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In this example:

- \(R\) is the reference triangle. The following numbering of the subentities of the reference is used:
- \(\mathcal{V}\) is spanned by: \(x y \left(- x - y + 1\right)\)
- \(\mathcal{L}=\{l_0,...,l_{0}\}\)
- Functionals and basis functions:

\(\displaystyle l_{0}:v\mapsto v(\tfrac{1}{3},\tfrac{1}{3})\)

\(\displaystyle \phi_{0} = 27 x y \left(- x - y + 1\right)\)

This DOF is associated with face 0 of the reference element.