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Cone
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Wiktionary, the free dictionary.
A cone (from the Greek ?????, Latin conus) is a basic geometrical shape; see

cone (geometry).
Cone may also refer to:

## Contents

## Mathematics

Cone (category theory), a family of morphisms resembling a geometric cone

Cone (formal languages), an abstract family of languages that contains the languages with a regular grammar

Cone (geometry), a three-dimensional geometric shape that tapers smoothly from a flat base to a point called the apex

Cone (linear algebra), a subset of vector space closed under positive scaling

Cone (topology) of a set X, namely the union of all line segments connecting a fixed point to points of X

Conic bundle, an algebraic variety that appears as a solution of a Cartesian equation

Conic constant, a quantity describing conic sections, and is represented by the letter K

Conic section, any curve obtained by cutting a conical surface by an arbitrary plane

Conical combination, a conical sum of a finite number of vectors

Conical coordinates, a three-dimensional orthogonal coordinate system

Conical function, functions which can be expressed in terms of Legendre functions of the first and second kind

Conical surface, generated by a moving line with one fixed point

Convex cone, a subset C of a vector space V is a convex cone if ?x+?y belongs to C, for any positive scalars ?, ?, and any x, y in C

Mapping cone, a construction Cf of topology, analogous to a quotient space

Mapping cone (homological algebra) of a map of chain complexes

Monge cone, a geometrical object associated to a first-order equation

Nilpotent cone, the set of elements that act nilpotently in all representations of a finite-dimensional semisimple Lie algebra

Projective cone, the union of all lines that intersect a projective subspace and an arbitrary subset of some other disjoint subspace

## Engineering and physical science

Antenna blind cone, the volume of space that cannot be scanned by an antenna

Cone algorithm identifies surface particles quickly and accurately for three-dimensional clusters composed of discrete particles

Cone beam reconstruction, a method of X-ray scanning in microtomography

Cone calorimeter, a modern device used to study the fire behavior of small samples of various materials in condensed phase

Cone clutch serves the same purpose as a disk or plate clutch

Cone of depression occurs in an aquifer when groundwater is pumped from a well

Cone penetration test (CPT), an in situ testing method used to determine th...

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