• openAccess   Valence bond approach and Verma bases 

      Paldus, Josef; Planelles, Josep Springer (2018-02)
      The unitary group approach (UGA) to the many-fermion problem is based on the Gel’fand–Tsetlin (G–T) representation theory of the unitary or general linear groups. It exploits the group chain U(n)⊃U(n−1)⊃⋯⊃U(2)⊃U(1) and ...