Abstract: The aim of this paper is to study the Weierstrass semigroup of ramified points on non-singular models for curves on a rational normal scroll. We find properties of this semigroup and determine it in some special cases, finding also a geometrical interpretation for some of the Weierstrass gaps.
Keywords: Weierstrass semigroup; ramified points; non-singular models for curves; scrolls
Classification (MSC2000): 14H55; 14H50
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