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Concave (adjective)
curved like the inner surface of a sphere or bowl
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Concave (adjective)
not convex; having at least one internal angle greater than 180 degrees..
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Concave (adjective)
satisfying the property that all segments connecting two points on the function’s graph lie below the function.
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Concave (adjective)
hollow; empty
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Concave (noun)
A concave surface or curve.
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Concave (noun)
The vault of the sky.
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Concave (noun)
One of the celestial spheres of the Ptolemaic or geocentric model of the world.
“Aristotle makes [Fire] to move to the concave of the Moon. – Thomas Salusbury (1661).”
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Concave (noun)
An element of a curved grid used to separate desirable material from tailings or chaff in mining and harvesting.
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Concave (noun)
An indentation running along the base of a surfboard, intended to increase lift.
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Concave (noun)
An indented area on the top of a skateboard, providing a position for foot placement and increasing board strength.
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Concave (verb)
To render concave, or increase the degree of concavity.
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Convex (adjective)
curved or bowed outward like the outside of a bowl or sphere or circle
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Convex (adjective)
arranged such that for any two points in the set, a straight line between the two points is contained within the set.
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Convex (adjective)
having no internal angles greater than 180 degrees.
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Convex (adjective)
having an epigraph which is a convex set.
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Convex (noun)
Any convex body or surface.