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• #### Generalized Casson Invariants for SO(3),U(2),Spin(4) , and SO(4) ﻿

(American Mathematical Society, 1994)
We investigate Casson-type invariants corresponding to the low-rank groups $\mathrm{SO}(3), \mathrm{SU}(2) \times S^1, \mathrm{U}(2), \operatorname{Spin}(4)$ and SO(4). The invariants are defined following an approach ...