{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2024,2,20]],"date-time":"2024-02-20T22:27:36Z","timestamp":1708468056310},"reference-count":20,"publisher":"Wiley","issue":"5","license":[{"start":{"date-parts":[[2007,2,28]],"date-time":"2007-02-28T00:00:00Z","timestamp":1172620800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Numerical Linear Algebra App"],"published-print":{"date-parts":[[2008,6]]},"abstract":"Abstract<\/jats:title>This paper analyses a two\u2010level preconditioning scheme for H<\/jats:bold>(curl) bilinear forms. The scheme utilizes an auxiliary problem on a related mesh that is more amenable for constructing optimal order multigrid methods. More specifically, we analyse the case when the auxiliary mesh only approximately covers the original domain. The latter assumption is important since it allows for easy construction of nested multilevel spaces on regular auxiliary meshes. Numerical experiments in both two and three space dimensions illustrate the optimal performance of the method. 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