| QTAIM | Quantum Theory of Atoms in Molecules |
| IQA | the Interacting Quantum Atoms approach |
| ETS | the Extended Transition State method |
| NOCV | the Natural Orbitals for Chemical Valence method |
| DLPNO | Domain-based Localized Pair-Natural Orbital |
| CCSD(T) | the coupled cluster (CC) single-double-triple method |
| LED | the Local Energy Decomposition scheme |
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