Preface
This volume is dedicated to our friend, Misha Brin, on the occasion of his 60th
birthday.
Misha's involvement in mathematics began in 1963 when he entered the physical-
mathematical school No. 444 in Moscow. The 60s were the golden years of Soviet
education in physics and mathematics and many schools specializing in these two
disciplines opened in Moscow, Leningrad and some other major cities to attract
young boys and girls interested in pursuing a career in science. Stimulating cre-
ative and independent thinking, these schools gave their students the best possible
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