Bull. Korean Math. Soc. 2006 Vol. 43, No. 4, 841-846 Printed December 1, 2006
Changsik Jeoung and Yongkuk Kim Kyungpook National University, Kyungpook National University
Abstract : 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 $\chi(F) \not= 0 \not= \chi(A)$, then $F \times A$ is a codimension-$(t+1)$ PL fibrator.