| Budget Amount *help |
¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 1989: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1988: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1987: ¥600,000 (Direct Cost: ¥600,000)
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| Research Abstract |
In this research, we want to investigate the oscillatory or nonoscillatory properties of solutions of functional differential equations of the form x^<(n)>(t) + a(t)f(x(g(t))) = 0. These properties are important in the science. Here, we consider the case of the functional differential equation x'(t) + SIGMA^^n__p_i(t)|x(g_i(t))|^<alpha> sgn x(g_i(t)) = q(t)x(t) + r(t), alpha > 0 (1) and the Volterra integral equation x(t) = f(t) -*^t_ a(t,s)g(s,x(s))ds. One of the results is THEOREM. Under the proper assumptions on p_i,q, r and g_i, suppose there exist Q such that Q'(t) = r(t)exp(-*^t_ q(u)du), then every solution of (1) is oscillatory.
The other results obtained are printed in the papers listed in references. As its application, we investigate about the case of hazard function and the stochastic integral equations. Finally we make mention of the book in U. S. A. in which the earlier results of us are used as several theorems.
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