Abstract
One of the oldest and richest problems from continuous location science is the famous Fermat–Torricelli problem, asking for the unique point in Euclidean space that has minimal distance sum to \(n\) given (non-collinear) points. Many natural and interesting generalizations of this problem were investigated, e.g., by extending it to non-Euclidean spaces and modifying the used distance functions, or by generalizing the configuration of participating geometric objects. In the present paper, we extend the Fermat–Torricelli problem in a twofold way: more general than for normed spaces, the unit balls of our spaces are compact convex sets having the origin as an interior point (but without symmetry condition), and the \(n\) given objects can be general convex sets (instead of points). We combine these two viewpoints, and the presented sequence of new theorems follows in a comparing sense that of corresponding theorems known for normed spaces. It turns out that some of these results holding for normed spaces carry over to our more general setting, and others do not. In addition, we present analogous results for related questions, like, e.g., for Heron’s problem. And finally, we derive a collection of additional results holding particularly for the Euclidean norm.
Similar content being viewed by others
References
Boltyanski, V., Martini, H., Soltan, V.: Geometric Methods and Optimization Problems. Kluwer Academic, Dordrecht (1999)
Durier, R., Michelot, C.: Geometrical properties of the Fermat–Weber problem. Eur. J. Oper. Res. 20, 332–343 (1985)
Martini, H., Swanepoel, K., Weiß, G.: The Fermat–Torricelli problem in normed planes and spaces. J. Optim. Theory Appl. 115, 283–314 (2002)
Martini, H., Schöbel, A.: Median and center hyperplanes in Minkowski spaces—a unified approach. Discret. Math. 241, 407–426 (2001)
Körner, M.-C., Martini, H., Schöbel, A.: Minsum hyperspheres in normed spaces. Discret. Appl. Math. 15, 2221–2233 (2012)
Mordukhovich, B.S., Nam, N.M.: An Easy Path to Convex Analysis and Applications. Morgan & Claypool, Williston, VT (2013)
Menger, K.: Untersuchungen über allgemeine Metrik. Math. Ann. 100, 75–163 (1928)
Boltyanski, V., Martini, H., Soltan, P.S.: Excursions into Combinatorial Geometry. Springer, Berlin (1997)
Plastria, F.: On destination optimality in asymmetric distance Fermat–Weber problems. Ann. Oper. Res. 40, 355–369 (1992)
Rockafellar, R.T.: Convex Analysis, 2nd edn. Princeton University Press, Princeton, NJ (1972)
Cobzaş, Ş.: Functional Analysis in Asymmetric Normed Spaces. Birkhäuser/Springer Basel AG, Basel (2013)
García-Raffi, L.M.: Compactness and finite dimension in asymmetric normed linear spaces. Topology Appl. 153, 844–853 (2005)
Werner, D.: Funktionalanalysis, 7th edn. Springer, Berlin (2011)
Bauschke, H.H., Combettes, P.L.: Convex Analysis and Monotone Operator Theory in Hilbert Spaces. Springer, New York (2011)
Kupitz, Y.S., Martini, H., Spirova, M.: The Fermat–Torricelli problem, part I: a discrete gradient-method approach. J. Optim. Theory Appl. 158, 305–327 (2013)
Martini, H., Swanepoel, K., Weiß, G.: The geometry of Minkowski spaces—a survey, Part I. Expo. Math. 19, 97–142 (2001)
Schneider, R.: Convex Bodies: The Brunn–Minkowski Theory. Cambridge University Press, Cambridge (1993)
Mordukhovich, B.S., Nam, N.M.: Applications of variational analysis to a generalized Fermat–Torricelli problem. J. Optim. Theory Appl. 148, 431–454 (2011)
Alegre, C., Ferrando, I.: Quotient subspaces of asymmetric normed linear spaces. Bol. Soc. Mat. Mexicana 3(13), 357–365 (2007)
Zălinescu, C.: Convex Analysis in General Vector Spaces. World Scientific Publishing Co., Inc., River Edge, NJ (2002)
Ghandehari, M.: Heron’s problem in the Minkowski plane, Tech. Report 306, Math. Dept., Univ. of Texas at Arlington (1997).
Mordukhovich, B.S., Nam, N.M., Salinas, J.: Applications of variational analysis to a generalized Heron problem. Appl. Anal. 91, 1915–1942 (2012)
Mordukhovich, B.S., Nam, N.M., Salinas, J.: Solving a generalized Heron problem by means of convex analysis. Am. Math. Monthly 119, 87–99 (2012)
Nam, N.M., Hoang, N., An, N.T.: Constructions of solutions to generalized Sylvester and Fermat–Torricelli problems for Euclidean balls. J. Optim. Theory Appl. 160, 483–509 (2014)
Nam, N.M., Hoang, N.: A generalized Sylvester problem and a generalized Fermat–Torricelli problem. J. Convex Anal. 20, 669–687 (2013)
Mordukhovich, B.S., Nam, N.M.: Subgradients of minimal time functions under minimal requirements. J. Convex Anal. 18, 915–947 (2011)
Chen, P.-C., Hansen, P., Jaumard, B., Tuy, H.: Solution of the multisource Weber and conditional Weber problems by D.-C. programming. Oper. Res. 46, 548–562 (1998)
An, N.T., Nam, N.M., Yen, N.D.: A D.C. algorithm via convex analysis approach for solving a location problem involving sets. arXiv:1404.5113v2 (2014).
Nickel, S., Dudenhöffer, E.-M.: Weber’s problem with attraction and repulsion under polyhedral gauges. J. Global Optim. 11, 409–432 (1997)
Bačák, M.: Convex Analysis and Optimization in Hadamard Spaces. De Gruyter, Berlin (2014)
Udrişte, C.: Convex Functions and Optimization Methods on Riemannian Manifolds. Kluwer Academic, Dordrecht (1994)
Acknowledgments
This research was partially worked out when the fourth-named author held a visiting professorship at the Faculty of Mathematics of the Otto von Guericke University of Magdeburg, Germany.
Author information
Authors and Affiliations
Corresponding author
Additional information
Communicated by Amir Beck.
Rights and permissions
About this article
Cite this article
Jahn, T., Kupitz, Y.S., Martini, H. et al. Minsum Location Extended to Gauges and to Convex Sets. J Optim Theory Appl 166, 711–746 (2015). https://doi.org/10.1007/s10957-014-0692-6
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10957-014-0692-6
Keywords
- Duality
- Fermat-Torricelli problem
- Generalized \(d\)-segments
- Hahn-Banach Theorem
- Minkowski space
- Polarity