In mathematics, the notion of a "concave set" is not correct.[citation needed] A set that is not convex, is a non-convex set.
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Concave — A concave set. The word concave means curving in or hollowed inward, as opposed to convex. The former may be used in reference to: Concave lens, a lens with inward curving (concave) surfaces. Concave polygon, a polygon which is not convex.… … Wikipedia
Set — (s[e^]t), a. 1. Fixed in position; immovable; rigid; as, a set line; a set countenance. [1913 Webster] 2. Firm; unchanging; obstinate; as, set opinions or prejudices. [1913 Webster] 3. Regular; uniform; formal; as, a set discourse; a set battle.… … The Collaborative International Dictionary of English
Set hammer — Set Set (s[e^]t), a. 1. Fixed in position; immovable; rigid; as, a set line; a set countenance. [1913 Webster] 2. Firm; unchanging; obstinate; as, set opinions or prejudices. [1913 Webster] 3. Regular; uniform; formal; as, a set discourse; a set… … The Collaborative International Dictionary of English
Set line — Set Set (s[e^]t), a. 1. Fixed in position; immovable; rigid; as, a set line; a set countenance. [1913 Webster] 2. Firm; unchanging; obstinate; as, set opinions or prejudices. [1913 Webster] 3. Regular; uniform; formal; as, a set discourse; a set… … The Collaborative International Dictionary of English
Set nut — Set Set (s[e^]t), a. 1. Fixed in position; immovable; rigid; as, a set line; a set countenance. [1913 Webster] 2. Firm; unchanging; obstinate; as, set opinions or prejudices. [1913 Webster] 3. Regular; uniform; formal; as, a set discourse; a set… … The Collaborative International Dictionary of English
Set screw — Set Set (s[e^]t), a. 1. Fixed in position; immovable; rigid; as, a set line; a set countenance. [1913 Webster] 2. Firm; unchanging; obstinate; as, set opinions or prejudices. [1913 Webster] 3. Regular; uniform; formal; as, a set discourse; a set… … The Collaborative International Dictionary of English
Set speech — Set Set (s[e^]t), a. 1. Fixed in position; immovable; rigid; as, a set line; a set countenance. [1913 Webster] 2. Firm; unchanging; obstinate; as, set opinions or prejudices. [1913 Webster] 3. Regular; uniform; formal; as, a set discourse; a set… … The Collaborative International Dictionary of English
Concave function — In mathematics, a concave function is the negative of a convex function. A concave function is also synonymously called concave downwards, concave down, convex upwards, convex cap or upper convex. Contents 1 Definition 2 Properties 3 Examples … Wikipedia
Convex set — A convex set … Wikipedia
Convex and concave polygons — An example of a convex polygon: a regular pentagon In geometry, a polygon can be either convex or concave (non convex). Contents 1 Convex polygons … Wikipedia
