9 citations · 19 across the 13 of their papers we have counts for
4 papers · 1 filter
A new kind of uniqueness theorems for inverse Sturm-Liouville problems
Yuri Ashrafyan
We prove Marchenko-type uniqueness theorems for inverse Sturm-Liouville problems. Moreover, we prove a generalization of Ambarzumyans theorem.
On a property of norming constants of Sturm-Liouville problem
Yuri Ashrafyan, Tigran Harutunyan
A connection, which shows the dependence of norming constants on boundary conditions, was found using the Gelfand-Levitan method for the solution of inverse Sturm-Liouville problem…
Gradient of eigenvalues of Dirac operators and its applications
Tigran Harutyunyan, Yuri Ashrafyan
For Dirac operators, which have discrete spectra, the concept of eigenvalues gradient is given and formulae for this gradients are obtained in terms of normalized eigenfunctions. I…
Isospectral Dirac operators
Yuri Ashrafyan, Tigran Harutyunyan
We give the description of self-adjoint regular Dirac operators, on , with the same spectra.