C Hierarchical Riesz Bases of Lagrange Type on Powell–Sabin Triangulations
نویسندگان
چکیده
In this paper we construct C continuous piecewise quadratic hierarchical bases on Powell–Sabin triangulations of arbitrary polygonal domains in R. Our bases are of Lagrange type instead of the usual Hermite type and we prove that they form strongly stable Riesz bases for the Sobolev spaces Hs(Ω) with s ∈ (1, 5 2 ). Especially the case s = 2 is of interest, because we can use the corresponding hierarchical basis for preconditioning fourth order elliptic equations leading to uniformly wellconditioned stiffness matrices. Compared to the hierarchical Riesz bases by Davydov and Stevenson our construction is simpler.
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