Defect basis property of the eigenvectors of a selfadjoint operator- valued function and formula for defect
The author studies the possible changes of dimension of the positive part of a continuous selfadjoint operator-valued function, when its variable transverses through some Fredholm eigenvalue. Some results about the defect basis property are also obtained and the formula for the defect is proved.
changes of dimension of the positive part of a continuous selfadjoint operator-valued function
scientific article; zbMATH DE number 222161