Incremental unknowns in three-dimensional stationary problem

@article{Song2007IncrementalUI,
  title={Incremental unknowns in three-dimensional stationary problem},
  author={Lunji Song and Yujiang Wu},
  journal={Numerical Algorithms},
  year={2007},
  volume={46},
  pages={153-171}
}
The main purpose of this work is to set up the explicit matrix framework appropriate to three-dimensional partial differential equations by means of the incremental unknowns method. Multilevel schemes of the incremental unknowns are presented in the three space dimensions, and through numerical experiments, we confirm that the incremental unknowns method is efficient and the hierarchical preconditioning based on the incremental unknowns can be applied in a more general form. 
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