An optimal system and group-invariant solutions of the Cox-Ingersoll-Ross pricing equation

摘要

The valuation partial differential equation of standard European interest rate derivatives in the Cox-Ingersoll-Ross model is analysed. Its one-parameter Lie point symmetries and corresponding group of adjoint representations are obtained. An optimal system of one-dimensional subalgebras is derived and used to construct distinct families of special closed-form solutions of the equation.