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Eugene S Kryachko
Permutational Symmetry Properties
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2-matrices 5-matrix asymptotic atomic action atomic properties atomic virial theorem average Bader Bingel bond calculation charge density charge distribution Chem closed channels coefficients consider coordinates corresponding coupling defined by Eq definition density matrix determined diagonal doubly occupied orbitals eigenfunctions eigenvalues electron entries equation expression Feshbach force law given Hamiltonian idempotents interaction irrep kets kinetic energy Kryachko Kutzelnigg Lagrangian level operator Lowdin matrix elements McWeeny molecular system molecule natural spin obtain open system orthogonal orthonormal permutation Phys principle of stationary problem Quantum Chem Quantum Chemistry quantum mechanical quantum topology region representation Rettrup Sarma Section side of Eq Siegert single-particle spanning the irrep spin-free Srebrenik stationary action subsystem symmetric group tableau tensor basis theory tion topological total system transformation unitary variational principle vector virial theorem wave functions wave packet Young schemes Young tableau zero-flux surface