PL fibrators among products of hopfian manifolds

摘要

Suppose that $F$ is a closed $t$-aspherical PL $n$-manifold with finite, sparsely abelian $pi_1(F)$ and $A$ is a closed aspherical PL $m$-manifold with hopfian, normally cohopfian $pi_1(A)$. If $chi(F) ot= 0 ot= chi(A)$, then $F imes A$ is a codimension-$(t+1)$ PL fibrator.