کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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4585447 | 1630542 | 2012 | 11 صفحه PDF | دانلود رایگان |
In this paper, we are interested in the generic initial ideals of singular projective curves with respect to the graded lexicographic order. Let C be a singular irreducible projective curve of degree d⩾5d⩾5 with the arithmetic genus ρa(C)ρa(C) in PrPr where r⩾3r⩾3. If M(IC)M(IC) is the regularity of the lexicographic generic initial ideal of ICIC in a polynomial ring k[x0,…,xr]k[x0,…,xr] then we prove that M(IC)M(IC) is 1+(d−12)−ρa(C) which is obtained from the monomialxr−3xr−1(d−12)−ρa(C), provided that dimTanp(C)=2 for every singular point p∈Cp∈C. This number is equal to one plus the number of secant lines through the center of general projection into P2P2. Our result generalizes the work of J. Ahn (2008) [1] for smooth projective curves and that of A. Conca and J. Sidman (2005) [9] for smooth complete intersection curves in P3P3. The case of singular curves was motivated by A. Conca and J. Sidman (2005) [9, Example 4.3]. We also provide some illuminating examples of our results via calculations done with Macaulay 2 and Singular (Decker et al., 2011 [10], Grayson and Stillman [16]).
Journal: Journal of Algebra - Volume 372, 15 December 2012, Pages 584–594