ISSN : 1226-0657
We study the geometry of half light like submanifold M of a semi-Riemannian space form <TEX>$\bar{M}$</TEX>(c) subject to the conditions : (a) the screen distribution on M is totally umbilic in M and the coscreen distribution on M is conformal Killing on <TEX>$\bar{M}$</TEX> or (b) the screen distribution is totally geodesic in M and M is irrotational.
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