Highmann's Theorem on Discrete Sets

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Abstract

In this paper we investigate properties of different classes of discrete sets with respect to the partial-order of subpicture. In particular we take in consideration the classes of convex polyominoes and L-convex polyominoes. In the first part of the paper we study closure properties of these classes with respect the order and we give a new characterization of L-convex polyominoes. In the second part we pose the question to extend Higman’s theoremto discrete sets. We give a negative answer in the general case and we prove that the set of L-convex polyominoes is well-partially-ordered by using a representation of L-convex polyominoes in terms of words of a regular language.
Lingua originale Italian 435-446 12 Fundamenta Informaticae 74(4) Published - 2006

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In: Fundamenta Informaticae, Vol. 74(4), 2006, pag. 435-446.

Risultato della ricerca: Article

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abstract = "In this paper we investigate properties of different classes of discrete sets with respect to the partial-order of subpicture. In particular we take in consideration the classes of convex polyominoes and L-convex polyominoes. In the first part of the paper we study closure properties of these classes with respect the order and we give a new characterization of L-convex polyominoes. In the second part we pose the question to extend Higman’s theoremto discrete sets. We give a negative answer in the general case and we prove that the set of L-convex polyominoes is well-partially-ordered by using a representation of L-convex polyominoes in terms of words of a regular language.",
keywords = "Discrete sets, polyominoes and L-convex polyominoes; subpicture order and wellpartial-ordering.",
author = "Antonio Restivo and Fabio Burderi and Giuseppa Castiglione",
year = "2006",
language = "Italian",
volume = "74(4)",
pages = "435--446",
journal = "Fundamenta Informaticae",
issn = "0169-2968",
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T1 - Highmann's Theorem on Discrete Sets

AU - Restivo, Antonio

AU - Burderi, Fabio

AU - Castiglione, Giuseppa

PY - 2006

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N2 - In this paper we investigate properties of different classes of discrete sets with respect to the partial-order of subpicture. In particular we take in consideration the classes of convex polyominoes and L-convex polyominoes. In the first part of the paper we study closure properties of these classes with respect the order and we give a new characterization of L-convex polyominoes. In the second part we pose the question to extend Higman’s theoremto discrete sets. We give a negative answer in the general case and we prove that the set of L-convex polyominoes is well-partially-ordered by using a representation of L-convex polyominoes in terms of words of a regular language.

AB - In this paper we investigate properties of different classes of discrete sets with respect to the partial-order of subpicture. In particular we take in consideration the classes of convex polyominoes and L-convex polyominoes. In the first part of the paper we study closure properties of these classes with respect the order and we give a new characterization of L-convex polyominoes. In the second part we pose the question to extend Higman’s theoremto discrete sets. We give a negative answer in the general case and we prove that the set of L-convex polyominoes is well-partially-ordered by using a representation of L-convex polyominoes in terms of words of a regular language.

KW - Discrete sets, polyominoes and L-convex polyominoes; subpicture order and wellpartial-ordering.

UR - http://hdl.handle.net/10447/40019

M3 - Article

VL - 74(4)

SP - 435

EP - 446

JO - Fundamenta Informaticae

JF - Fundamenta Informaticae

SN - 0169-2968

ER -