(5)
It should be
E
Δ[
n
]
X
*
[
n
]
= 0 but we assume
X
[
n
] real for simplicity.
Δ[n]X*[n]![]](livre1045x.png)
= 0 but we assume X[n] real for simplicity.Δ[n]X*[n] = 0 but we assume X[n] real for simplicity.