Download e-book for iPad: Algebraic and geometric ideas in the theory of discrete by Jesús De Loera, Raymond Hemmecke, Matthias Köppe

By Jesús De Loera, Raymond Hemmecke, Matthias Köppe

ISBN-10: 1611972434

ISBN-13: 9781611972436

ISBN-10: 2352372372

ISBN-13: 9782352372370

This e-book offers fresh advances within the mathematical thought of discrete optimization, fairly these supported by means of tools from algebraic geometry, commutative algebra, convex and discrete geometry, producing services, and different instruments in most cases thought of open air the normal curriculum in optimization.

Algebraic and Geometric rules within the concept of Discrete Optimization deals numerous learn applied sciences now not but renowned between practitioners of discrete optimization, minimizes must haves for studying those tools, and gives a transition from linear discrete optimization to nonlinear discrete optimization.

Audience: This ebook can be utilized as a textbook for complex undergraduates or starting graduate scholars in arithmetic, computing device technology, or operations learn or as an academic for mathematicians, engineers, and scientists engaged in computation who desire to delve extra deeply into how and why algorithms do or don't work.

Contents: half I: confirmed instruments of Discrete Optimization; bankruptcy 1: instruments from Linear and Convex Optimization; bankruptcy 2: instruments from the Geometry of Numbers and Integer Optimization; half II: Graver foundation tools; bankruptcy three: Graver Bases; bankruptcy four: Graver Bases for Block-Structured Integer courses; half III: producing functionality tools; bankruptcy five: creation to producing features; bankruptcy 6: Decompositions of Indicator features of Polyhedral; bankruptcy 7: Barvinok s brief Rational producing capabilities; bankruptcy eight: international Mixed-Integer Polynomial Optimization through Summation; bankruptcy nine: Multicriteria Integer Linear Optimization through Integer Projection; half IV: Gröbner foundation equipment; bankruptcy 10: Computations with Polynomials; bankruptcy eleven: Gröbner Bases in Integer Programming; half V: Nullstellensatz and Positivstellensatz Relaxations; bankruptcy 12: The Nullstellensatz in Discrete Optimization; bankruptcy thirteen: Positivity of Polynomials and international Optimization; bankruptcy 14: Epilogue

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Extra info for Algebraic and geometric ideas in the theory of discrete optimization

Example text

Fortunately, Grötschel, Lovász, and Schrijver [145] showed that such problems can be solved in polynomial time if and only if the following separation problem is solvable in polynomial time: Given a rational vector x determine whether it belongs to conv(F ) and, if not, find a separating hyperplane that separates x from conv(F ). The proof of this fundamental result depends on the ellipsoid method (for details see [145]) and it has a very broad applicability. A third application has to do with semidefinite optimization.

Xm+1 are the points we wanted. 2 (Minkowski’s first theorem). Let L be any lattice and let K ⊆ Rn be a convex set that is centrally symmetric (−x ∈ K if x ∈ K ). (a) If vol(K ) > 2n det(L), then K contains a nonzero lattice point. (b) If vol(K ) ≥ 2n det(L) and K is compact, then K contains a nonzero lattice point. Proof. Part (a). Let X = 12 K = x2 : x ∈ K . Then vol(X) = 2−n vol(K ) > det(L). 1, implies that there exists a pair x, y ∈ X such that x − y ∈ L \ {0}. Finally, 2x, 2y ∈ K , and since K is centrally symmetric, −2y ∈ K .

2 (Minkowski’s first theorem). Let L be any lattice and let K ⊆ Rn be a convex set that is centrally symmetric (−x ∈ K if x ∈ K ). (a) If vol(K ) > 2n det(L), then K contains a nonzero lattice point. (b) If vol(K ) ≥ 2n det(L) and K is compact, then K contains a nonzero lattice point. Proof. Part (a). Let X = 12 K = x2 : x ∈ K . Then vol(X) = 2−n vol(K ) > det(L). 1, implies that there exists a pair x, y ∈ X such that x − y ∈ L \ {0}. Finally, 2x, 2y ∈ K , and since K is centrally symmetric, −2y ∈ K .

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Algebraic and geometric ideas in the theory of discrete optimization by Jesús De Loera, Raymond Hemmecke, Matthias Köppe


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