Abstract

In recent years, certain analytic proposals have been appealed to that are incompatible with fundamental principles of structure−building that appear attractive. One such principle is Extension (Chomsky,1995), which ensures that what counts as the top of the tree at a given point in a derivation restricts the class of possible operations that can apply at that point. Another principle I will show to be desirable is Insularity, which bans on interarboreal movement.