Perturbation of eigenvalues in U(n) by pseudo-reflections

  title={Perturbation of eigenvalues in U(n) by pseudo-reflections},
  author={Dragomir Z. Djokovi{\'c} and Jerry Malzan},
A unitary pseudo-reflection is a matrix where a is a unit vector in Cn . If is a unitary matrix we study the variation of eigenvalues of ARθ when θ increases from 0 to 2π. Some of these eigenvalues may remain fixed while the others move monotonicaliy and counter-clockwise along the unit circle. As a byproduct, we obtain an explicit formula for the determinant of the matrix whose (i,j)th entry is .