# erdossy arm

Erdős Pál (Hungarian: Erdős Pál, IPA: [ˈɛrdøːʃ ˈpaːl], English: Paul Erdős Paul Dos[*] (pronounced Paul Erdish in the book All We Mathematicians Are A Little Mad), 1913 26 March – 20 September 1996) was a Hungarian mathematician. He collaborated with hundreds of other mathematicians and made extensive work in combinatorics, graph theory, and number theory. He is also known for writing the most books after Leonhard Euler.

## Life

## Childhood

Erdos was born on March 26, 1913 in Budapest, Austria-Hungary, to a Jewish family. Erdős Lajos' father, Erdős Lajos, and his mother, Anna (Hungarian: Anna) were both teachers of mathematics. His father's surname was originally Engländer (Hungarian: Engländer), but he changed his name to "Er Dossi". Erdos had two older sisters, but died of scarlet fever before he was born, and was raised as the only son.
In 1914 his father, Erdős Lajos, was taken prisoner by the Russian Imperial Army that had been attacking the Austro-Hungarian Empire, where he was a prisoner of war in Siberia for six years. Her mother, after losing her husband and two daughters, became extremely obsessed with Erdos, who did not go to school and received tutoring at home. Erdos says that when he was four years old, he had already discovered some qualities in a few that were already known by himself.
After his father was released and returned in 1920, he taught his son mathematics and English.
Despite restrictions on admission to Jewish universities in Hungary at the time, Erdos entered the University of Ötvös Lorland in 1930 to win the state examination. In 1934, at the age of 21, he was awarded a doctorate degree under Fejér Lipót (Hungarian: Fejér Lipót).

## Age

In 1934, Erdos fled to Manchester, England, to escape Hungarian anti-Semitism. (Er Dossi's father and two uncles were executed during the Holocaust.) In 1938 he obtained a position at Princeton University, USA, but was not awarded tenure. It was around this time that he began the wandering research life that characterized his life.
According to the records, the record of Erdossi is that he was naive and possessed of a childlike personality. For example, in 1941, while having a heated discussion with another mathematician, he passed a military communications facility on Long Island, USA, who were arrested on spying charges, and the case was placed on the FBI archives. Also, for his fame and genius, Erdossi was warmly welcomed by any university. He wrote a dissertation with any mathematician who brought his favorite subject. As a result, he became the most collaborative mathematician in history, writing nearly 1,500 joint papers. The mathematicians who worked with him even coined the term Erdossi Sur. In this way, since Erdos rarely published thesis alone, he can be said to be the mathematician who made mathematics a 'social activity' more than anyone else.
Erdossi used the word "leave" to describe death and used the word "die" to refer to quitting mathematics. He called his children epsilon (epsilon, meaning infinitesimal in number theory) and loved them.
In the early 1950s, the FBI records of Erdossi brought him to the attention of the McCarthy Investigator. Because of this, Erdossi was suddenly denied a return visa to the United States. As a result, he spent much of the next ten years in Israel. 1960�