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Get Dual-Feasible Functions for Integer Programming and PDF

By Cláudio Alves, Francois Clautiaux, José Valério de Carvalho, Jürgen Rietz

ISBN-10: 3319276026

ISBN-13: 9783319276021

ISBN-10: 3319276042

ISBN-13: 9783319276045

This publication offers a postgraduate viewers the keys they should comprehend and extra improve a collection of instruments for the effective computation of decrease bounds and legitimate inequalities in integer courses and combinatorial optimization difficulties. After discussing the classical ways defined within the literature, the publication addresses the best way to expand those instruments to different non-standard formulations that could be utilized to a huge set of functions. Examples are supplied to demonstrate the underlying recommendations and to pave the best way for destiny contributions.

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Extra info for Dual-Feasible Functions for Integer Programming and Combinatorial Optimization: Basics, Extensions and Applications

Example text

XI k/ is extreme. 9. Which of the following statements are true and which are not? g. // of two maximal dual-feasible functions f ; g W Œ0; 1 ! , a mapping onto and not only into Œ0; 1. (b) A maximal dual-feasible function f W Œ0; 1 ! Œ0; 1 is surjective if and only if it is continuous. (c) If an extreme maximal dual-feasible function f W Œ0; 1 ! Œ0; 1 is convex on Œ0; 1=2, then f is continuous on Œ0; 1. 10. 0; 1=2 be a fixed parameter for the function fMT;0 W Œ0; 1 ! xI / WD 1; if x > 1 ; : x; otherwise.

In Chap. 4, we will discuss for instance an extension to multidimensional domains yielding the so-called vector packing dual-feasible functions, which may be used to compute bounds for vector packing problems. Extending the principles of dual-feasible functions to the domain of real numbers is not trivial. The properties that apply to dual-feasible functions, and which have been reviewed in the previous chapter, are affected in this exercise, and some of them are even lost. This makes the task of deriving good non-dominated functions much more difficult.

XI / WD 1; if x > 1 ; : x; otherwise. 16) (a) Show that this function is a maximal dual-feasible function. (b) Show that this function is extreme for Ä 1=4. 4. 11. 6 (p. 28) that if one has the constants ˛; ˇ 2 RC with ˛ˇ > 0 and two different maximal dual-feasible functions f ; g W Œ0; 1 ! Œ0; 1, ˇ ˛ then h WD ˛Cˇ f C ˛Cˇ g is a non-extreme maximal dual-feasible function. 12. Give an example that the composition of two non-symmetric, non-superadditive dual-feasible functions f ; g W Œ0; 1 !

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Dual-Feasible Functions for Integer Programming and Combinatorial Optimization: Basics, Extensions and Applications by Cláudio Alves, Francois Clautiaux, José Valério de Carvalho, Jürgen Rietz


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