[Minotaur] The supported ampl function

[Jiaxin Liu]

Hi Minotaur Developers,

I am a new user from University of Waterloo. I was trying to model a
non-linear piecewise smooth function, which is essentially a ceiling
function of a smooth decreasing convex function, where the ceiling criteria
is specified by a set of variables. I was trying to use if-then-else, the
piecewise linear program and the maximum function to model my function, but
none is supported (OPINFI, OPPLTERM, OPMAX respectively).  I was wondering
if there is anything I can do in Minotaur to formulate my function, and if
the users are allowed to view the list of unsupported ampl functions.

Thanks,
Jason
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