Deflation preconditioner for solving systems of linear equations

References
----------

.. [1] R. A. Nicolaides, Deflation of Conjugate Gradients with applications
       to boundary value problems, SIAM J.  Numer. Anal. 24, 355 (1987).
.. [2] C. Vuik, A. Segal and J.A. Meijerink. An Efficient Preconditioned
       CG Method for the Solution of a Class of Layered Problems with
       Extreme Contrasts in the Coefficients.  J. Comput. Phy, 152:385,
       (1999).

Installation

This package can be installed using pip

pip install git+https://github.com/astudillor/Deflation.git

or adding the package directory route to the PYTHONPATH variable.

License

This software is distributed under the MIT License.