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