منابع مشابه
Peter D. Williamson, MD (1936-2008)
Peter D. Williamson died in his home in Lyme, New Hampshire on June 4th, 2008 after a courageous year-long battle with lung cancer. With his passing the neurology community lost a compassionate advocate, clinician, researcher and fundraiser in the field of epilepsy and epilepsy surgery. He is survived by his wife Susan, their four children, and six grandchildren. Peter D. Williamson was born in...
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Let N be the class of closed simply connected, smooth n–manifolds that admit nonnegative sectional curvature and let P be the corresponding class for positive curvature. Known examples suggest that N ought to be much larger than P . On the other hand, there is no known obstruction that distinguishes between the two classes. So its actually possible that N = P . In [PetWilh2] we will give a defo...
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Prior to this major breakthrough, there were many partial results. Starting with Gromoll and Shikata ([Grom] and [Shik]) and more recently Suyama ([Suy]) it was shown that if one allows for a stronger pinching hypothesis δ ≤ sec ≤ 1 for some δ close to 1, then, in the simply connected case, the manifold is diffeomorphic to a sphere. In the opposite direction, Weiss showed that not all exotic sp...
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ژورنال
عنوان ژورنال: Journal of Neuropathology & Experimental Neurology
سال: 1987
ISSN: 0022-3069,1554-6578
DOI: 10.1097/00005072-198701000-00010