Chapter 2 Section 1 Question 9
Question
Let $S={\{1,2,3,4\}}$, $X=\textit{I}_{\{1,2\}}$, $Y(s)=s^2X(s)$
  1. Compute $Y(1)$
  2. Compute $Y(2)$
  3. Compute $Y(4)$
Answer
Author: Mohammad-Ali Bandzar| Date:Oct 14 2020
(a) Compute $Y(1)$
$$Y(1)=1^2\times X(1)$$ $$Y(1)=1\times 1$$ $$Y(1)=1$$
(b) Compute $Y(2)$
$$Y(2)=2^2\times X(2)$$ $$Y(2)=4\times 1$$ $$Y(2)=4$$
(c) Compute $Y(4)$
$$Y(4)=4^2\times X(4)$$ $$W(4)=16\times 0$$ $$W(4)=0$$