Multiplicity of continuous maps between manifolds

Details Multiplicity of continuous maps between manifolds Multiplicity of continuous maps between manifolds

2010-02-03

arxiv.org/abs/1002.0660v2

Mathematics

Algebraic Topology

Scientific paper

We consider a continuous map $f :M\to N$ between two manifolds and try to estimate its multiplicity from below, i.e. find a $q$-tuple of pairwise distinct points $x_1,..., x_q\in M$ such that $f(x_1) = f(x_2) = ... = f(x_q)$. We show that there are certain characteristic classes of vector bundle $f^*TN-TM$ that guarantee a bound on the multiplicity of $f$. In particular, we prove some non-trivial bound on the multiplicity for a continuous map of a real projective space of certain dimension into a Euclidean space.

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