Download E-books Casson's Invariant for Oriented Homology Three-Spheres: An Exposition. (MN-36) (Mathematical Notes) PDF

By Selman Akbulut

Within the spring of 1985, A. Casson introduced a fascinating invariant of homology 3-spheres through buildings on illustration areas. This invariant generalizes the Rohlin invariant and offers stunning corollaries in low-dimensional topology. within the fall of that very same 12 months, Selman Akbulut and John McCarthy held a seminar in this invariant. those notes grew out of that seminar. The authors have attempted to stay just about Casson's unique define and continue through giving wanted info, together with an exposition of Newstead's effects. they've got usually selected classical concrete techniques over normal tools. for instance, they didn't try and supply gauge idea causes for the result of Newstead; as an alternative they his unique recommendations.

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