Appendix AConvex Sets. Convex Functions
A.1 Convex Sets
Let 
and 
be two different points in 
. The line crossing 
and 
is given by the set of points 
of the form 
, where 
ranges all the values in 
. In turn, the segment between 
and 
is the set of points 
, where is now restricted to be .
A set is said ...
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