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## Two constructions of weight system for invariants of knots in non-trivial 3-manifolds

Topology and its Applications. 2008. Vol. 150. No. 16. P. 1757-1765.

A new family of weight systems of finite type knot invariants of any positive degree in orientable 3-manifolds with non-trivial first homology group is constructed. The principal part of the Casson invariant of knots in such manifolds is split into the sum of infinitely many independent weight systems. Examples of knots separated by corresponding invariants and not separated by any other known finite type invariants are presented.