Rotation invariant ultradistributions
  We prove that an ultradistribution is rotation invariant if and only if it coincides with its spherical mean. For it, we study the problem of spherical representations of ultradistributions on $\mathbb{R}^{n}$. Our results apply to both the quasianalytic and the non-quasianalytic case. 
{\DJ}or{\dj}e Vu\v{c}kovi\'c and Jasson Vindas
math.FA