Method for locating errors in Hamiltonian matrices
Geerd H. F. Diercksen, Włodzisław Duch, Jacek Karwowski · Physical Review A · 1990
A method for locating errors in matrices representing Hermitian operators in Hilbert spaces is discussed. The method is based on invariance properties of the first two moments of the spectral density distribution of these operators with respect to unitary transformations of the basis. In particular, applications to eigenvalue problems of the N-electron Hamiltonians in finite-dimensional spin-adapted Hilbert spaces are studied in detail.