A Quadratic Form is indefinite if it is less than for some values and greater than for others. The Quadratic Form, written in the form , is indefinite if Eigenvalues of the Matrix are of both signs.

**References**

Gradshteyn, I. S. and Ryzhik, I. M. *Tables of Integrals, Series, and Products, 5th ed.* San Diego, CA:
Academic Press, p. 1106, 1979.

© 1996-9

1999-05-26