Mathematical Experimentation in Time-Lag Modulation Equations of the form du/dt = g(u(t),u(h(t))) arise in a number of scientific contexts. The authors point out some interesting properties of the solution u'(t) = -u(t-1-k*sin(wt))+sin(at). These properties were obtained by means of numerical solution. CACM October, 1966 Bellman, R. Buell, J. Kalaba, R. CA661003 JB March 2, 1978 4:08 PM 1364 4 1364 1280 5 1364 1364 5 1364 1364 5 1364 1364 5 1364