Exponential separation in 4{manifolds
نویسنده
چکیده
We use a new geometric construction, grope splitting, to give a sharp bound for separation of surfaces in 4{manifolds. We also describe applications of this technique in link-homotopy theory, and to the problem of locating 1{null surfaces in 4{manifolds. In our applications to link-homotopy, grope splitting serves as a geometric substitute for the Milnor group. AMS Classi cation numbers Primary: 57N13 Secondary: 57M25, 57N35, 57N70
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تاریخ انتشار 2000