Ex.#4 Financial system Fluctuations in the price of zero-coupon bonds t=0 Time of purchase at price yo t=t Time of maturity at value yr y(t=values of bond at time t t=Influence of external factors on fluctuations in bond price dt x1(t),x2(),,xmN(t),t (①)=ym Observation: Even if the independent variable is time. there are interesting and important systems which have boundary conditionsEx. #4 Financial system Observation: Even if the independent variable is time, there are interesting and important systems which have boundary conditions. Fluctuations in the price of zero-coupon bonds t = 0 Time of purchase at price y0 t = T Time of maturity at value yT y(t) = Values of bond at time t x(t) = Influence of external factors on fluctuations in bond price