Semi-symmetric four dimensional neutral Lie groups

Abstract

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Four-dimensional homogeneous semi-symmetric Lorentzian manifolds

“…In [7], A. Haji-Badali and A. Zaeim give a complet classification of fourdimensional semi-symmetric nonsymmetric neutral Lie algebras.…”

“…Recently, the author with M. Boucetta and A. Ikemakhen give a complet classification of four-dimensional homogeneous semi-symmetric Lorentzian manifolds [1]. More recently, A. Haji-Badali and A. Zaeim give a complet classification of four-dimensional semi-symmetric neutral Lie groups [7].…”

On the semi-symmetric Lorentzian spaces

“…De Leo have studied the semi-symmetric Lorentzian three-manifolds admitting a parallel degenerate line field (See [10]). In [11], A. Haji-Badali and A. Zaeim gave a complete classification of Semi-symmetric four dimensional neutral Lie groups.…”