Definition:Strongly Positive Quadratic Functional

Definition
Let $J \left [ { y } \right ] $ be a quadratic functional $ y $, defined on some normed linear space.

Let the following be true:


 * $ \exists k \in \R_{> 0} : J \left [{y}\right] \ge k \left \vert{ y }\right \vert^2$

Then the quadratic functional $J$ is strongly positive.