Definition:Inertia

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Inertia may refer to:

Inertia (Physics)

Inertia is the tendency of a body to maintain the same velocity in the absence of an external force, in accordance with Newton's First Law of Motion.

Equivalently put, inertia is the resistance of a body to a change in its motion.

Inertia is equivalent to mass.

Inertia of Hermitian Matrix

Let $\mathbf H$ be a Hermitian matrix.

The inertia of $\mathbf H$ is an ordered triple of integers comprising:

the number of positive eigenvalues of $\mathbf H$

the number of negative eigenvalues of $\mathbf H$

the number of zero eigenvalues of $\mathbf H$

in that order.

Also see

• Results about inertia can be found here.