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Bleher, Ott and Grebogi found numerically an interesting chaotic phenomenon in 1989 for the scattering of a particle in a plane from a potential field with several peaks of equal height. They claimed that when the energy E of the particle is slightly less than the peak height E c there is a hyperbolic suspension of a topological Markov chain from which chaotic scattering occurs, whereas for E > E c there are no bounded orbits. They called the bifurcation at E = E c an abrupt bifurcation todoi:10.1088/0951-7715/26/9/2703 fatcat:kcsazbdk2vf4tmwj2tubw77zcm