Concave
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Look up concave or concavity in Wiktionary, the free dictionary. |
Concave means curving in or hollowed inward, as opposed to convex.
Concave may refer to:
Optics
- Concave lens, a lens with concave surfaces
- Concave mirror
Mathematics
- Some authors use the term concave set for a non-convex set, thus as opposite to a convex set. This is not generally acknowledged. A convex set is a subset of an affine space closed under convex combinations; a region where any two points may be joined by a straight line lying entirely within the region.
- Concave function, sometimes called "concave downward" or "convex upward", a function where the line segment between any two points on the graph of the function lies below or on the graph; the negative of a convex function (aka "convex downward" or "concave upwards")
- Concave polygon, a polygon which is not convex
Other uses
- Concave (company), a sports footwear company
See also
- Convex (disambiguation), the opposite of concave
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