For oblique disc impacts, tangential and kinetic restitution coefficients are non-unique functions of impact angle, friction, and initial angular velocity, even when normal restitution is well defined.
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Non-uniqueness of restitution coefficients in oblique impacts of discs, even in cases of unique normal restitution
For oblique disc impacts, tangential and kinetic restitution coefficients are non-unique functions of impact angle, friction, and initial angular velocity, even when normal restitution is well defined.