The present note reveals the role of the concept of greedy system of linear inequalities played in connection with lexicographically optimal solutions on convex polyhedra and discrete convexity. The lexicographically optimal solutions on convex polyhedra represented by a greedy system of linear inequalities can be obtained by a greedy procedure, a special form of which is the greedy algorithm of J. Edmonds for polymatroids. We also examine when the lexicographically optimal solutions become integral. By means of the Fourier–Motzkin elimination Murota and Tamura have recently shown the existence of integral points in a polyhedron arising as a subdifferential of an integer-valued, integrally convex function due to Favati and Tardella [Murota and Tamura, Integrality of subgradients and biconjugates of integrally convex functions. Preprint arXiv:1806.00992v1 (2018)], which can be explained by our present result. A characterization of integrally convex functions is also given.
Accepté le :
DOI : 10.1051/ro/2019001
Mots-clés : Greedy system, lexicographic optimality, discrete convexity, integrally convex functions
@article{RO_2019__53_5_1929_0,
author = {Fujishige, Satoru},
title = {Greedy systems of linear inequalities and lexicographically optimal solutions},
journal = {RAIRO - Operations Research - Recherche Op\'erationnelle},
pages = {1929--1935},
publisher = {EDP-Sciences},
volume = {53},
number = {5},
year = {2019},
doi = {10.1051/ro/2019001},
mrnumber = {4023844},
zbl = {1430.90398},
language = {en},
url = {http://www.numdam.org/articles/10.1051/ro/2019001/}
}
TY - JOUR AU - Fujishige, Satoru TI - Greedy systems of linear inequalities and lexicographically optimal solutions JO - RAIRO - Operations Research - Recherche Opérationnelle PY - 2019 SP - 1929 EP - 1935 VL - 53 IS - 5 PB - EDP-Sciences UR - http://www.numdam.org/articles/10.1051/ro/2019001/ DO - 10.1051/ro/2019001 LA - en ID - RO_2019__53_5_1929_0 ER -
%0 Journal Article %A Fujishige, Satoru %T Greedy systems of linear inequalities and lexicographically optimal solutions %J RAIRO - Operations Research - Recherche Opérationnelle %D 2019 %P 1929-1935 %V 53 %N 5 %I EDP-Sciences %U http://www.numdam.org/articles/10.1051/ro/2019001/ %R 10.1051/ro/2019001 %G en %F RO_2019__53_5_1929_0
Fujishige, Satoru. Greedy systems of linear inequalities and lexicographically optimal solutions. RAIRO - Operations Research - Recherche Opérationnelle, Tome 53 (2019) no. 5, pp. 1929-1935. doi : 10.1051/ro/2019001. http://www.numdam.org/articles/10.1051/ro/2019001/
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