Yoshiharu Kohayakawa (Japanese: 小早川美晴; born 1963) is a

Japanese-Brazilian , , lead=yes are Brazilian citizens who are nationals or naturals of Japanese ancestry or Japanese immigrants living in Brazil or Japanese people of Brazilian ancestry. The first group of Japanese immigrants arrived in Brazil in 1908. Brazil is ...

mathematician working on

discrete mathematics Discrete mathematics is the study of mathematical structures that can be considered "discrete" (in a way analogous to discrete variables, having a bijection with the set of natural numbers) rather than "continuous" (analogously to continuous f ...

and

probability theory Probability theory is the branch of mathematics concerned with probability. Although there are several different probability interpretations, probability theory treats the concept in a rigorous mathematical manner by expressing it through a set o ...

.Brazilian Academy of Sciences – Yoshiharu Kohayakawa
He is known for his work on Szemerédi's regularity lemma, which he extended to sparser graphs.

Biography

Kohayakawa was a student of

Béla Bollobás Béla Bollobás FRS (born 3 August 1943) is a Hungarian-born British mathematician who has worked in various areas of mathematics, including functional analysis, combinatorics, graph theory, and percolation. He was strongly influenced by Paul E ...

at the

University of Cambridge , mottoeng = Literal: From here, light and sacred draughts. Non literal: From this place, we gain enlightenment and precious knowledge. , established = , other_name = The Chancellor, Masters and Schola ...

. According to

Google Scholar Google Scholar is a freely accessible web search engine that indexes the full text or metadata of scholarly literature across an array of publishing formats and disciplines. Released in beta in November 2004, the Google Scholar index includes p ...

, as of August 21, 2019, Kohayakawa's works have been cited over 3194 times, and his

h-index The ''h''-index is an author-level metric that measures both the productivity and citation impact of the publications, initially used for an individual scientist or scholar. The ''h''-index correlates with obvious success indicators such as winn ...

is 33. He is a titular member of the

Brazilian Academy of Sciences The Brazilian Academy of Sciences ( pt, italic=yes, Academia Brasileira de Ciências or ''ABC'') is the national academy of Brazil. It is headquartered in the city of Rio de Janeiro and was founded on May 3, 1916. Publications It publishes a lar ...

. In 2000, five American researchers received a USA NSF Research Grant in the value of $20,000 to go to Brazil to work in collaboration with him on mathematical problems. Kohayakawa has an

Erdős number The Erdős number () describes the "collaborative distance" between mathematician Paul Erdős and another person, as measured by authorship of mathematical papers. The same principle has been applied in other fields where a particular individual ...

of 1.He wrot
"The size of the largest bipartite subgraphs", on ''Discrete Mathematics''
with Erdős and Gyárfás He was awarded the 2018

Fulkerson Prize The Fulkerson Prize for outstanding papers in the area of discrete mathematics is sponsored jointly by the Mathematical Optimization Society (MOS) and the American Mathematical Society (AMS). Up to three awards of $1,500 each are presented at e ...

References

External links

Home Page of Yoshiharu Kohayakawa at the University of São Paulo
{{DEFAULTSORT:Kohayakawa, Yoshiharu 1963 births Living people 20th-century Brazilian mathematicians 21st-century Brazilian mathematicians Members of the Brazilian Academy of Sciences Graph theorists Alumni of the University of Cambridge Academic staff of the University of São Paulo Expatriate academics in Brazil Brazilian people of Japanese descent