Nielsen coincidence, fixed point and root theories of \(n\)-valued maps
In this work the authors define the Nielsen coincidence number \(N(\phi:\psi)\) of \((m,n)\)-valued pairs of maps of the circle and they calculate this number for all such pairs and they show that it equals the minimum coincidence number \(MC(\phi:\psi)\).
scientific article; zbMATH DE number 6379662
scientific article