Chukwunwike (Chike) Edozien Umezei Obi, Nigerian mathematician (Zaria, Kaduma 07 April 1921- Onitsha, Anambra State 13 May 2008) Gave monumental contribution to area of modelling with second order non-linear different equations Contributed to finding a solution to Fermat’s theorem (1994) Fermat’s last theorem. Algebras Group Geom. 15(3):289-98, 1998 A system of order 2 in which small subharmonics and large subharmonics coexist. Proc. Roy. Soc. Edinburgh Sect A 108(1-2):35-44, 1988 Analytical theory of non-linear oscillations. I. An existence theorem for periodic oscillations of equations of the second order. Proc. Cambridge Philos. Soc. 76:285-96, 1974 A non-linear differential equation of the second order with periodic solutions whose associated limit cycles are algebraic curves. J. London Math. Soc. 28:356-60, 1953 Received the International Centre for Theoretical Physics Prize 1985 “for significant contributions in the study of nonlinear ordinary differential equations with several parameters for which he established numerous results on the existence, number and some analytical expressions of harmonic, subharmonic or uniformly almost periodic solutions” |

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