Download e-book for iPad: Complexity in Information Theory by Yaser S. Abu-Mostafa

By Yaser S. Abu-Mostafa

ISBN-10: 1461237742

ISBN-13: 9781461237747

ISBN-10: 1461283442

ISBN-13: 9781461283447

The skill and ends of knowledge idea and computational complexity have grown considerably nearer over the last decade. universal analytic instruments, similar to combinatorial arithmetic and knowledge circulation arguments, were the cornerstone of VLSl complexity and cooperative computation. the elemental assumption of restricted computing assets is the idea for cryptography, the place the excellence is made among to be had details and available details. quite a few different examples of universal pursuits and instruments among the 2 disciplines have formed a brand new learn classification of 'information and complexity theory'. This quantity is meant to show to the study neighborhood the various fresh major themes alongside this subject. The contributions chosen listed below are all very easy, almost immediately lively, particularly well-established, and stimulating for giant follow-ups. this isn't an encyclopedia at the topic, it's involved in simple terms with well timed contributions of enough coherence and promise. The sorts of the six chapters conceal a large spectrum from particular mathematical effects to surveys of enormous components. it truly is was hoping that the technical content material and subject matter of this quantity may help identify this common study zone. i need to thank the authors of the chapters for contributing to this quantity. I additionally want to thank Ed Posner for his initiative to deal with this topic systematically, and Andy Fyfe and Ruth Erlanson for proofreading the various chapters.

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Therefore, L = J ~ 3=1 ~ W/j. The I/s are still lengths of codewords in a prefix-free set. An argument similar to that used in Theorem 8, can show that Lemma 3 If S is partitioned by n into SI, ... , SJ, then L~ Therefore, every protocol ;::: H (lSjl/ISI : j tP = 1, ... , J) 0 E ~ satisfies L~ ;::: log(ISI/>'1) and from (3), L~ ;::: log(ISI/ >'1). This implies the existence of at least one input with that complexity. Thus Theorem 11 [DE 86] Example 7 x and y. For CR(f,O);::: log(ISI/>'1) for all S ~ {O,oo,n-l}x{O,oo,n-l} 0 Let d1JI(x, y) denote the Hamming distance between the two N-bit sequences N ;::: ° °: ; k ::; and N, define the function Hf : {O,l}N x {O,l}N --+ {O,l} by N( )def{l Hk x,y = ° ifd71(x,y)=k otherwise.

Neither randomization nor errors alone can help reduce the complexity from logn (see Example 7). The next example shows that, for some functions, randomization can reduce the worst-case complexity even in error-free computation. Example 6 [MS 82] Let M ~ 0, and x\ ... ,XM,yl, ... ,yM E {O,l}M (we index the se- quences with superscripts because subscripts were used earlier to denote a bit in a sequence). If n =2 M2 , then each (x\ ... , x M ) can be identified with an integer in {O, .. ,n-l}. The component equality function is defined as: if xi = yi for some 1 ~ i ~ M otherwise.

We noted that the result holds even for overlapping rectangles. Namely, CD(f, 0) ~ O(log2(ILo(f) + ILoO))). Combined with the last theorem, this implies that o Theorem 15 [AUY 83] This is a much sought-after type of result in computational complexity. The corresponding result would imply that if f is in both NP and co-NP, then it is in P. The 'converse' of this theorem is also very intriguing. We mentioned the interesting open question of whether the bound of Theorem 5 is tight. M. Yanakakis noted that, as far as overlapping covers are concerned, it almost is.

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Complexity in Information Theory by Yaser S. Abu-Mostafa

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