On Thu, 19 Apr 2007, Hans Hagen wrote:
before i add this, we need to be sure that llap/rlap are not used in math constructs which expect it to behave like an hbox
Continuing on the same thread, I found that the above definitions for (c|l|r)lap is not always adequate for math mode. The main problem is that tex does not provide a cramped primitive. The problem has been discussed with a solution proposed by Knuth http://www.ctan.org/tex-archive/digests/tex-implementors/042 and implemented for LaTeX in the mathtools package. Attached is my attempt to port it to ConTeXt. Please look at the \cramped and \crampedclap macros carefully before deciding to include them in the core. I have just copied most of the code from Knuth's definition and do not really understand what is happening here. Aditya