Geodesic
A stable and optimal complexity solution method for mixed finite element discretizations
Mathematica Bohemica, Tome 127 (2002) no. 2, pp. 153-161.

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We outline a solution method for mixed finite element discretizations based on dissecting the problem into three separate steps. The first handles the inhomogeneous constraint, the second solves the flux variable from the homogeneous problem, whereas the third step, adjoint to the first, finally gives the Lagrangian multiplier. We concentrate on aspects involved in the first and third step mainly, and advertise a multi-level method that allows for a stable computation of the intermediate and final quantities in optimal computational complexity.
DOI : 10.21136/MB.2002.134167
Classification : 65F05, 65N30, 65N55
Keywords: mixed finite elements; multi-level solver 
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Brandts, Jan; Stevenson, Rob. A stable and optimal complexity solution method for mixed finite element discretizations. Mathematica Bohemica, Tome 127 (2002) no. 2, pp. 153-161. doi : 10.21136/MB.2002.134167. http://geodesic.mathdoc.fr/articles/10.21136/MB.2002.134167/

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