It is my understanding that \abovedisplayskip and \belowdisplayskip should
adjust how much (rubber) spacing that is allowed between display math
formulas.  I have attached a ConTeXt file (bug.tex) that seems to indicate
that setting these skips does not affect this (rubber) spacing.  I have
also translated this ConTeXt file line-by-line to a LaTeX file (bug.ltx)
and attached it.

Both files produce a PDF (using `context bug.tex` and `pdflatex bug.ltx`)
in which the spacing between the formula changes from page 1 to page 2
simply by adding the final formula.  However, by changing \adjustdisplay{0}
to \adjustdisplay{1}, the LaTeX file produces a 3 page document where the
spacing between formula does not change (as expected) on the first two
pages and thus requires a third page to typeset the final formula.
However, making this same adjustment in the ConTeXt file does not seem to
affect the output.

I would appreciate any thoughts as to why this is happening, and I would
equally appreciate a solution to keeping the spacing the same in the
ConTeXt file and thus bumping that last formula to a third page.

Troy Henderson