Download e-book for iPad: An Irregular Mind: Szemerédi is 70 by Noga Alon (auth.), Imre Bárány, József Solymosi, Gábor Sági

By Noga Alon (auth.), Imre Bárány, József Solymosi, Gábor Sági (eds.)

ISBN-10: 3642144438

ISBN-13: 9783642144431

Szemerédi's impact on modern-day arithmetic, specifically in combinatorics, additive quantity thought, and theoretical machine technology, is big. This quantity is a party of Szemerédi's achievements and character, at the celebration of his 70th birthday. It exemplifies his notable imaginative and prescient and targeted state of mind. a few colleagues and neighbors, all most sensible specialists of their fields, have contributed their most recent examine papers to this quantity. the themes comprise extension and functions of the regularity lemma, the life of k-term mathematics progressions in a number of subsets of the integers, extremal difficulties in hypergraphs thought, and random graphs, them all attractive, Szemerédi sort arithmetic. It additionally comprises released money owed of the 1st , very unique and hugely winning Polymath initiatives, one led through Tim Gowers and the opposite by means of Terry Tao.

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Bolyai 4, North Holland , Amsterdam, 1970,601-623 . [29J R. Impagliazzo, R. Paturi and F. Zane, Which problems have strongly exponential complexity ? J. Comput . Syst. , 63 (2001), 512-530 . [30] Y. Kohayakawa, V. Rodl , M. Schacht and E. Szemeredi, Sparse partition universal graphs for graphs of bounded degree, to appear. [31J A. Lubotzky, R. Phillips and P. Sarnak, Ramanujan Graphs, Combinatorica, 8 (1988), 261-277. [32J G. A. Margulis , Explicit group-theoretical constructions of combinatorial schemes and their application to the design of expanders and sup erconcentrators, Problems of Information Transmis sion, 24 (1988), 39-46.

Independent of A and T). 46 J . 6) can be improved. Theorem 3. Assume that in Theorem 2 we m ake the extra condition that A is a convex subset of the unit cube [O,I)d (d 2: 3). 7) T· vol (A)I 7 J 1 1 1 2 < c' (d) vol(A)(I-vol(A)) · T 2d- l . (logT)d-l(loglogT)d-l. 7) gives the square-root logarithmic order of magnitude yllog T . 1). 6) gives 1 1 T 1/ 4 . (log T) 4 (log log T) 2. 7) gives T 1/6 . 6) gives 1 1 T 1/ 3 . (log T) 6 (log log T) 3. 11) Note that both Theorem 2 and Theorem 3 are best possible apart from logarithmic factors.

The basic idea of generating pseudorandom numbers is to use exponential sequences. This is not too surprising, since independence is equivalent to the product rule, and exponential means iterated product. For example, consider the concrete exponential sequence (3/2t , n = 1,2,3, .. modulo one. There is an overwhelming numerical evidence that this sequence is uniformly distributed in the unit interval, and what is more, it exhibits all kind of characteristic properties of "randomness" . Unfortunately, we cannot prove anything for 3/2.

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An Irregular Mind: Szemerédi is 70 by Noga Alon (auth.), Imre Bárány, József Solymosi, Gábor Sági (eds.)


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