Approximation order from bivariate C1-cubics on a four-directional mesh is full

@article{Lai1994ApproximationOF,
  title={Approximation order from bivariate C1-cubics on a four-directional mesh is full},
  author={Ming-Jun Lai},
  journal={Computer Aided Geometric Design},
  year={1994},
  volume={11},
  pages={215-223}
}
We show that the space of bivariate C 1 piecewise cubic polynomial functions on a four directional mesh of size h has the full approximation order, i.e., O(h 4). 

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