There can be multiple choices of shift operators other than those presented in this chapter. Unlike the classical shift, the shift operators W and ( I ? L) do not preserve energy of the graph signal. There also exists a shift operator [21] that preserves energy in the frequency domain. Note that energy of a signal f is || f|| 22
(a)
Proof.
(b)
Proof.
(c)
Proof.
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A. ?An arrow with a filled circle B. ?An arrow with an empty circle C. ?A line with a diamond on one end D. ?A line with a diamond on both ends