
Summary: We describe some conditions under which the product of two groups with certain property is a group with the same property, and we describe some conditions under which the product of hopfian manifolds is another hopfian manifold. As applications, we find some PL fibrators among the product of fibrators.
degree of a map, Hopfian manifold, Topology of the Euclidean \(n\)-space, \(n\)-manifolds (\(4 \leq n \leq \infty\)), codimension-\(k\) PL fibrator, normally cohopfian, Generalizations of fiber spaces and bundles in algebraic topology, Quotient spaces, decompositions in general topology, sparsely abelian, Shapes (aspects of topological manifolds), approximate fibration
degree of a map, Hopfian manifold, Topology of the Euclidean \(n\)-space, \(n\)-manifolds (\(4 \leq n \leq \infty\)), codimension-\(k\) PL fibrator, normally cohopfian, Generalizations of fiber spaces and bundles in algebraic topology, Quotient spaces, decompositions in general topology, sparsely abelian, Shapes (aspects of topological manifolds), approximate fibration
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