On k-regular maps

On k-regular maps

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Pavle Blagojevic , Freie Universität, Berlin
Fine Hall 214

The question about the existence of a continuous k-regular map from a topological space X to an N-dimensional Euclidean space R^N, which would map any k distinct points in X to linearly independent vectors in R^N, was first considered by Borsuk in 1957. In this talk we present a proof of the following theorem, which extends results by Cohen--Handel 1978 (for d=2) and Chisholm 1979 (for d power of 2): For integers k and d greater then zero, there is no k-regular map R^d -> R^N for N < d(k-a(k))+a(k),  where a(k) is the number of ones in the dyadic expansion of k. Joint work with G. M. Ziegler and W. Lück.