Topological properties of operator generalized effect algebrasLorentzian manifolds having the killing propertyGeneral formula for symmetry factors of Feynman diagramsOn the spectrum of the Schrodinger Hamiltonian of the one-dimensional harmonic oscillator perturbed by two identical attractive point interactionsThe logic order on a generalized Hermitian algebraThe truncation and renormalizability of the superstring and heterotic string effective actionsNecessary conditions for optimality of decomposable entanglement witnesses
