Canadian Journal of Mathematics · 1956 · 24 citations · 2 references
Spectral TheoryExtremal PropertiesLinear OperatorEngineeringK ≤ NHermitian MatrixX KMatrix TheoryFunctional AnalysisMatrix AnalysisRandom Matrix
In (1) Fan showed that if A is a Hermitian matrix with eigenvalues λ 1 ≤ … ≤ λ n then, for k ≤ n, , , where X 1 , … , x k run over all sets of k orthonormal (o.n.) vectors in unitary n -space V.
2