Dyadics 정의와 표기법

* 표기법 *
vector : bold 형태    or    문자위에 bar 1개 
dyadic : bold 형태 위에 bar  1개  or    문자위에 bar 2개 

예)

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Vectors and dyadics are used, in general, to describe linear transformation within a given orthogonal coordinate system, and they simplify the manipulations of mathmtical relations, compared to using tensors.

For electromagnetic problems, where linear transformations between sources and fields within a given orthogonal coordinate system are often necessary, vectors and dyadics are very convenient to use.

Let us now define the vector A, C, D₁, D₂, and D₃ in a rectangular coordinate system with unit vectors . That is,

 

Let us now write that

 

 or

 

 
where  bar{D} is a dyadic,