Download e-book for iPad: Discrete Optimization with Interval Data: Minmax Regret and by Adam Kasperski

By Adam Kasperski

ISBN-10: 3540784837

ISBN-13: 9783540784838

In operations study purposes we're frequently confronted with the matter of incomplete or doubtful information. This ebook considers fixing combinatorial optimization issues of vague facts modeled through periods and fuzzy periods. It makes a speciality of a few simple and conventional difficulties, akin to minimal spanning tree, shortest direction, minimal task, minimal reduce and diverse sequencing difficulties. The period established method has develop into extremely popular within the fresh decade. selection makers are frequently attracted to hedging opposed to the danger of terrible (worst case) method functionality. this can be relatively very important for judgements which are encountered just once. so as to compute an answer that behaves quite lower than any most probably enter info, the maximal remorse criterion is conventional. lower than this criterion we search an answer that minimizes the biggest deviation from optimal over all attainable realizations of the enter data.

The minmax remorse method of discrete optimization with period facts has attracted enormous recognition within the fresh decade. This e-book summarizes the state-of-the-art within the zone and addresses a few open difficulties. in addition, it features a bankruptcy dedicated to the extension of the framework to the case whilst fuzzy periods are utilized to version doubtful information. the bushy durations let a extra refined uncertainty review within the surroundings of hazard theory.

This ebook is a important resource of data for all operations learn practitioners who're drawn to glossy techniques to challenge fixing. except the outline of the theoretical framework, it additionally provides a few algorithms that may be utilized to unravel difficulties that come up in practice.

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Additional info for Discrete Optimization with Interval Data: Minmax Regret and Fuzzy Approach

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Thus after removing element f and adding uk to B, base B ∗ contains e and B ∗ is optimal under S. This contradicts the maximality of k. (⇐) It is a direct consequence of the fact that Bσ(S,e) is the optimal base in scenario S. 16. Let P be a matroidal problem with interval weights and let e ∈ E be a given element. 5) + δe (S{e} ). 6) δe = Proof. Let S be a scenario that minimizes deviation δe (S). Let Y be the solution in Φe of the smallest value of F (Y, S). Note that e ∈ Y . Thus δ e = F (Y, S) − F ∗ (S).

17 now yields {e} that e is not possibly optimal, which is a contradiction. (⇐) Suppose, by contradiction, that w e ≤ w f and e is not possibly optimal. 17, e does not belong to an optimal solution under scenario − − S{e} . It is easy to see that in this case B + must be optimal in scenario S{e} . But + now we can construct another solution B = B ∪{e}\{f }, which by our assump− . Theretion that w e ≤ w f , has a weight not greater than B + in scenario S{e} − fore, base B is optimal in S{e} and element e ∈ B is possibly optimal which is a contradiction.

In this section we show that every optimal robust solution is possibly optimal and this is precisely the solution that minimizes the distance to the necessary optimality. Let S ∈ Γ be a given scenario. 1) δX (S) = F (X, S) − F ∗ (S). We can define the widest interval ΔX = [δ X , δ X ] of possible values of deviation of solution X, where δ X = min δX (S), δ X = max δX (S). 1. A solution X ∈ Φ is possibly optimal if and only if δ X = 0 and it is necessarily optimal if and only if δ X = 0. So, the concept of a deviation allows us to express both possible and necessary optimality of a solution.

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Discrete Optimization with Interval Data: Minmax Regret and Fuzzy Approach by Adam Kasperski

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