Abstract
Let E⊂C be a nonempty closed connected subset of the circle |z|=1 such that 0 lies outside the convex hull conv E. Let S be the set of all n×n matrices with entries in conv(E∪{0}) such that all row and column sums belong to conv E. In this paper, we discuss the structure of the extreme points of S for different E and answer a question of Hadwin and Radjavi.
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