Large spectrum
= Large spectrum
{title2=$\operatorname{Spec}_\rho(f)$}
For a set $A$ of density $\alpha$ in a finite abelian group,
$$
\operatorname{Spec}_\rho(1_A)=\{\gamma:|\widehat{1_A}(\gamma)|\geq\rho\alpha\}.
$$
= Large spectrum
{title2=$\operatorname{Spec}_\rho(f)$}
For a set $A$ of density $\alpha$ in a finite abelian group,
$$
\operatorname{Spec}_\rho(1_A)=\{\gamma:|\widehat{1_A}(\gamma)|\geq\rho\alpha\}.
$$