A note on an invariant of Fintushel and Stern

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Fintushel and Stern have used equivariant Yang-Mills theory to define an invariant for Seifert- fibered homology spheres which, if positive, shows that the homology sphere cannot bound a Z 2-acyclic 4-manifold. This invariant was used to show that certain knots were not slice. Combining their idea and a compactness result of Fintushel and Lawson, we generalize their invariant to Seifert-fibered rational homology spheres and apply it to Montesinos knots. In particular we obtain a gauge theoretic proof of a non-slice theorem of Casson and Gordon.