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We show a somewhat surprising result: if is a disk in the plane , then there is a homeomorphism such that, for every , the orbit is bounded, but for every , the orbit is doubly divergent. To prove this, we define a class of homeomorphisms on the square , called normally rising homeomorphisms, and show that a normally rising homeomorphism can have very complex -limit sets and -limt sets, though the homeomorphism itself looks very simple.

生成讲解博客的中文版本

生成AI智能校验的中文版本