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Öğe ( α,β )- TYPE ALMOST η-RICCI-YAMABE SOLITONS IN PERFECT FLUID SPACETIME(Comenius Univ, Sch Medicine, 2024) Pandey, S.; Mert, T.; Atceken, M.In this paper, we consider perfect fluid spacetime admitting (alpha, beta)type almost eta-Ricci-Yamabe solitons by means of some curvature tensors. Ricci pseudosymmetry concepts of perfect fluid spacetime admitting (alpha, beta)-type almost eta-Ricci-Yamabe soliton are introduced according to the choice of some special curvature tensors such as Riemann, concircular and projective curvature tensor. After then, according to choosing of the curvature tensors, necessary conditions are given for perfect fluid spacetime admitting (alpha, beta)-type almost eta-Ricci-Yamabe soliton to be Ricci semisymmetric. Then, some important characterizations are given for Ricci, Yamabe, Einstein and eta-Einstein solitons on perfect fluid spacetime.
