By Terence Tao

There are various bits and items of folklore in arithmetic which are handed down from consultant to scholar, or from collaborator to collaborator, yet that are too fuzzy and non-rigorous to be mentioned within the formal literature. regularly, it was once an issue of good fortune and placement as to who discovered such folklore arithmetic. yet at the present time, such bits and items could be communicated successfully and successfully through the semiformal medium of study running a blog. This e-book grew from the sort of weblog. In 2007, Terry Tao started a mathematical weblog to hide quite a few themes, starting from his personal learn and different contemporary advancements in arithmetic, to lecture notes for his periods, to non-technical puzzles and expository articles. The articles from the 1st 12 months of that weblog have already been released by means of the AMS. The posts from 2008 are being released in volumes. This publication is a component I of the second-year posts, concentrating on ergodic thought, combinatorics, and quantity concept. bankruptcy 2 includes lecture notes from Tao's direction on topological dynamics and ergodic concept. via a number of correspondence rules, recurrence theorems approximately dynamical structures are used to turn out a few deep theorems in combinatorics and different components of arithmetic. The lectures are as self-contained as attainable, focusing extra at the ``big picture'' than on technical info. as well as those lectures, a number of different themes are mentioned, starting from fresh advancements in additive top quantity concept to expository articles on person mathematical issues akin to the legislation of huge numbers and the Lucas-Lehmer attempt for Mersenne primes. a few chosen reviews and suggestions from weblog readers have additionally been included into the articles. The ebook is appropriate for graduate scholars and study mathematicians attracted to large publicity to mathematical subject matters.

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**Extra info for Poincares legacies: pages from year two of a mathematical blog**

**Example text**

Let X be a non-negative random variable with EX < ∞, and let 1 ≤ n1 ≤ n2 ≤ n3 ≤ . . be a sequence of integers which is lacunary in the sense that nj+1 /nj > c for some c > 1 and all sufficiently large j. Then X nj converges almost surely to EX. 5. 16) we would see that almost surely the empirical means X n cannot deviate by more than a multiplicative error of 1+O(ε) from the mean EX. Setting ε := 1/m for m = 1, 2, 3, . . (and using the fact that a countable intersection of almost sure events remains almost sure) we obtain the full strong law.

Since all geodesics in the stadium hit the boundary, this in principle allows us to understand the distribution of an eigenfunction on the boundary in terms of the eigenfunction in the interior. Indeed, one can show that an eigenfunction which is uniformly distributed in phase space in the interior, will have a normal derivative which is uniformly distributed on the boundary (rigorous formulations of this fact date 48 1. Expository articles back to [GeLe1993]. Thus, by assumption, every eigenvector is uniformly distributed on the boundary.

2, so suppose inductively that s ≥ 2 and that the claim has already been proven for smaller s. We then look at the vertical torus Gs /(Γ ∩ Gs ) ≡ Td , where Gs is the last non-trivial group in the lower central series (and thus central). The quotient of the nilmanifold G/Γ by this torus action turns out to be a nilmanifold of one lower step (in which G is replaced by G/Gs ) and so the projection of the orbit (g n x)∞ n=1 is then equidistributed by induction hypothesis. 5. The strong law of large numbers 23 quotienting out by the diagonal action of the torus, is equidistributed with respect to some measure which is invariant under the residual torus Td × Td /(Td )∆ .