### Biography

James Okoye Chukuka Ezeilo, Nigerian mathematician (Nanka, Anambra State 17 January 1930 – Lagos 04 January 2013)

Authored over 90 papers

Pioneer in the use of Leray-Schauder degree type method to obtain existence results for periodic solutions of ordinary differential equations

Eponym of Ezeilo constant

### SOME CONTRIBUTIONS

Uniqueness theorems for periodic solutions of certain fourth and fifth order differential systems. J. Nigerian Math. Soc. 2:55-9, 1983

An instability theorem for a certain sixth order differential equation. J. Austral. Math. Soc. Ser. A 32 (1):129-133, 1982

A further instability theorem for a certain fifth-order differential equation. Math. Proc. Cambridge Philos. Soc. 86 (3):491-3, 1979.

Instability theorems for certain fifth-order differential equations . Math. Proc. Cambridge Philos. Soc. 84 (2):343-50, 1978

An instability theorem for a certain fourth order differential equation . Bull. London Math. Soc. 10 (2):184-5, 1978

Some new criteria for the existence of periodic solutions of a certain second order differential equation . Atti Accad. Naz. Lincei Rend. Cl. Sci. Fis. Mat. Natur. (8) 56 (5), 675-83, 1974

With H.O. Tejumola. Boundedness theorems for certain third order differential equations . Atti Accad. Naz. Lincei Rend. Cl. Sci. Fis. Mat. Natur. (8) 55 (1973), 194-201 (1974).

A boundedness theorem for a certain nth order differential equation . Ann. Mat. Pura Appl. (4) 88:135-42, 1973

A boundedness theorem for a certain fourth order differential equation . J. London Math. Soc. (2) 5:376-84, 1972.

With H. O. Tejumola. Boundedness theorems for some fourth order differential equations . Ann. Mat. Pura Appl. (4) 89:259-75, 1971

With H. O. Tejumola. A boundedness theorem for a certain fourth order differential equation . Ann. Mat. Pura Appl. (4) 88:207-16, 1971

A generalization of a theorem of Reissig for a certain third order different equation . Ann. Mat. Pura Appl. (4) 87:349-56, 1970

A generalization of a boundedness theorem for a certain third-order differential equation Proc. Cambridge Philos. Soc. 63:735-42, 1967

Corrigendum: A boundedness theorem for a certain third-order differential equation . Proc. London Math. Soc. (3) 17:382-4, 1967

A boundedness theorem for some non-linear differential equations of the third order. J. London Math. Soc. 37:469-74, 1972

A boundedness theorem for a differential equation of the third order 1963

A boundedness theorem for a certain third-order differential equation. Proc. London Math. Soc. (3) 13: 99-124, 1963

On the existence of periodic solutions of a certain third-order differential equation. Proc. Cambridge Philos. Soc. 56:381-9, 1960