Complexity and Approximation | Combinatorial Optimization Problems and Their Approximability Properties

Giorgio Ausiello (u. a.)

ISBN 10: 3540654313 ISBN 13: 9783540654315

Editorial: Springer-Verlag GmbH, 1999

Idioma: Ingl�s

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Detalles bibliogr�ficos

T�tulo

Complexity and Approximation | Combinatorial Optimization Problems and Their Approximability Properties

Editor

Springer-Verlag GmbH

Fecha de publicaci�n

1999

Idioma

Ingl�s

ISBN 10

3540654313

ISBN 13

9783540654315

Encuadernaci�n

Buch

Estado

Neu

Dimensiones

Peso

1256 gramos

Cat�logos de vendedores

B�cher

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Sinopsis

N COMPUTER applications we are used to live with approximation. Var� I ious notions of approximation appear, in fact, in many circumstances. One notable example is the type of approximation that arises in numer� ical analysis or in computational geometry from the fact that we cannot perform computations with arbitrary precision and we have to truncate the representation of real numbers. In other cases, we use to approximate com� plex mathematical objects by simpler ones: for example, we sometimes represent non-linear functions by means of piecewise linear ones. The need to solve difficult optimization problems is another reason that forces us to deal with approximation. In particular, when a problem is computationally hard (i. e. , the only way we know to solve it is by making use of an algorithm that runs in exponential time), it may be practically unfeasible to try to compute the exact solution, because it might require months or years of machine time, even with the help of powerful parallel computers. In such cases, we may decide to restrict ourselves to compute a solution that, though not being an optimal one, nevertheless is close to the optimum and may be determined in polynomial time. We call this type of solution an approximate solution and the corresponding algorithm a polynomial-time approximation algorithm. Most combinatorial optimization problems of great practical relevance are, indeed, computationally intractable in the above sense. In formal terms, they are classified as Np-hard optimization problems.

Rese�a del editor

This book documents the state of the art in combinatorial optimization, presenting approximate solutions of virtually all relevant classes of NP-hard optimization problems. The wealth of problems, algorithms, results, and techniques make it an indispensible source of reference for professionals. The text smoothly integrates numerous illustrations, examples, and exercises.

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