Skew-hermitian Matrix

In linear algebra, a square matrix (or more generally, a linear transformation from a complex vector space with a sesquilinear norm to itself) A is said to be skew-Hermitian or antihermitian if its conjugate transpose A* is also its negative. That is, if it satisfies the relation:
A* = −A
or in component form, if A = (ai,j):
a_{i,j} = -\overline{a_{j,i}}
for all i and j.

Examples

For example, the following matrix is skew-Hermitian:
\begin{pmatrix}i & 2 + i \\ -2 + i & 3i \end{pmatrix}

Properties

All entries on the main diagonal of a skew-Hermitian matrix have to be pure imaginary.

See also

 

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