Asymptotic Behavior and Periodisity of Solutions of Differdntial Equations

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Stability therorems obtained in articles by Murakami-Yamamoto [3] [13], Wada-Yamamoto [4] [11], Saito-Yamamoto [6] [10], and Ohe-yamamoto [7] [15] are extensitions of many results.Oscillation theorems for second order nonlinear differential equations by Nagabuchi-Yamamoto [2] are extensions of those obtained by yan in 1986.On the existence of periodic solutions of nonlinear systems are considered in Saito-Yamamoto [5] and Sugie-Yamamoto [14] and had new results.Uniqueness theorems of periodic solutions of Lineard equations are proved in Hirano-Yamamoto [1] [12].Existence theorems of solutions for quasilinear systems are proved in Saito-Yamamoto [8] [9].Continuous dependence of periodic solutions for periodic systems are discussed in Saito-Yamamoto [16] and obtained extensions of the theorems due to Cronin, Hale and Mawhin respectively.All results above are extensions of those obtained by many authors. Throughout the above articles, it can be considered that almost all of our purpose had been achieved.