The self-consistent procedure in electronic structure calculations is revisited using a highly efficient and robust algorithm for solving the non-linear eigenvector problem, i.e., H({ψ})ψ = Eψ. This new scheme is derived from a generalization of the FEAST eigenvalue algorithm to account for the non-linearity of the Hamiltonian with the occupied eigenvectors. Using a series of numerical examples...

Protozoa that parasitize the human intestine include Entamoeba histolytica, Blastocystis hominis, Trichomonas hominis, Cryptosporidium parvum, Giardia lamblia, Balantidium coli, Isospora, and other protozoa. Most intestinal protozoan infections can cause acute or chronic diarrhea in healthy individuals and may result in intractable, life-threatening illness in patients in immunosuppressive stat...