Nondifferentiabie points of ∂ W c ( A )
Natália Bebiano · Linear and Multilinear Algebra · 1986
Let A be an n × n complex matrixc = (γ1, … γn)τ ε Cn and Λn the set of all n-tuples of orthonormal vectors in Cn. Let ∂W c(A) denote the boundary of the set In this note certain kinds of nondifferentiable points of ∂W c(A) are investigated.