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 Two characterization theorems for irrotational lightlike geometry Commun. Korean Math. Soc. 2013 Vol. 28, No. 4, 809-818 https://doi.org/10.4134/CKMS.2013.28.4.809Printed October 1, 2013 Dae Ho Jin Dongguk University Abstract : We study irrotational half lightlike submanifolds $M$ of a semi-Riemannian space form with a semi-symmetric non-metric connection such that its structure vector field is tangent to $M$. We prove two characterization theorems for such an irrotational half lightlike submanifold. Keywords : screen quasi-conformal, half lightlike submanifold, semi-sym\-metric non-metric connection Downloads: Full-text PDF