How to construct ideal points of SL2(C) representation spaces of knot groups

An ideal point is a limit of conjugacy classes of representations of the fundamental group Γ of a 3-manifold into SL2(C). Culler and Shalen (1983) studied ideal points by using trees. In this paper we give a method to construct ideal points by making the trees concretely for knot groups Γ. We explain the method by illustrating it for simple three knots.