A note on the Cohen-Macaulay type of lines in uniform position in 𝐴ⁿ⁺¹

Author:

Brown William C.

Abstract

Let L 1 , , L s {\mathfrak {L}_1}, \ldots ,{\mathfrak {L}_s} be s s -distinct lines in A k n + 1 {\mathbf {A}}_k^{n + 1} passing through the origin. Assume s = ( n n + d ) λ s = (_n^{n + d}) - \lambda where n n , d 2 d \geqslant 2 . If L 1 , , L s {\mathfrak {L}_1}, \ldots ,{\mathfrak {L}_s} are in generic s s -position, and λ = 0 \lambda = 0 . 1 , , n 1 1, \ldots ,n - 1 , then the Cohen-Macaulay type, t ( L 1 , , L s ) t({\mathfrak {L}_1}, \ldots ,{\mathfrak {L}_s}) , of L 1 , , L s {\mathfrak {L}_1}, \ldots ,{\mathfrak {L}_s} is given by the following formula: t ( L 1 , , L s ) = ( n 1 n + d 1 ) λ t({\mathfrak {L}_1}, \ldots ,{\mathfrak {L}_s}) = (_{n - 1}^{n + d - 1}) - \lambda . This formula is known to be false for λ = n \lambda = n . In this paper, we show that if L 1 , , L s {\mathfrak {L}_1}, \ldots ,{\mathfrak {L}_s} are in uniform position, and λ = n \lambda = n . then t ( L 1 , , L s ) = ( n 1 n + d 1 ) n t({\mathfrak {L}_1}, \ldots ,{\mathfrak {L}_s}) = (_{\;n - 1}^{n + d - 1}) - n .

Publisher

American Mathematical Society (AMS)

Subject

Applied Mathematics,General Mathematics

Reference5 articles.

1. A matrix computation for the Cohen-Macaulay type of 𝑠-lines in affine (𝑛+1)-space;Baruch, Marjory;J. Algebra,1983

2. On the Cohen-Macaulay type of 𝑠 lines in 𝐴ⁿ⁺¹;Geramita, A. V.;J. Algebra,1981

3. Minimally generating ideals defining certain tangent cones;Geramita, A. V.;J. Algebra,1982

4. The ideal of forms vanishing at a finite set of points in 𝑃ⁿ;Geramita, A. V.;C. R. Math. Rep. Acad. Sci. Canada,1982

5. A conjecture on Cohen-Macaulay type;Roberts, Leslie G.;C. R. Math. Rep. Acad. Sci. Canada,1981

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