Average norms of polynomials

In this paper we study the average $\NL_{2α}$-norm over $T$-polynomials, where $α$ is a positive integer. More precisely, we present an explicit formula for the average $\NL_{2α}$-norm over all the polynomials of degree exactly $n$ with coefficients in $T$, where $T$ is a finite set of complex numbers, $α$ is a positive integer, and $n\geq0$. In particular, we give a complete answer for the cases of Littlewood polynomials and polynomials of a given height. As a consequence, we derive all the previously known results for this kind of problems, as well as many new results.

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