Lyapunov's Second Theorem
If all the Eigenvalues of a Real Matrix A have Real Parts, then to anarbitrary negative definite quadratic form 
with 
there corresponds a positivedefinite quadratic form 
such that if one takes
then
and satisfy
References
Gradshteyn, I. S. and Ryzhik, I. M. Tables of Integrals, Series, and Products, 5th ed. San Diego, CA: Academic Press, p. 1122, 1979.
- Yff Points
- Yff Triangles
- y-Intercept
- Yin-Yang
- Young Diagram
- Young Girl-Old Woman Illusion
- Young Inequality
- Young's Integral
- Young Tableau
- Z
- Z-
- Z+
- Z*
- Zag Number
- Zarankiewicz's Conjecture
- Zariski Topology
- Zaslavskii Map
- Zassenhaus-Berlekamp Algorithm
- z-Axis
- z-Distribution
- Zeckendorf Representation
- Zeckendorf's Theorem
- Zeeman's Paradox
- Zeilberger's Algorithm
- Zeisel Number