Summary
We define a second-degree nonconforming element on tetrahedra. We build a basis for the opproximation space derived from this element. We prove a discrete regularity property similar to the one that holds for the corresponding two-dimensional element.
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This work was partly supported by NSERC and by the “Ministère de l'Education du Québec”
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Fortin, M. A three-dimensional quadratic nonconforming element. Numer. Math. 46, 269–279 (1985). https://doi.org/10.1007/BF01390424
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DOI: https://doi.org/10.1007/BF01390424