Publisher's Synopsis
Excerpt from Multilevel Additive Schwarz Methods
The first property is very natural; it simply says that the restriction of the triangulation T' to subdomain Q5 defines a triangulation for Q] and the finite element problem on Qf is well defined. The second condition is used to establish the upper bound of the spectrum of the additive Schwarz operator. The last condition is used for the lower bound of the spectrum.
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