Abstract
The space of piecewise polynomials of smoothness r and degree 3r is considered on the Clough-Tocher split of a triangle. For any \(r\ge 1\) we give a basis of simplex splines for this space, then a Marsden-like identity, which is proved explicitly for \(r\le 3\) and symbolically for \(4 \le r\le 6\). In addition, generalizing results for \(r=1\), we prove for \(r=2,3\) a geometry independent bound for the condition number in the infinity norm of this basis, and conditions to connect two triangles with smoothness r.
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We thank the referees for their extremely thorough and careful review and for pointing out a flaw in the first version of the paper.
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Lyche, T., Merrien, JL., Sauer, T. (2022). Simplex-Splines on the Clough-Tocher Split with Arbitrary Smoothness. In: Manni, C., Speleers, H. (eds) Geometric Challenges in Isogeometric Analysis. Springer INdAM Series, vol 49. Springer, Cham. https://doi.org/10.1007/978-3-030-92313-6_5
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DOI: https://doi.org/10.1007/978-3-030-92313-6_5
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