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Each variant differs from the original method only in the discretization of the right-hand side. Before applying the load functional, a linear operator transforms nonconforming discrete test functions into conforming functions such that stability and consistency are improved. The new variants are thus quasi-optimal with respect to an extension of the energy norm. Furthermore, their quasi-optimality constants are uniformly bounded for shape regular meshes and tend to 1 as the penalty parameter increases.<\/jats:p>","DOI":"10.1137\/17m1151675","type":"journal-article","created":{"date-parts":[[2018,9,25]],"date-time":"2018-09-25T11:14:51Z","timestamp":1537874091000},"page":"2871-2894","source":"Crossref","is-referenced-by-count":24,"title":["Quasi-Optimal Nonconforming Methods for Symmetric Elliptic Problems. 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