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This eloquently written paper presents further investigation of the problem when a given PL map is an approximate fibration. Let \(M\) be a connected, orientable, PL \((n + k)\)-manifold, \(B\) a polyhedron. A PL map \(p : M \to B\) is said to be \(N\)-like, where \(N\) is a fixed orientable \(n\)-manifold, if each \(p^{-1} b\) collapses to an \(n\)-complex homotopy equivalent to \(N\). \(N\) is called a codimension \(k\) PL fibrator, if for every orientable \((n + k)\)-manifold \(M\) and \(N\)-like \(p : M \to B\), \(p\) is an approximate fibration. \(N\) is a PL fibrator if it has this property for all \(k > 0\). E.g. previous results say that 2-manifolds, all but the 2-sphere and the torus are PL fibrators, and that also \((k - 1)\)-connected manifolds \((k > 1)\) are codimension \(k\) fibrators. The main result is that the complex projective \(n\)-space \(\mathbb{C} P^n\) is a codimension \(2n + 2\) PL fibrator. Concerning the proof one should point out that it employs quite a lot of algebraically topological arguments and in part depends on some previous results of the same author.
Approximations in PL-topology, Complex projective space, hopfian manifold, Hopfian manifold, Approximate fibration, Cohomology ring, Algebraic topology of manifolds, approximate fibration, complex projective space, hopfian group, Fibrator, Hopfian group, fibrator, cohomology cup product, Geometry and Topology, Cohomology cup product
Approximations in PL-topology, Complex projective space, hopfian manifold, Hopfian manifold, Approximate fibration, Cohomology ring, Algebraic topology of manifolds, approximate fibration, complex projective space, hopfian group, Fibrator, Hopfian group, fibrator, cohomology cup product, Geometry and Topology, Cohomology cup product
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