Dual vs Undefined - What's the difference?

dual | undefined |

is dual.

As an adjective undefined is

lacking a definition or value.

dual

English

*

Adjective

(-)
• Exhibiting duality; characterized by having two (usually equivalent) components.
• Acting as a counterpart.
• Double.
• dual-headed computer
• (grammar) Pertaining to grammatical number (as in singular and plural), referring to two of something, such as a pair of shoes, in the context of the singular', '''plural''' and in some languages, ' trial grammatical number. Modern Arabic displays a dual number, as did Homeric Greek.
• (linear algebra)
• (category theory)
• Derived terms

* duality * dualism

Noun

(en noun)
• Of an item that is one of a pair, the other item in the pair.
• (geometry) Of a regular polyhedron with V'' vertices and ''F'' faces, the regular polyhedron having ''F'' vertices and ''V faces.
• The octahedron is the dual of the cube.
• (grammar) dual number The grammatical number of a noun marking two of something (as in singular, dual, plural), sometimes referring to two of anything (a couple of', ' exactly two of ), or a chirality-marked pair (as in left and right, as with gloves or shoes) or in some languages as a discourse marker, "between you and me". A few languages display trial number.
• (mathematics) Of a vector in an inner product space, the linear functional corresponding to taking the inner product with that vector. The set of all duals is a vector space called the dual space.
• See also

* * unal * duel

* * * ----

undefined

English

Adjective

(wikipedia undefined) (-)
• Lacking a definition or value.
• (mathematics, computing) That does not have a meaning and is thus not assigned an interpretation.
• The result of division by zero is undefined .

* defined