Dual or Duals may refer to: Dual (mathematics), a notion of paired concepts that mirror one another. Dual (category theory), a formalization of mathematical duality. . . . see more cases in Category:Duality theories. Dual (grammatical number), a grammatical category used in some languages.
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A dual SIM mobile phone is one that holds two SIM cards. Dual SIMs are popular in locations where lower prices apply to calls between clients of the same provider; they also allow separate numbers for personal and business calls on the same handset.
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In geometry, any polyhedron is associated with a second dual figure, where the vertices of one correspond to the faces of the other and the edges between pairs of vertices of one correspond to the edges between pairs of faces of the other.
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In mathematics, a duality, generally speaking, translates concepts, theorems or mathematical structures into other concepts, theorems or structures, in a one-to-one fashion, often (but not always) by means of an involution operation: if the dual of A is B...
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Dual (pronounced /duːˈɑːl/ is a brand name of audio and video electronics. In 1907, brothers Christian and Joseph Steidinger began manufacturing clockwork and gramophone parts in the Black Forest town of St. Georgen.
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Dual (abbreviated DU) is a grammatical number that some languages use in addition to singular and plural. When a noun or pronoun appears in dual form, it is interpreted as referring to precisely two of the entities (objects or persons) identified by the noun or pronoun acting as a single unit or in unison.
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In mathematics, any vector space V has a corresponding dual vector space (or just dual space for short) consisting of all linear functionals on V, together with the vector space structure of pointwise addition and scalar multiplication by constants.
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In the mathematical discipline of graph theory, the dual graph of a plane graph G is a graph that has a vertex for each face of G. The dual graph has an edge whenever two faces of G are separated from each other by an edge, and a self-loop when the same face appears on both sides of an edge.
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