If $a_i$ denotes the $i$th coefficient of the characteristic polynomial $\sum a_ix_i$ of a random matrix $g$ in a Sato-Tate group $G$, then the *probability*
\[
\mathrm{P}[a_i=n]
\]
denotes the measure of the point-mass $n$ in the image $X$ of the continuous map $g\mapsto a_i$ under the pushforward of the normalized Haar mesaure of $G$ to the compact real interval $X$.

This probability is zero unless $n$ is one of a finite set of integers, and it is always a rational number whose denominator divides the order of the component group (if we restrict to a single component and renormalize the measure, the probabiliy is always 0 or 1).

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**Knowl status:**

- Review status: beta
- Last edited by Andrew V. Sutherland on 2016-05-04 03:29:51.383000