A set 
is a called a "convex cone"
if for any 
and any scalars 
and 
, 
.
Convex Cone
See also
Cone, Cone SetExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Convex Cone." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/ConvexCone.html