In a ray diagram, a concave lens is drawn as a vertical line with inward facing arrows to indicate the shape of the lens.

In a ray diagram, a concave lens is drawn as a vertical line with inward facing arrows to indicate the shape of the lens.

Vector illustration of concave and convex lenses isolated on a white background. Difference between glass eye lens, physics. Converging and diverging lens. biconcave and biconvex lens. Red radiation ...

Abstract: In this paper we introduce disciplined convex-concave programming (DCCP), which combines the ideas of disciplined convex programming (DCP) with convex-concave programming (CCP).

Critical capital stock in a continuous-time growth model with a convex-concave production function – Ken-Ichi Akao, Takashi Kamihigashi, Kazuo Nishimura A nonconcave growth model may exhibit multiple ...