Pointwise multiple averages for sublinear functions

Sebastián Donoso, Andreas Koutsogiannis, Wenbo Sun

For any measure preserving system $(X,\mathcal{B},\mu ,T_1,\dots ,T_d),$ where we assume no commutativity on the transformations $T_i,$ $1\le i\le d,$ we study the pointwise converg…