Cayley–Bacharach and evaluation codes on complete intersections

Abstract

Hansen (Appl. Algebra Eng. Comm. Comput. 14 (2003) 175) uses cohomological methods to find a lower bound for the minimum distance of an evaluation code determined by a reduced complete intersection in P 2 . In this paper, we generalize Hansen's results from P 2 to P m ; we also show that the hypotheses of Hansen (2003) may be weakened. The proof is succinct and follows by combining the Cayley–Bacharach Theorem and the bounds on evaluation codes obtained in Hansen (Zero-Dimensional Schemes (Ravello, 1992), de Gruyter, Berlin, 1994, pp. 205–211).