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2 results

Lagrange multipliers for higher order elliptic operators
Carlos Zuppa
Journal:

ESAIM: Mathematical Modelling and Numerical Analysis / Volume 39 / Issue 2 / March 2005

Published online by Cambridge University Press:

15 April 2005, pp. 419-429

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March 2005
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In this paper, the Babuška's theory of Lagrange multipliers is extended to higher order elliptic Dirichlet problems. The resulting variational formulation provides an efficient numerical squeme in meshless methods for the approximation of elliptic problems with essential boundary conditions.

Numerical Study of Two Sparse AMG-methods
Janne Martikainen
Journal:

ESAIM: Mathematical Modelling and Numerical Analysis / Volume 37 / Issue 1 / January 2003

Published online by Cambridge University Press:

15 March 2003, pp. 133-142

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January 2003
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A sparse algebraic multigrid method is studied as a cheap and accurateway to compute approximations of Schur complements of matricesarising from the discretization of some symmetric and positive definitepartial differential operators. The construction of such a multigrid isdiscussed and numerical experiments are used to verify the propertiesof the method.

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2 results

Lagrange multipliers for higher order elliptic operators

Numerical Study of Two Sparse AMG-methods