Table of contents

Volume 62

Number 5, October 2007

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COMMUNICATIONS OF THE MOSCOW MATHEMATICAL SOCIETY

MATHEMATICAL LIFE

843

The differences are described between the statistics of the periodic continued fractions of quadratic irrational numbers and the universal Gauss-Kuzmin statistics of the continued fractions of random real numbers. Besides being a survey of these differences, this article discusses the results of V.A. Bykovskii [Bykovsky] and his school, who have proved the author's 1993 conjectures on the similarities of these statistics.

857

The theory of birational rigidity of rationally connected varieties generalises the classical rationality problem. This paper gives a survey of the current state of this theory and traces its history from Noether's theorem and the Lüroth problem to the latest results on the birational superrigidity of higher-dimensional Fano varieties. The main components of the method of maximal singularities are considered.

943

and

This paper is devoted to a description of the information system Math-Net.Ru, the All-Russian mathematical portal providing various resources to Russian and foreign mathematicians in their search for information for their scientific work (http://www.mathnet.ru/). The most interesting section of the portal is Journals, which combines Russian periodical and continuous publications in the mathematical sciences as a unified information system. The portal structure and its diverse opportunities and tools available for information searches are described. A survey of similar Russian and foreign systems is presented. This article is aimed at the wide community of mathematicians ready to use new information technologies in their research. Technical details of the system's realization are omitted, and attention is focused rather on a description of the users' possibilities.

967

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This article describes the mathematical information system MathTree, created and developed in the Siberian Branch of the Russian Academy of Sciences. Its potentials, current status, and prospects for future development are discussed.