Analytical regularizing effect for the radial and spatially homogeneous   Boltzmann equation
  In this paper, we consider a class of spatially homogeneous Boltzmann equation without angular cutoff. We prove that any radial symmetric weak solution of the Cauchy problem become analytic for positive time. 
L\'eo Glangetas (LMRS), Mohamed Najeme (LMRS)
math.AP