A corrected Nielsen coincidence invariant N(f:g) for (n,m)-valued map pairs is constructed from graph intersections and shown to be sharp for maps on the circle.
C.Axioms for the fixed point index of n-valued maps, and some applications.Journal of Fixed Point Theory and Applications 20 (2018)
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Nielsen coincidence theory of $(n,m)$-valued pairs of maps
A corrected Nielsen coincidence invariant N(f:g) for (n,m)-valued map pairs is constructed from graph intersections and shown to be sharp for maps on the circle.