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Abstract: The author considers autonomous neutral or retarded matrix delay differential systems. The imaginary axis eigenvalues of such a system are shown to be contained in the set of generalized ...

In this project, we created a simple c++ library to calculate eigenvalues and eigenvectors. The library is build with a CMakeLists.txt created in CLion and uses googletests for the testing. A ...

In this paper, we investigate negative eigenvalues of exactly solvable quantum models, particularly one-dimensional Hamiltonians with δ′-like potentials used to represent localized dipoles. These ...

We consider a class of one-dimensional nonhermitian oscillators and discuss the relationship between the real eigenvalues of PT-symmetric oscillators and the resonances obtained by different authors.

Abstract: This letter derives an explicit formula for the evaluation of an arbitrary analytical function of a companion matrix with distinct eigenvalues. The derivation presented here is simple and ...