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Concave
Introduction
The word concave means curving in or hollowed inward. The term is most commonly used to refer to:
- Concave lens, a lens with inward-curving (concave) surfaces.
- Concave polygon, a polygon which is not convex.
- Concave function, a type of function which is related to convex functions.
- Concave mirror
In addition, the term concave upwards is used for convex functions, and concave downwards for concave functions.
See also
- Convex — the opposite of concave.
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