1. The problem statement, all variables and given/known data Prove that in the homogeneous deformation, particles which after the deformation lie on the surface of a shere of radius b originally lay on the surface of an ellipsoid. 2. Relevant equations homogeneous deformations are motions of the form: xi=ci + AiRXR where ci and AiR are constants or functions of time. 3. The attempt at a solution I don't know how to prove this, i think i first need to know the equation of motion of a sphere then relate this to the equation above. Im confused about this.