Core Concepts
The minimum distance of evaluation codes associated to finite sets of points in projective space can be bounded below using the initial degree and minimum socle degree of the defining ideal of the point set.
Abstract
The article investigates the minimum distance of evaluation codes associated to finite sets of points in projective space over an arbitrary field K. The key findings are:
For any finite set of points X in Pk-1, k ≥ 3, and any integer 1 ≤ a ≤ α(X) - 1, where α(X) is the initial degree of the defining ideal of X, the minimum distance d(X)a satisfies:
d(X)a ≥ (k-1)(α(X) - 1 - a) + 1
This bound improves and generalizes previous results.
For any finite set of points X in Pk-1, k ≥ 3, in general linear position, and any integer 1 ≤ a ≤ s(X) - 1, where s(X) is the minimum socle degree, the minimum distance d(X)a satisfies either:
d(X)a ≤ k - 1
or
d(X)a ≥ (k-1)(s(X) - 1 - a) + 2
This result generalizes a previous bound obtained for complete intersection point sets in general linear position.
The proofs rely on understanding the geometry of the point sets, in particular the fact that n points in Pk-1 can be placed on ⌈n/(k-1)⌉ hyperplanes. The authors also discuss the relationship between the minimum distance, initial degree, and minimum socle degree, highlighting the importance of these homological invariants in the study of evaluation codes.