the dual number

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• Dual number — For dual grammatical number found in some languages, see Dual (grammatical number). In linear algebra, the dual numbers extend the real numbers by adjoining one new element ε with the property ε2 = 0 (ε is nilpotent). The collection of dual… …   Wikipedia

• Dual (grammatical number) — 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 …   Wikipedia

• Dual — Du al, a. [L. dualis, fr. duo two. See {Two}.] Expressing, or consisting of, the number two; belonging to two; as, the dual number of nouns, etc., in Greek. [1913 Webster] Here you have one half of our dual truth. Tyndall. [1913 Webster] …   The Collaborative International Dictionary of English

• dual — dually, adv. /dooh euhl, dyooh /, adj. 1. of, pertaining to, or noting two. 2. composed or consisting of two people, items, parts, etc., together; twofold; double: dual ownership; dual controls on a plane. 3. having a twofold, or double,… …   Universalium

• dual — du•al [[t]ˈdu əl, ˈdyu [/t]] adj. 1) of, pertaining to, or noting two 2) composed or consisting of two people, items, parts, etc., together; twofold; double: dual ownership[/ex] 3) having a twofold, or double, character or nature 4) gram. of or… …   From formal English to slang

• dual — /ˈdjuəl / (say dyoohuhl) adjective 1. of or relating to two. 2. composed or consisting of two parts; twofold; double: dual ownership; dual controls on a plane. 3. Grammar (in some languages) designating a number category which implies two persons …  

• dual — I. adjective Etymology: Latin dualis, from duo two more at two Date: 1597 1. of grammatical number denoting reference to two 2. a. consisting of two parts or elements or having two like parts ; double b. having a double character or nature • …   New Collegiate Dictionary

• Dual polyhedron — The dual of a cube is an octahedron, shown here with vertices at the cube face centers …   Wikipedia

• Dual quaternion — The set of dual quaternions is an algebra that can be used to represent spatial rigid body displacements.[1] A dual quaternion is an ordered pair of quaternions  = (A, B) and therefore is constructed from eight real parameters. Because rigid… …   Wikipedia

• Dual-use technology — Dual use is a term often used in politics and diplomacy to refer to technology which can be used for both peaceful and military aims. It often refers to the proliferation of nuclear weapons, but that of bioweapons is a major issue as well. The… …   Wikipedia

• Dual language — is a form of education in which students are taught literacy and content in two languages. The majority of dual language programs in the United States teach in English and Spanish, although increasing numbers of programs use a partner language… …   Wikipedia