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Read e-book online Computational Complexity and Feasibility of Data Processing PDF

By Vladik Kreinovich, Anatoly Lakeyev, Jiří Rohn, Patrick Kahl (auth.)

ISBN-10: 144194785X

ISBN-13: 9781441947857

ISBN-10: 1475727933

ISBN-13: 9781475727937

Targeted viewers • experts in numerical computations, particularly in numerical optimiza­ tion, who're attracted to designing algorithms with automatie end result ver­ ification, and who might consequently have an interest in understanding how basic their algorithms caIi in precept be. • Mathematicians and computing device scientists who're attracted to the speculation zero/ computing and computational complexity, specifically computational com­ plexity of numerical computations. • scholars in utilized arithmetic and laptop technological know-how who're drawn to computational complexity of alternative numerical equipment and in studying common suggestions for estimating this computational complexity. The publication is written with all causes and definitions extra, in order that it may be used as a graduate point textbook. What this ebook .is approximately info processing. in lots of real-life occasions, we're drawn to the worth of a actual volume y that's diflicult (or even most unlikely) to degree without delay. for instance, it's very unlikely to without delay degree the volume of oil in an oil box or a distance to a celeb. considering the fact that we can't degree such amounts without delay, we degree them ultimately, via measuring another amounts Xi and utilizing the recognized relation among y and Xi'S to reconstruct y. The set of rules that transforms the consequences Xi of measuring Xi into an estimate fj for y is termed facts processing.

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Also, if Xi E [0,1], then xi(1 - Xi) ~ O. tive numbers and is, therefore, non-negative. Hence, J!. ~ o. Let us show that J!. = 0 if and only if the formula F is satisfiable. , it is true for some propositional vector Zl, ... , Xi = 1 if Zi = "true" and Xi = 0 if Zi = "false"). The values of Pi are chosen as folIows: • If Fj = a V b, and both a and bare true for Zi, then we take Pi = O. • If Fj = a V b, and only one of the literals a and b is true for a given choice of Zi, then we take Pj = 1. • If Fj = a V b V c, and all three literals are true, then Pj = O.

Algebraic complexity. RAM is slightly more realistic than a Turing machine, but it is still not very realistic. In real-life computers, in addition to operations with bits, we have a hardware support for elementary arithmetic operations such as addition and multiplication of two integers. It is therefore reasonable, given an input of length n, to assume that we can perform addition and multiplication of integers of length C· n (for some reasonable C) in a single step. The number of computational steps on such machine is called algebraic complexity.

In Meer [280, 282]. Because of this difference, in this book, we will not use BSS complexity. 5. 1. , the number of bits that form this input). 2. When is a Problem Tractable? 1. Ideal Solution is not yet Possible What would be an ideal solution. At first glance, now, that we have a definition of a feasible algorithm, we can describe which problems are tractable and which problems are intractable: If there exists a polynomial-time algorithm that solves all instances of a problem, this problem is tractable, otherwise, it is intractable.

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Computational Complexity and Feasibility of Data Processing and Interval Computations by Vladik Kreinovich, Anatoly Lakeyev, Jiří Rohn, Patrick Kahl (auth.)


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