Browsing by Author "Hounnonkpe, R."
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Item Differential Geometry and its Applications(Elsevier, 2019) Atindogbe, C.; Gutiérrez, M.; Hounnonkpe, R.In the present paper various necessary and/or sufficient conditions in terms of the existence and properties of quasi-time functions, semi-time functions and generalized time functions are provided to get different levels of the causal ladder in spacetimes. We also show several links between curvature conditions and causality.