Ab initio electronic structure methods Algebra Algebraic diagrammatic constructions Calculations Cluster computing Computation theory Computational spectroscopy Computer software Correlated wave functions Electronic structure Electronic structure theory Greedy strategies Ground state Hamiltonians High level languages High-performance computing clusters Hilbert spaces Model-based OPC Molecular properties Numerical methods Object oriented programming Object-oriented program Parameter spaces Perturbation techniques Phase diagrams Quantum chemistry Quantum models Quantum spin systems Reduced basis methods Reduced order modelling