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Complete solution to Schur complement

vlukes requested to merge vlukes/python-mumps:complete_schur_factorization into main

Hi, we would like to use python-mumps in our SfePy project [1] To do this, we are interested in a complete solution of Schur complement method as described in the MUMPS documentation [2] on page 20. Therefore, I have implemented a new SchurContext class which does this task. The schur_complement() function for partial factorization (returning only the Schur matrix) has been rewritten to use SchurContext.

[1] https://sfepy.org

[2] https://mumps-solver.org/doc/userguide_5.7.3.pdf

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