Andrey Kolmogorov

Andrey Nikolaevich Kolmogorov (Андре́й Никола́евич Колмого́ров, 25 April 1903 – 20 October 1987) was a Soviet mathematician who contributed to the mathematics of probability theory, topology, intuitionistic logic, Turbulence, classical mechanics, algorithmic information theory and computational complexity.

Andrey Kolmogorov was born in Tambov, about 500 kilometers south-southeast of Moscow, in 1903.

His unmarried mother, Maria Yakovlevna Kolmogorova, died giving birth to him.

Andrey was raised by two of his aunts in Tunoshna (near Yaroslavl) at the estate of his grandfather, a well-to-do nobleman.

Little is known about Andrey's father.

He was supposedly named Nikolai Matveyevich Katayev and had been an agronomist.

Katayev had been exiled from Saint Petersburg to the Yaroslavl province after his participation in the revolutionary movement against the tsars.

In 1910, his aunt adopted him, and they moved to Moscow, where he graduated from high school in 1920.

Later that same year, Kolmogorov began to study at Moscow State University and at the same time Mendeleev Moscow Institute of Chemistry and Technology.

Kolmogorov writes about this time: "I arrived at Moscow University with a fair knowledge of mathematics. I knew in particular the beginning of set theory. I studied many questions in articles in the Encyclopedia of Brockhaus and Efron, filling out for myself what was presented too concisely in these articles."

Kolmogorov gained a reputation for his wide-ranging erudition.

While an undergraduate student in college, he attended the seminars of the Russian historian S. V. Bakhrushin, and he published his first research paper on the fifteenth and sixteenth centuries' landholding practices in the Novgorod Republic.

He disappeared in 1919 and was presumed to have been killed in the Russian Civil War.

Andrey Kolmogorov was educated in his aunt Vera's village school, and his earliest literary efforts and mathematical papers were printed in the school journal "The Swallow of Spring".

Andrey (at the age of five) was the "editor" of the mathematical section of this journal.

Kolmogorov's first mathematical discovery was published in this journal: at the age of five he noticed the regularity in the sum of the series of odd numbers: etc.

During the same period (1921–22), Kolmogorov worked out and proved several results in set theory and in the theory of Fourier series.

In 1922, Kolmogorov gained international recognition for constructing a Fourier series that diverges almost everywhere.

Around this time, he decided to devote his life to mathematics.

In 1925, Kolmogorov graduated from Moscow State University and began to study under the supervision of Nikolai Luzin.

He formed a lifelong close friendship with Pavel Alexandrov, a fellow student of Luzin; indeed, several researchers have concluded that the two friends were involved in a homosexual relationship, although neither acknowledged this openly during their lifetimes.

Kolmogorov (together with Aleksandr Khinchin) became interested in probability theory.

Also in 1925, he published his work in intuitionistic logic, "On the principle of the excluded middle," in which he proved that under a certain interpretation all statements of classical formal logic can be formulated as those of intuitionistic logic.

In 1929, Kolmogorov earned his Doctor of Philosophy (Ph.D.) degree from Moscow State University.

In 1929, Kolmogorov and Alexandrov during a long travel stayed about a month in an island in lake Sevan in Armenia.

In 1930, Kolmogorov went on his first long trip abroad, traveling to Göttingen and Munich and then to Paris.

He had various scientific contacts in Göttingen, first with Richard Courant and his students working on limit theorems, where diffusion processes proved to be the limits of discrete random processes, then with Hermann Weyl in intuitionistic logic, and lastly with Edmund Landau in function theory.

His pioneering work About the Analytical Methods of Probability Theory was published (in German) in 1931.

Also in 1931, he became a professor at Moscow State University.

In 1933, Kolmogorov published his book, Foundations of the Theory of Probability, laying the modern axiomatic foundations of probability theory and establishing his reputation as the world's leading expert in this field.

In 1935, Kolmogorov became the first chairman of the department of probability theory at Moscow State University.

Around the same years (1936) Kolmogorov contributed to the field of ecology and generalized the Lotka–Volterra model of predator–prey systems.

During the Great Purge in 1936, Kolmogorov's doctoral advisor Nikolai Luzin became a high-profile target of Stalin's regime in what is now called the "Luzin Affair."

Kolmogorov and several other students of Luzin testified against Luzin, accusing him of plagiarism, nepotism, and other forms of misconduct; the hearings eventually concluded that he was a servant to "fascistoid science" and thus an enemy of the Soviet people.

Luzin lost his academic positions, but curiously he was neither arrested nor expelled from the Academy of Sciences of the Soviet Union.

The question of whether Kolmogorov and others were coerced into testifying against their teacher remains a topic of considerable speculation among historians; all parties involved refused to publicly discuss the case for the rest of their lives.

In a 1938 paper, Kolmogorov "established the basic theorems for smoothing and predicting stationary stochastic processes"—a paper that had major military applications during the Cold War.

In 1939, he was elected a full member (academician) of the USSR Academy of Sciences.

Soviet-Russian mathematician Semën Samsonovich Kutateladze concluded in 2013, after reviewing archival documents made available during the 1990s and other surviving testimonies, that the students of Luzin had initiated the accusations against Luzin out of personal acrimony; there was no definitive evidence that the students were coerced by the state, nor was there any definitive evidence to support their allegations of academic misconduct.

Soviet historian of mathematics A.P. Yushkevich surmised that, unlike many of the other high-profile persecutions of the era, Stalin did not personally initiate the persecution of Luzin and instead eventually concluded that he was not a threat to the regime, which would explain the unusually mild punishment relative to other contemporaries.