Definition:Orthogonal (Linear Algebra)

Definition
Let $\left({V, \left\langle {\cdot} \right\rangle}\right)$ be an inner product space.

Let $u, v \in V$.

Then $u$ and $v$ are orthogonal iff:
 * $\left\langle{ u, v }\right\rangle = 0$

Also see

 * Definition:Orthonormal (Linear Algebra)