Paradoxical transitions to instabilities in hydromagnetic Couette-Taylor   flows
  By methods of modern spectral analysis, we rigorously find distributions of eigenvalues of linearized operators associated with an ideal hydromagnetic Couette-Taylor flow. Transition to instability in the limit of vanishing magnetic field has a discontinuous change compared to the Rayleigh stability criterion for hydrodynamical flows, which is known as the Velikhov-Chandrasekhar paradox. 
Oleg N. Kirillov, Dmitry E. Pelinovsky, Guido Schneider
physics.flu-dyn astro-ph.SR math-ph math.MP math.SP