Ju l 1 99 8 Projective generalizations of Lelieuvre ’ s formula
نویسنده
چکیده
Generalizations of the classical affine Lelieuvre formula to surfaces in projective three-dimensional space and to hypersurfaces in multidimensional projective space are given. A discrete version of the projective Lelieuvre formula is presented too. Mathematics Subject Classifications (1991): 51A30, 14CO5
منابع مشابه
On two generalizations of semi-projective modules: SGQ-projective and $pi$-semi-projective
Let $R$ be a ring and $M$ a right $R$-module with $S=End_R(M)$. A module $M$ is called semi-projective if for any epimorphism $f:Mrightarrow N$, where $N$ is a submodule of $M$, and for any homomorphism $g: Mrightarrow N$, there exists $h:Mrightarrow M$ such that $fh=g$. In this paper, we study SGQ-projective and $pi$-semi-projective modules as two generalizations of semi-projective modules. A ...
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تاریخ انتشار 2008