Download Bi-Level Strategies in Semi-Infinite Programming by Oliver Stein PDF

By Oliver Stein

Semi-infinite optimization is a vibrant box of energetic study. lately semi­ endless optimization in a common shape has attracted loads of realization, not just due to its outstanding structural features, but additionally a result of huge variety of purposes which are formulated as normal semi-infinite courses. the purpose of this publication is to spotlight structural elements of normal semi-infinite programming, to formulate optimality stipulations which take this constitution into consideration, and to provide a conceptually new resolution strategy. actually, below definite assumptions common semi-infinite courses might be solved successfully while their bi-Ievel constitution is exploited effectively. After a short creation with a few old history in bankruptcy 1 we be­ gin our presentation via a motivation for the looks of normal and basic semi-infinite optimization difficulties in functions. bankruptcy 2 lists a few difficulties from engineering and economics which provide upward thrust to semi-infinite versions, together with (reverse) Chebyshev approximation, minimax difficulties, ro­ bust optimization, layout centering, illness minimization difficulties for operator equations, and disjunctive programming.

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N. 05 iii = z* + J. 05 Vn(n en + l)j 2 = 1, ... , n j ' j=l, ... e. = lin, j 1, ... , n, with optimal value z*. 5, and n = 150 this is the choice made in [8J. 2 A more general choice ofY is with 8 E [1,00]. 1, the sets Yl and Y 00 are polytopes. For all other choices of 8 we obtain a more general nonempty and compact convex set Yo , but we still deal with a standard semi-infinite optimization problem. 3 Finally we can also consider the case in which the risk aversion of the decision maker depends on the point x.

11. A local description of M around if by active constraints Proof. 9) is trivial. Assume that the inclusion ":::>" does not hold. DVitisct'i(xV) ~ 0, i E Io(x),and there exists an index iv E 18(x) such that ct'dxV) > O. DV without loss of generality, so that the upper semi-continuity of ct'io and the feasibility of x imply o~ limsup ct'io(XV) ~ ct'io(x) v~oo However, this means that io E Io(x), a contradiction.

Analogous remarks hold for the upper limit. 1. 5 For a function limipf f(x) x-tx = f : JRn -+ JR and a point x E JRn it is min{ a E JR 13 XV -+ x with f(x V) -+ a} . 5 means that lim infx-tx f(x) coincides with the smallest cluster point in JR that sequences (f (XV)) vEIN with XV -+ x can exhibit. 6) is highly important as it means that the lower limit is actually attained for some sequence. By infxEB (X,6) f(x) :::; f(x) for,5 > 0 we always have limipf f(x) :::; f(x) x-tx and analogously lim sup f(x) x-tx ~ f(x).

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