This is a Chinese name; the family name is Chen.

Chen Jingrun (Traditional Chinese: 陳景潤; Simplified Chinese: 陈景润; Hanyu Pinyin: Chén Jǐngrùn; Wade-Giles: Ch'en Chingjun, May 22, 1933–March 19, 1996) was a Chinese mathematician who made significant contributions to number theory. Chen is ranked as one of leading mathematicians in the twentieth century and one of China's most influential mathematicians in history. is the 142nd day of the year (143rd in leap years) in the Gregorian calendar. ... 1933 (MCMXXXIII) was a common year starting on Sunday. ... is the 78th day of the year (79th in leap years) in the Gregorian calendar. ... Year 1996 (MCMXCVI) was a leap year starting on Monday (link will display full 1996 Gregorian calendar). ... Euclid, Greek mathematician, 3rd century BC, as imagined by by Raphael in this detail from The School of Athens. ... Chens theorem was first stated by Chinese mathematician Chen Jing Run in 1966[1], with further details of the proof in 1973[2]. His original proof was much simplified by P. M. Ross[3]. The theorem states that every sufficiently large even number can be written as the sum... Image File history File links Zhongwen. ... Japanese name Kanji: Kana: Korean name Hangul: Hanja: Vietnamese name Quoc Ngu: Hantu: A Chinese character (Simplified Chinese: ; Traditional Chinese: ; Pinyin: ) is a logogram used in writing Chinese, Japanese, sometimes Korean, and formerly Vietnamese. ... This article or section does not adequately cite its references or sources. ... A Chinese surname, family name (Chinese: ; pinyin: ) or clan name (氏; pinyin: shì), is one of the hundreds or thousands of family names that have been historically used by Han Chinese and Sinicized Chinese ethnic groups in mainland China, Taiwan, and among overseas Chinese communities. ... 陳; Chén Chén (Simplified Chinese: 陈, Traditional Chinese: 陳; Wade-Giles: Chen) is one of the most common Chinese family names. ... Traditional Chinese characters refers to one of two standard sets of printed Chinese characters. ... This article does not cite any references or sources. ... Pinyin (拼音, Pīnyīn) literally means join (together) sounds (a less literal translation being phoneticize, spell or transcription) in Chinese and usually refers to Hànyǔ Pīnyīn (汉语拼音, literal meaning: Han language pinyin), which is a system of... Wade-Giles, sometimes abbreviated Wade, is a Romanization (phonetic notation and transliteration) system for the Chinese language based on Mandarin. ... is the 142nd day of the year (143rd in leap years) in the Gregorian calendar. ... 1933 (MCMXXXIII) was a common year starting on Sunday. ... is the 78th day of the year (79th in leap years) in the Gregorian calendar. ... Year 1996 (MCMXCVI) was a leap year starting on Monday (link will display full 1996 Gregorian calendar). ... Leonhard Euler, considered one of the greatest mathematicians of all time A mathematician is a person whose primary area of study and research is the field of mathematics. ... Number theory is the branch of pure mathematics concerned with the properties of numbers in general, and integers in particular, as well as the wider classes of problems that arise from their study. ...

Personal life

Chen was the third son in a large family from Fuzhou, Fujian, China. His father was a postal worker. Chen Jingrun graduated from the Mathematics Department of Xiamen University in 1953. His advisor at Chinese Academy of Sciences was Hua Luogeng.   (Chinese: ; Pinyin: ; Wade-Giles: Fu-chou; BUC: Hók-ciÅ­; EFEO: Fou-Tcheou; also seen as Foochow or Fuchow) is the capital and the largest prefecture-level city of Fujian (福建) province, Peoples Republic of China. ...   (Chinese: ; pinyin: ; Wade-Giles: Fu-chien; Postal map spelling: Fukien, Foukien; local transliteration Hokkien from Min Nan Hok-kiàn) is one of the provinces on the southeast coast of the Peoples Republic of China. ... Xiamen University (XMU, Latin: Universitas Amoiensis, Pinyin: Xiàmén Dàxué, Simplified Chinese: 厦门大学), colloquially Xia Da (Pinyin: Xià Dà, Simplified Chinese: 厦大), located in Xiamen, Fujian Province, is the first university in China founded by overseas Chinese. ... The Chinese Academy of Sciences (Chinese: 中国科学院; pinyin: Zhōngguó KÄ“xuéyuàn), formerly known as Academia Sinica (not to be confused with Taiwans Academia Sinica currently headquartered in Taipei which shares the same root), is the national academy for the natural sciences of the Peoples Republic of... Hua Luogeng (1910 - 1985) was a mathematician from China. ...

Research

His work on the twin prime conjecture, Waring's problem, Goldbach's conjecture and Legendre's conjecture led to progress in analytic number theory. In a 1966 paper he proved what is now called Chen's theorem: every sufficiently large even number can be written as the sum of either two primes, or a prime and a semiprime (the product of two primes) — e.g., 100 = 23 + 7·11. The twin prime conjecture is a famous problem in number theory that involves prime numbers. ... In number theory, Warings problem, proposed in 1770 by Edward Waring, asks whether for every natural number k there exists an associated positive integer s such that every natural number is the sum of at most s kth powers of natural numbers. ... Goldbachs conjecture is one of the oldest unsolved problems in number theory and in all of mathematics. ... Adrien-Marie Legendre conjectured that there is a prime number between n² and (n+1)² for every integer n > 0. ... Analytic number theory is the branch of number theory that uses methods from mathematical analysis. ... In mathematics, a proof is a demonstration that, assuming certain axioms, some statement is necessarily true. ... Chens theorem was first stated by Chinese mathematician Chen Jing Run in 1966[1], with further details of the proof in 1973[2]. His original proof was much simplified by P. M. Ross[3]. The theorem states that every sufficiently large even number can be written as the sum... In mathematics, the phrase sufficiently large is used in contexts such as: is true for sufficiently large which is actually shorthand for: there exists an such that is true for all . ... In mathematics, a prime number (or a prime) is a natural number that has exactly two (distinct) natural number divisors, which are 1 and the prime number itself. ... In mathematics, a semiprime (also called biprime or 2-almost prime, or pq number) is a natural number that is the product of two (not necessarily distinct) prime numbers. ...

Commemorations

The Asteroid 7681 Chenjingrun was named after him. 253 Mathilde, a C-type asteroid. ...

In 1999, China issued an 80-cent postage stamp, titled The Best Result of Goldbach Conjecture, with a silhouette of Chen and the inequality:

Works

• J.-R. Chen, On the representation of a large even integer as the sum of a prime and a product of at most two primes, Sci. Sinica 16 (1973), 157–176.
• Chen, J.R, "On the representation of a large even integer as the sum of a prime and the product of at most two primes". [Chinese] J. Kexue Tongbao 17 (1966), 385–386.

See also

• Chen prime

A prime number p is called a Chen prime if p + 2 is either a prime or a product of two primes. ...

References

• Pan Chentong and Wang Yuan, Chen Jingrun: a brief outline of his life and works, Acta Math. Sinica (NS) 12 (1996) 225–233.

External links

• Chen Jingrun at the Mathematics Genealogy Project
• Chen's home page (in Chinese) at the Chinese Institute of Mathematics (in English).
• A Chinese stamp from 1999 commemorating Chen.