**Identities For A Skew-symmetric Matrix**

In order to compare formulations of the inertia matrix in terms of a product of skew-symmetric matrices and in terms of a tensor formulation, the following identities are useful.

Let be the skew symmetric matrix associated with the position vector **R**=(x, y, z), then the product in the inertia matrix becomes

This product can be computed using the matrix formed by the outer product using the identify

where is the 3x3 identify matrix.

Also notice, that

where *tr* denotes the sum of the diagonal elements of the outer product matrix, known as its trace.

Read more about this topic: Moment Of Inertia, Moment of Inertia Reference Frames

### Other articles related to "identities, matrix":

**Identities For A Skew-symmetric Matrix**

... In order to compare formulations of the parallel axis theorem using

**skew-symmetric**matrices and the tensor formulation, the following

**identities**are useful ... Let be the skew symmetric

**matrix**associated with the position vector R=(x, y, z), then the product in the inertia

**matrix**becomes This product can be computed using the

**matrix**formed ... the sum of the diagonal elements of the outer product

**matrix**, known as its trace ...

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