Bear: A tool for studying Bers slices of punctured tori by David Dumas Bear is a tool for calculating and testing discreteness of holonomy representations of complex projective structures on punctured tori. It can be used to draw pictures of Bers slices and explore the geometry of quasifuchsian space in the SL_2(C) representation variety. It also has powerful scripting features that make it easy to create complex animations or to automate larger calculations. (Source: