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2.3 Show that (a) δ(n)= u(n)− u(n−1)(b) u(n)= ∑ k =−∞nδ(k)= ∑ k =0∞ δ(n−k)

2.3 Show that (a) δ(n)= u(n)− u(n−1)(b) u(n)= ∑ k =−∞nδ(k)= ∑ k =0∞ δ(n−k)

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2.3 Show that
(a) δ ( n ) = u ( n ) − u ( n − 1 )
(b) u ( n ) = ∑ k = − ∞ n δ ( k ) = ∑ k = 0 ∞ δ ( n − k )

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