A type of nonlinear equation that arises in the context of infinite-horizon optimal control problems in continuous or discrete time.
Continuous time algebraic Riccatti equation
Where is an unknown Positive-Definite Matrix
Positive-Definite Matrix
A symmetric matrix with all positive eigenvalues. NOTE: All symmetric matrices have only real eigenvalues
For a matrix, , to be positive-semidefinite the following has to hold
Criterion
Given that is a symmetric real matrix
Can be written generally as
Link to original