Giuseppe,
In amsmath, if we don't want the individual equations numbered, we use the * version. Try:
\documentclass{article} \usepackage{amsmath}
\begin{document}
\begin{gather*} F(x)=\int_0^x f(t)\, dt\\ F'(x)=f(x) \end{gather*}
\end{document}
I hope this helps those who are working on these issues.
In ConTeXt, the usual behavior of such things is to have them unnumbered unless they are preceded by a \placeformula[label], and this is the convention I'm following in the amsl module ... should it be changed?
Not necessarily. You probably should stick with the "Context Way." However, can you tell me how to use the gather environment using amsl so that all equations in the gather environment are numbered and labeled, where each can be referenced separately in the ensuing text? Is this possible?
I'll see for the centering issue.
Definitely. That's the whole point of the gather environment. Otherwise, why not just use align? The whole point is to "gather" a group of equations as a unit and center each on its own line.