Do reflection and time-shifting commute? That is, do the two block diagrams in Figure 1.20 provide identical signals, i.e., is y(t) equal to z(t)? To provide an answer to this consider the signal x(t) shown in Figure 1.20 is the input to the two block diagrams. Find y(t) and z(t), plot them and compare these plots. What is your conclusion? Explain.

Figure 1.20:

| v(1) Reflection x(t) y(t) Delay by 2 r(t) z(t) w(t) Reflection Delay by 2 x(t)