Any function 
may be cut into sections where
each section fits into one class:
A model of a function may be built up in pieces.
To determine 
, for 
,
a proper cover 
of m is found.
After a proper cover of m is found,
, 
is concave
and is simpler to evaluate than g.
The union of two linear intervals is a linear interval
which includes the two given intervals:
As before, covers are assembled from a preferred sectioning
, 
.
| Jeff Tupper | March 1996 |