Paul Erdős (\er-dish) was one of the greatest mathematicians in 20th Century, a Jewish Hungarian, single, no job and and no home. He traveled around the world in one small suitcase containing his mathematical papers. He would knock impromptu at the door of his former students or math collaborators, started working and published the papers, then moved on to next destination the moment his overstay became unwelcome by the host’s wife. In this way he published 1,500 articles in his lifetime.
What is Erdős Number ?
Einstein had the Erdős Number 2 , through his assistant who co-wrote a paper with Paul Erdős.
As a side remark, the Chinese would like to know that Paul Erdős was a good friend of Hua Luogeng (Story #10). There are 2 anecdotes of their friendship below:
1. During the WWII when China was invaded by the Japanese, Paul’s students wanted to raise fund in the Berkeley university campus for Chinese war victims. They knew that leveraging on Paul Erdős reputation would be a great appeal to the fund-raising campaign. Someone put up a postal announcing a nude girl performance to be attended by Paul himself. Everybody knew Paul was never interested in girls (in the video he admitted he had a rare sensitivity against sexual pleasure). Paul obliged to honor the event by attending personally – wearing a pair of completely no-see-through dark glasses.
2. Paul got into trouble of his habit of writing postcards where the texts were openly visible to the FBI, especially he was from a communist Hungary. Once in his postcard to the communist China’s Hua Luogeng, his texts written as :”Dear Hua, …” followed immediately by all the ‘encrypted codes’ to the FBI agents (who were ‘mathematical idiots’ ): …
Paul was interrogated by the FBI on several occasions for spying. Later he chose the freedom by denouncing the USA citizenship, beginning his vagabond life till death.
In the Chinese greatest pugilistic Classic, read by fans globally including Deng Xiaoping, “射鵰英雄传” (The Legend of the Condor Heroes) by 金庸 (Jin Yong, aka Dr. Louis Cha), in which the Kungfu world (武林) was dominated by 4 grand masters:
(A) The northen vagabond beggar clan chief 北丏洪七公
(B) The western egoistic toxic master 西毒欧阳丰
(C) The southern seclusive monk 南僧段誉
(D) The eastern eccentric pharmacist 东邪黄药师
Interestingly the mathematical world is also characterized by the 4 grand masters: (1 to 1 mapping)
Books: (available for loan at the Singapore National Library)
2. “My Brain Is Open“