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I am just beginning to read into pseudorandom generators and I came across this definition for a PRG:
$G_n : \{0,1\}^n \rightarrow \{0,1\}^{l(n)}, \quad \text{ where $l(n)$ is a polynomial}$
Is there a reason why $l(n)$ has to be polynomial? Wouldn't there be an even better security guarantee if ...