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Что (кто) такое dual - определение
WIKIMEDIA DISAMBIGUATION PAGE
DUAL; DUAL the film; Dual (disambiguation); Dual (film)
dual
<mathematics> Every field of mathematics has a different
meaning of dual. Loosely, where there is some binary symmetry
of a theory, the image of what you look at normally under this
symmetry is referred to as the dual of your normal things.
In linear algebra for example, for any vector space V, over
a field, F, the vector space of linear maps from V to F is
known as the dual of V. It can be shown that if V is
finite-dimensional, V and its dual are isomorphic (though no
isomorphism between them is any more natural than any other).
There is a natural embedding of any vector space in the dual
of its dual:
V -> V'': v -> (V': w -> wv : F)
(x' is normally written as x with a horizontal bar above it).
I.e. v'' is the linear map, from V' to F, which maps any w to
the scalar obtained by applying w to v. In short, this
double-dual mapping simply exchanges the roles of function and
argument.
It is conventional, when talking about vectors in V, to refer
to the members of V' as covectors.
(1997-03-16)
dual
Dual means having two parts, functions, or aspects.
...his dual role as head of the party and head of state...
Rob may be entitled to dual nationality.
ADJ: ADJ n
Dual
·adj Expressing, or consisting of, the number two; belonging to two; as, the dual number of nouns, ·etc. , in Greek.
Примеры употребления для dual
1. Three have dual Iraqi citizenship, one dual Iranian citizenship and a fifth man, arrested late last year in Iraq, dual Jordanian citizenship.
2. Dual citizenship÷ Article 18 grants every Iraqi the right to dual citizenship.
3. Dual–use capabilities have long been considered proliferation problems, but dual–use capabilities can also be part of the solution.
4. Dual citizenship risks Others say the dual citizenship laws could allow other countries to manipulate Armenian politics.
5. Mind CTI (TASE, Nasdaq÷ MNDO), a dual listed stock, shot up 18 percent, while Magic Software Enterprises (TASE, Nasdaq÷ MGIC), another dual listed stock, rose 7 percent.