By Selman Akbulut
Within the spring of 1985, A. Casson introduced a fascinating invariant of homology 3-spheres through structures on illustration areas. This invariant generalizes the Rohlin invariant and provides extraordinary corollaries in low-dimensional topology. within the fall of that very same yr, Selman Akbulut and John McCarthy held a seminar in this invariant. those notes grew out of that seminar. The authors have attempted to stay with reference to Casson's unique define and continue via giving wanted info, together with an exposition of Newstead's effects. they've got frequently selected classical concrete methods over basic equipment. for instance, they didn't try to provide gauge concept motives for the result of Newstead; as an alternative they his unique ideas.
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