Existence theorems of fold-maps

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  • ANDO Yoshifumi
    DEPARTMENT OF MATHEMATICS FACULTY OF SCIENCE YAMAGUCHI UNIVERSITY

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説明

Let N and P be smooth manifolds of dimensions n and p (n≥p≥2) respectively. A smooth map having only fold singularities is called a fold-map. We will study conditions for a continuous map f:N→P to be homotopic to a fold-map from the viewpoint of the homotopy principle. By certain homotopy principles for fold-maps, we prove that if there exists a fiberwise epimorphism TN_??_ θN→TP covering f, then there exists a fold-map homotopic to f, where θN is the trivial line bundle, We also give an additional condition for finding a fold-map which folds only on a finite number of spheres of dimension p-1.

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