A simple analytic formula for the spectral radius of matrix continuous refinement operators is established. On the space L2 (R),m â‰¥ 1 and s â‰¥ 1, their spectral radius is equal to the maximalâ€¦ (More)

We develop a Hermite interpolation scheme and prove error bounds for C bivariate piecewise polynomial spaces of Argyris type vanishing on the boundary of curved domains enclosed by piecewise conics.

We present a construction of nested spaces of C2 macro-elements of degree 5 on triangulations of a polygonal domain obtained by uniform refinements of an initial triangulation and a Powell-Sabin-12â€¦ (More)