Linear Systems
According to what I have understood, If a system input x(t) produces and output y(t), then it follows that if the system input is x(t+d) then output will be y(t+d). Also another idea is, If x1(t) --> y1(t) and x2(t) --> y2(t), then it follows that the input to the same system a1.x1(t)+a2.x2(t) gives output a1y1(t)+ a2y2(t)
