Engineering topics
Publications and source records attributed to Lowdin, P.-O..
Quantum mechanical perturbation theory calculation of upper and lower bounds of energy eigenvalues using partitioning methods
Time dependent phenomena in nonrelativistic quantum theory treated by evolution operator technique
Fundamental quantum theory formulations using axioms of linear algebra
Upper and lower bounds determined for energy eigenvalues using Hamiltonian operators and projections on manifolds in Hilbert regions
Low bounds to energy eigenvalues in quantum theory problems by partitioning technique for positive perturbation