## What are the eigenvalues of skew-symmetric matrix?

(b) The eigenvalues of a skew-symmetric matrix are pure imaginary or zero.

### What is an example of skew-symmetric matrix?

A skew-symmetric matrix is a matrix whose transposed form is equal to the negative of that matrix. This is an example of a skew-symmetric matrix: B=[02−20] B = [ 0 2 − 2 0 ]

#### Can skew-symmetric matrix have real eigenvalues?

The eigenvalue of the skew-symmetric matrix is purely imaginary or zero.

**What is the 2 into 2 matrix which is both symmetric and skew-symmetric?**

A matrix which is both symmetric as well as skew-symmetric is a null matrix.

**What is skew-Hermitian matrix with example?**

A skew Hermitian matrix is a square matrix A if and only if its conjugate transpose is equal to its negative. i.e., AH = -A, where AH is the conjugate transpose of A and is obtained by replacing every element in the transpose of A by its conjugate. Example: [i−2+3i2+3i2i] [ i − 2 + 3 i 2 + 3 i 2 i ] .

## Is zero matrix A skew-symmetric matrix?

So if A=0 then A’=0 and -A’=(-1)*0=0=A. So yes zero is a skew symmetric matrix.

### What are symmetric and skew-symmetric matrix with example?

A matrix is symmetric if and only if it is equal to its transpose. All entries above the main diagonal of a symmetric matrix are reflected into equal entries below the diagonal. ■ A matrix is skew-symmetric if and only if it is the opposite of its transpose.

#### What is skew Hermitian matrix with example?

**Is a at skew-symmetric?**

∴ A – AT is a skew-symmetric matrix.

**Which matrix is both symmetric and skew-symmetric matrix?**

zero matrices

Thus, the zero matrices are the only matrix, which is both symmetric and skew-symmetric matrix.

## Why do skew symmetric matrices always have the same eigenvalues?

Since a matrix is similar to its own transpose, they must have the same eigenvalues. It follows that the eigenvalues of a skew-symmetric matrix always come in pairs ±λ (except in the odd-dimensional case where there is an additional unpaired 0 eigenvalue).

### What is the sum of two skew-symmetric matrices?

The sum of two skew-symmetric matrices is skew-symmetric. A scalar multiple of a skew-symmetric matrix is skew-symmetric. The elements on the diagonal of a skew-symmetric matrix are zero, and therefore its trace equals zero. , i.e. the nonzero eigenvalues of a skew-symmetric matrix are non-real.

#### What is the dimension of the space of skew symmetric matrix?

As a result of the first two properties above, the set of all skew-symmetric matrices of a fixed size forms a vector space. The space of n × n {\extstyle n\imes n} skew-symmetric matrices has dimension 1 2 n (n − 1). {\extstyle {\\frac {1} {2}}n (n-1).}

**What is skew symmetry?**

Since this definition is independent of the choice of basis, skew-symmetry is a property that depends only on the linear operator A {\\displaystyle A} and a choice of inner product. 3 × 3 {\\displaystyle 3\imes 3} skew symmetric matrices can be used to represent cross products as matrix multiplications.