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Crawford numbers of companion matrices

Hwa-Long Gau, Kuo-Zhong Wang, Pei Yuan Wu
2016 Operators and Matrices  
The (generalized) Crawford number C(A) of an n -byn complex matrix A is, by definition, the distance from the origin to the boundary of the numerical range W (A) of A . If A is a companion matrix ⎡
doi:10.7153/oam-10-49 fatcat:4c6m3cwhwbai3grvjrowsyogke