By Jon Lee

ISBN-10: 0521010128

ISBN-13: 9780521010122

ISBN-10: 0521811511

ISBN-13: 9780521811514

Jon Lee makes a speciality of key mathematical rules resulting in important versions and algorithms, instead of on facts buildings and implementation information, during this introductory graduate-level textual content for college kids of operations study, arithmetic, and laptop technological know-how. the point of view is polyhedral, and Lee additionally makes use of matroids as a unifying proposal. subject matters comprise linear and integer programming, polytopes, matroids and matroid optimization, shortest paths, and community flows. difficulties and workouts are incorporated all through in addition to references for additional learn.

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**Additional resources for A First Course in Combinatorial Optimization **

**Sample text**

There are three cases to consider: (1) If B has a zero column, then det(B) = 0; (2) if every column of B has two nonzeros, then the rows of B add up to the zero vector, so det(B) = 0; (3) if some column of B has exactly one nonzero, then we may expand the determinant along that column, and the result easily follows by use of the inductive hypothesis. A graph is bipartite if there is a partition of V (G) into V1 (G) and V2 (G) (that is, V (G) = V1 (G) ∪ V2 (G), V1 (G) ∩ V2 (G) = ∅, E(G[V1 ]) = E(G[V2 ]) = ∅), so that all edges have one vertex in V1 (G) and one in V2 (G).

This is a contradiction. Redundancy Theorem. Valid inequalities that describe faces of P having dimension less than dim(P) − 1 are redundant. 5 Polytopes 31 Proof. Without loss of generality, we can describe P as the solution set of n ai j x j = bi , for i = 1, 2, . . , k; j=1 n ai j x j ≤ bi , for i = 0, 1, . . , m, j=1 where the equations n ai j x j = bi , for i = 1, 2, . . , k, j=1 are linearly independent, and such that for i = 0, 1, . . , m, there exist points x i in P with n ai j x ij < bi .

P, i = 1, 2, . . , m(k). m(k) k k y i bi Optimality of x for Pk and y k for Dk implies that nj=1 ckj x j = i=1 when the Strong Duality Theorem is applied to the pair Pk , Dk . Using the n fact that we have a weight splitting, we can conclude that j=1 c j x j = p m(k) k k y b . The result follows by application of the Weak Duality Thei=1 i i k=1 orem to the pair P, D. cls 20 T1: IML December 11, 2003 16:30 Char Count= 0 0 Polytopes and Linear Programming Proposition (Necessity of weight splitting).

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Categories: Linear Programming