A sum formula for the Casson-Walker invariant
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- Lescop, C. Invent math (1998) 133: 613. doi:10.1007/s002220050256
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in terms of the form induced on ∧3 L A by the algebraic intersection on H2(A∪Σ−A′) paired to the analogous form on ∧3 L B via the intersection form of Σ. The simple formula that we obtain naturally extends to the extension of the Casson-Walker invariant of the author. It also extends to gluings along non-connected surfaces.