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wigner eckart theorem
Dietrich Eckart
(23 March 1868 – 26 December 1923) a German völkisch poet, playwright, journalist, publicist, and political activist who was one of the founders of the German Workers' Party, the precursor of the Nazi Party.
Eckart conditions
The Eckart conditions, named after Carl Eckart, simplify the nuclear motion (rovibrational) Hamiltonian that arises in the second step of the Born–Oppenheimer approximation.
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