Constant
Listterm
Setterm
Quoterm
Logterm
Quanterm))
(<=> (Listterm ?Expr)
(And (Term ?Expr) (List ?Expr) (= (First ?Expr) (Quote Listof))))