These terms describe polygons. To identify a polygon as convex, we draw a segment from any vertex to any other vertex. This segment cannot go outside of the polygon.
Non-convex is concave. If we draw a segment from a vertex to any other vertex, at least one of the segments will go outside of the polygon.
A triangle is normally nonconvex on a flat surface
Not necessarily.
Aleksandr Moiseevich Rubinov has written: 'Abstract convexity and global optimization' -- subject(s): Convex programming, Mathematical optimization 'Lagrange-type functions in constrained non-convex optimization' -- subject(s): Lagrangian functions, Nonconvex programming
A nonconvex polygon is a concave polygon. All polygons with 4 or more sides can be concave. An arrowhead is an example of a concave quadrilateral. The back of an envelop (where the sides are folded and glued together) is a concave pentagon.
None. They either consist of curved sides or are not closed shapes (have lines "sticking out").
a polygon is convex
A non convex is a concave and a convex is differently shaped
projector have concave or convex
the union of two convex sets need not be a convex set.
convex
Convex ~
The lens of the eye is biconvex (convex on both sides).