Chike Obi (April 17, 1921 – March 13, 2008) was a Nigerian politician, mathematician and professor.

Chike Obi (April 17, 1921 – March 13, 2008) was a Nigerian politician, mathematician and professor.

The African Mathematics Union suggests that he was the first sub-Saharan Africans to hold a doctorate in mathematics. Dr. Obi's early research dealt mainly with the question of the existence of periodic solutions of non-linear ordinary differential equations. He successfully used the perturbation technique and several of his publications greatly helped to stimulate research interest in this subject throughout the world and have become classics in the literature.

Obi is the author of several books and journals on mathematics and Nigerian politics.

Obi was educated in various parts of Nigeria before reading mathematics as an external student of the University of London. Immediately after his first degree, he won a scholarship to do research study at Pembroke College, Cambridge, followed by doctoral studies at Massachusetts Institute of Technology[citation needed] in Cambridge, Massachusetts, United States, becoming in 1950, the first Nigerian to receive a PhD in mathematics

Obi returned to lecture at the premier Nigerian University of Ibadan. He was soon diverted from this by political activities. After the war, he returned to lecture in 1970 at the University of Lagos where he quickly rose to the senior academic role of a professor.

He left Lagos to return to his root in the city of Onitsha, establishing the Nanna Institute for Scientific Studies.

Obi had won the Sigvard Ecklund Prize for original work in differential equation from the International Centre for Theoretical Physics. He was a university teacher until his retirement as an Emeritus Professor in 1985.

In 1997, Obi claimed to have found an elementary proof to Fermat’s Last Theorem. This work was carried out at his Nanna Institute for Scientific Studies in Onitsha, Eastern Nigeria and published in Algebras, Groups and Geometries. A review of this proof published in Mathematical Reviews claims that Obi's proof is a previously-known false proof. Fermat’s Last Theorem had already been solved in 1994 by Andrew Wiles and Richard Taylor

Obi helped form the Dynamic Party of Nigeria, of which he served as its first secretary-general. After the party merged with the larger National Council of Nigerian and Cameroon, Obi was elected as part of the Nigerian delegation that negotiated the country’s path to self-rule at two London conferences in 1957 and 1958.

After Nigeria’s independence from Britain in 1960, Obi was elected a legislator in the Eastern House of Assembly in 1960, he refused to vacate his seat in the national legislature in Lagos, the Speaker of the regional house ordered that Obi be physically removed by security agents. This order was obeyed and Obi decided to commit himself to regional affairs.

In 1962, Obi was arrested and charged with treason in a closed trial organized by the then national civilian government, who accused him and others, including the main opposition leader at the time, Obafemi Awolowo, of plotting to overthrow the government. He was later released for “want of evidence.”

When the Nigerian Civil War broke out in 1966, Obi sided with Biafra, working for the rebel leader Chukwuemeka Odumegwu Ojukwu. For a brief period in the 1970s when he served in the National Revenue Mobilization Commission.

Obi derided religion and ethnic extremism, and the culture of corruption pervading the Nigerian political class. He was a national newspaper columnist in the 1980s, writing under the title, "I speak For the People."

A visiting professor to the University of Rhode Island, USA, the University of Jos, Nigeria, and the Chinese Academy of Science, Obi was a recipient of the national honour of Commander of the Order of the Niger (CON) and a Fellow of the Nigerian Academy of Science.

Obi's wife Melinda died in late 2009, a fellow mathematician, and they are survived by their four children.