is a Japanese mathematician. He is professor of mathematics at

Nagoya University , abbreviated to or NU, is a Japanese national research university located in Chikusa-ku, Nagoya. It was established in 1939 as the last of the nine Imperial Universities in the then Empire of Japan, and is now a Designated National Universit ...

Nagoya is the largest city in the Chūbu region of Japan. It is the list of cities in Japan, fourth-most populous city in Japan, with a population of 2.3million in 2020, and the principal city of the Chūkyō metropolitan area, which is the List of ...

, Japan.

Education and career

Matsumoto graduated from the

University of Tokyo The University of Tokyo (, abbreviated as in Japanese and UTokyo in English) is a public research university in Bunkyō, Tokyo, Japan. Founded in 1877 as the nation's first modern university by the merger of several pre-westernisation era ins ...

in 1981. He got a doctoral degree from

Rikkyo University , also known as Saint Paul's University, is a private university, in Ikebukuro, Tokyo, Japan. Rikkyo is one of the five MARCH (Japanese universities), MARCH universities, the group of private universities in the Kantō region, Kanto region, toge ...

in 1986, advised by Akio Fujii. His thesis was titled ''Discrepancy estimates for the value-distribution of the Riemann zeta-function''. He became a lecturer at

Iwate University Iwate University (, ''Iwate Daigaku'', abbreviated as ''Gandai'' or ''岩大'') is a national university located in Morioka, Japan. Founded in 1876 as the , the school was formally established as Iwate University in 1949. With its main campus loc ...

in 1987 and an associate professor there in 1990. He joined Nagoya University in 1995, becoming a full professor there in 2001.

Research

Matsumoto's specializations include

number theory Number theory is a branch of pure mathematics devoted primarily to the study of the integers and arithmetic functions. Number theorists study prime numbers as well as the properties of mathematical objects constructed from integers (for example ...

, zeta theory, and

mathematical analysis Analysis is the branch of mathematics dealing with continuous functions, limit (mathematics), limits, and related theories, such as Derivative, differentiation, Integral, integration, measure (mathematics), measure, infinite sequences, series ( ...

. He is mostly recognized for the

Matsumoto zeta function In mathematics, Matsumoto zeta functions are a type of zeta function introduced by Kohji Matsumoto in 1990. They are functions of the form :\phi(s)=\prod_\frac where ''p'' is a prime and ''A'p'' is a polynomial In mathematics, a polynomial is ...

, a zeta function named after him. He co-edited ''Analytic Number Theory'' (2002), a book about

prime numbers A prime number (or a prime) is a natural number greater than 1 that is not a product of two smaller natural numbers. A natural number greater than 1 that is not prime is called a composite number. For example, 5 is prime because the only ways ...

, divisor problems,

Diophantine equations ''Diophantine'' means pertaining to the ancient Greek mathematician Diophantus. A number of concepts bear this name: *Diophantine approximation In number theory, the study of Diophantine approximation deals with the approximation of real n ...

, and other topics related to

analytic number theory In mathematics, analytic number theory is a branch of number theory that uses methods from mathematical analysis to solve problems about the integers. It is often said to have begun with Peter Gustav Lejeune Dirichlet's 1837 introduction of Dir ...

, including Diophantine approximations, and the theory of zeta and L-functions. His other book, ''Algebraic And Analytic Aspects Of Zeta Functions And L-Functions'', a compilation of lectures at the French-Japanese Winter School, was published in 2010.

Selected publications

* * * * * * * * * * * *

References

External links

* {{DEFAULTSORT:Matsumoto, Kohji Living people 20th-century Japanese mathematicians 21st-century Japanese mathematicians Academic staff of Nagoya University Number theorists Year of birth missing (living people) Rikkyo University alumni University of Tokyo alumni