%0 Journal Article %T Twisted conjugacy classes for polyfree groups %A Alexander Fel'shtyn %A Daciberg Gon£żalves %A Peter Wong %J Mathematics %D 2008 %I arXiv %X Let $G$ be a finitely generated polyfree group. If $G$ has nonzero Euler characteristic then we show that $Aut(G)$ has a finite index subgroup in which every automorphism has infinite Reidemeister number. For certain $G$ of length 2, we show that the number of Reidemeister classes of every automorphism is infinite. %U http://arxiv.org/abs/0802.2937v3