A fresh take on perturbation theory allows quantum-mechanical interactions to be simplified, while preserving low-energy properties, and deepens understanding of the complexity of quantum systems.
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Wolf, M. Divide, perturb and conquer. Nature Phys 4, 834–835 (2008). https://doi.org/10.1038/nphys1124
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DOI: https://doi.org/10.1038/nphys1124