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Diagonal matrix

From Encyclopedia of Mathematics
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2020 Mathematics Subject Classification: Primary: 15B [MSN][ZBL]

quasi-scalar matrix

A square matrix in which all entries — with the possible exception of the elements on the main diagonal — are zero.


Comments

I.e. an $(n\times n)$ diagonal matrix over a field $K$ has the form

$$\begin{pmatrix}a_1&0&\cdots&0\\0&a_2&\cdots&0\\\vdots&\vdots&\ddots&\vdots\\0&\cdots&\cdots&a_n\end{pmatrix},$$

where the $a_i$ are elements of $K$.

See also: Defective matrix.

References

How to Cite This Entry:
Quasi-scalar matrix. Encyclopedia of Mathematics. URL: http://encyclopediaofmath.org/index.php?title=Quasi-scalar_matrix&oldid=43066