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Yahya Ben Al-Mokhtar Ben Hamidoun
Yahya Ben Hamidoun is a Mauritanian mathematician and a researcher who did many scientific studies and solved many math problems posed all around the world. Mostly the major problem posed by the Australian mathematician Terence Tao, who has the Fields medal 2006, equivalent of Noble price in mathematics, in “Hamidoun’s  Freiman-Kneser theorem for non-abrlian groups”

His professor Vergnas Las Michel said: “He is one of two who are well-versed in the subject of  primary research and the ability to connect graphs to the world”

Birth and education
Yahya Hamidoun was born in October 1947, according to the documents of civil status, in contrast of what his brother said to his colleagues that his date of birth was November 1948, but the Mauritanian families used to change the date of birth so their children can access colonial schools. He was born in a literary family more than a scientific one, they were famous of having many scholars, judges, historian, poet and writers, including his father, the historian and encyclopedic, Mokhtar Hamidoun who was famous by “Ibn Khaldoun of Mauritania”, and they said that the son Yahya in his childhood met the well-known discoverer Theodore Monod who visited the north of the country at that time looking for remnant and Mokhtar was his companion. The signs of genius were shown when he was a boy.

Education and Training
He studied in his childhood what children like him study in the region at that time, so he memorized Quran and studied initial books in Mahdara. Then he entered the primary school in 1959 and concluded it in three years, to join Boutililit Institute to become the youngest student there. In 1962 he traveled to Cairo for a scholarship, his father was working as a diplomat in Egypt at that time. He got the high school degree to enter the university of Ain Shams who graduated from it with a bachelor degree in mathematics with a perfect grade in 1970. After five years of teaching in the national high school in Nouakchott, he traveled to Paris to start the PhD journey by University of Paris 6 to get his degree with aggregation in 1978. The title of his research was: “Some problems of connectivity in directed graphs”

Jobs and responsibilities
During the period 1970 and 1975 he was teaching mathematics and physics in the national high school, the biggest and most famous high school at that time because there was not an academic university at that time. In 1979 he started his research journey in the French center for scientific studies (CNRS), and it kept going until his death, more than 30 years.

In 1981, he was promoted to a first degree researcher after the discussion of his thesis in the center that he remain among the most important researchers in it.

In addition to his studies, he taught and gave lectures in many universities worldwide in: France, Spain, Germany, Canada, The United States, Japan, Venezuela and India. He lectured in French, Arabic, English, German and Spanish.

His Contributions
He produced around one hundred scientific paper, some of them were in partnership with other famous colleagues. His page on ResearchGate indicates that his work did not stop after his death because five research papers were published between 2011 and 2013 by his name among the researchers, this number is considered as huge between African mathematicians.

In the first years of scientific research, the Mauritanian Professor Yahya Hamidoun focused on theories of graphs, so he dedicated around thirty papers to this part of mathematics. In 1978 he proved the credibility of Caccetta-Haggkvist theory in the case of transitive-vertices graphs.

He has some theories numerology, and his results are popular in collaboration with his colleague Silva Da Dias A.J. in the hypothesis of Erdos-Heilbronn published in Journal of the London Mathematical Society under the title: “Cyclic spaces for Grassmann derivatives and additive theory” 1994

His passion in open challenges posed by mathematicians was big, and his last achievement was his prove to Kneser’s theory 2010 that was famous in mathematics field, and it is a respond from this mathematician to an open question posed by the well known Japanese-Australian scientist Terence Tao, linked to some sides of Kneser’s theory in discordant groups.

In 2001, he was the first one to get Chinguetti prize, in its first version, in science and technology. The prize was given to him by the Mauritanian president at that time Muawiya Ould Taya to his work in additive of numbers theory.

His theories were generally about different scientific fields who can applied in the field of statistics and probabilities also media and technologies.

His Personality and relation with mathematics
He was a humble and calm man, he didn’t like to be famous that is why he isolated himself to grown his mind and to be mentally fit. They say that one of his grandfathers was interested in the study of logic.

Plagne Alain sees that these characteristics stoped him from the position of director in the centre and not the lack of supervision and controlling researches as some people said.

He had a great talent in intuition that helped him predict results correctly and fast before ending the logic sequence in Mathematics inference, and that’s why Yahya was a genius more than his camarades.

He loved intelligence and logic games. He spent his time in playing these games and showing his enthousiasme to mathematics thought them during his five years in the National High School. Among this games “Dhamet” (Zammet), and he was a local champion in it.

His relations with Mauritania
Yahya was far away from lights and politics after he left the country. He had a small journey, during his work in the National High School, doing politics and involving in Kadihines Parti. This involvement caused some conflicts with Mokhtar Ould Dadah government, even though the relations between Ould Dadah and his father were close, because of the invitation to let the colonized and his opposition to the only party. However his relations with Mauritania did not stop, he introduced his country, defended it and helped in many projects that touch the democracy, education and environment in Mauritania. People close to him said that he refused the French nationality.

He dreamt a lot of Mauritania as a big and developed country.

In 2002, he helped in Chinguitti Price conference by donating and his relations. The scientific conference brought many scholars and researchers to Nouakchott.

In the field of environment he had a position in the supreme council of the national reserve Hawd Arguin, and one time he led a campaign against an Australian Patrol company, so he brought a group of journalist to produce a documentary to show the corruption and environment disasters that will affect the reserve (2006)

He worked also in the development of the educational system in the country. In his last days he worked with professor Mohameden Ahmedou on the preparation classes to allow the Mauritanian students to entre the big engineering schools in France, but unfortunately death took him before achieving his dream.

He was famous by his generosity and kindness, he was always spending his vacations in villages and giving money to poor people.

His death
Ould Hamidoun died on 11 March 2011 in a hospitable in Paris because of blood poisoning. He passed with a silence leaving tens of scientific papers that were mentioned and appreciated by many big mathematicians.

Yahya Ould Hamidoun prize that is organized by the Mauritanian Organization to Promote Mathematics remains the only souvenir that link him to Mauritania organized every year until 2020.