Concave or concavity may refer to:
Science and technology
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Concave lens
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Concave mirror
A curved mirror is a mirror with a curved reflecting surface. The surface may be either ''convex'' (bulging outward) or ''concave'' (recessed inward). Most curved mirrors have surfaces that are shaped like part of a sphere, but other shapes are ...
Mathematics
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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.
Definition
A real-valued function f on an in ...
, the negative of a convex function
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Concave polygon, a polygon which is not convex
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Concave set
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concavity of a function, determined by its second derivative
See also
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{{disambiguation, math