were established.

In 1928, Ivanenko and Landau developed the theory of fermions as skew-symmetric tensors. This theory, known as the Ivanenko-Landau-Kahler theory, is not equivalent to Dirac's one in the presence of a gravitation field, and only it describes fermions on a lattice.

In 1929, Ivanenko and Fock described the parallel displacement of spinors in curved space-time (the famous Ivanenko-Fock coefficients). Nobel

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