L. H. Thomas
Llewellyn Hilleth Thomas (21 October 1903 – 20 April 1992) was a British physicist and applied mathematician. He is best known for his contributions to atomic and molecular physics and solid-state physics. His key achievements include calculating relativistic effects on the spin-orbit interaction in a hydrogenic atom (Thomas precession), creating an approximate theory of
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-body quantum systems (Thomas-Fermi theory), and devising an efficient method for solving tridiagonal system of linear equations (Thomas algorithm).
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