Sub Articulo 31.0

I have a lengthy list of equations in a "split" environment, and I would
like to insert a page break to spread the equations over two pages.
According to the LaTeX companion, this can be done using \displaybreak
or \allowdisplaybreaks, but my attempts to use these commands failed.
(In particular, the document inserted a page break after ALL of the
equations, not the equation I specifically targeted.)