Explicit deformation of a spider algebra to a curvilinear scheme via Möbius generators

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Authors: David Turturean
Cited by: 0
References: 4

Abstract

We construct an explicit flat one-parameter family of 22-dimensional Artinian $k$-algebras whose special fibre is the spider algebra $k[x,y,z]/(x^8, y^8, z^8, xy, xz, yz)$ and whose generic fibre is the curvilinear algebra $k[t]/(t^{22})$. The construction uses Möbius generators $u_a = t/(1-at)$ inside the curvilinear ring together with a divided-difference change of coordinates, and produces the family via a weighted Rees degeneration with integer coefficients. This gives an explicit one-parameter family witnessing, for this spider ideal, the general phenomenon proved by Bérczi-Svendsen that every monomial subscheme of $\mathbb{C}^d$ lies in the curvilinear component of the Hilbert scheme of points.

Fields of Study & Subjects

Commutative Algebra and Its Applications Algebraic Geometry and Number Theory Polynomial and algebraic computation

Publication details

Journal / source
arXiv (Cornell University)
Publication date
1 March 2026
Language
EN
Document type
Preprint